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28058 PE-1751A Midilome 2nd Addition 1998, 10-23 Stormwater Drainage Report 40 - . . . • . . ST(7RMWA'IER DRATNEI+GE REPORT and Road4vay DesiQn MID[LOME EAST 2nd ADDITION October 23, 1998 Prepared by: Sunpson Engineers, Tnc. North 909 Argonne Raad Spokane, VVashin-64on 992] ? . The desigi improvcments shn►vn in this sct Qf,plans canform to ✓ the applicabte editions of the Spokane Gaunty standards for rcaa.d and sewer cr3nstruction and Spolcane Gaunty guidehnes for ' starmwater mariagemenc. All design dm'ations have becn approued by tIie 5pokane GQUnty Engin@er. Tapprove these plans for r,anstructifln . C1FFiCIAL PUB4.iC DOCNENT TABLE QF CQNTENTS sPOK"E cOu~aY ENGiNEER's OFFECE ~ OR i G V ~ ~ ~~~T A P~ r. DTainage sumunary suBMIrAL 9 ~ as. - U~# T~? C~iJJ ~N'GB~L~ Typical Curb xnlet an~i Driveway~ Cut Calctilatians (additional calculations with Basins) ~ Startaiwater Dra'mage Calctiilations far Nfidi3ome East ?nd Addition. ' Basins A thraugh M. TIi. Atta+chtnent5: * S.C.S. sails map, and sail description * Roadway Surfacing Desi~ Siaht Uistance Anatys~s anti Niaps tor ~ -VercIer Dnve, 35th Avenue, and 36th Aveiiiie 28578 ~AL ~ F-XP C7ATE 10f4/7-00V ~ i Stvrrnwater Drainage Repart: Iifidilome East 2nd Addition DRAIlNAGE SUM?VL-kRY: This project is lvcated svuth af32nd Avenue and east afPines Raad. The pIat propnses 37 residential lots tataling aPproximately 17 acres. The develv~ment is divided intv thirteen (13) basins, A through M See Drainage Map fvr Midilvme East Znd Additivn Each basin is compased of twv subareas; i) grass 1av+ms and swales, and 2} irnperviaus ravfs, driveways, and asphalt paved streets. Stormvvater flows overiand acrass rovfs, grass tawns, and driveways and into grass swales behind the street curbs. 5tormwater ftom asphalt streets flaws along the curb gutters and inta the grass swales through driveway c'ut$ cuts and curb vpenings located at 1ow pvints in the curb profile. As specified in the "Cruidelines for Stvrmwater Management", page 5-4, where a slvping svvale is iess than 100 feet lang, and slapes 1% or less, Che swale may be cansidered flat. Drivevvays aIong the road will ahstruct the swates, creating a series of individual swales that are less than 100 feet lvng and less than 1.0°/o, and binches , deep between tlne driveways. Therefore, each swale will be considered as flat. 5tortnwater wilP fill each swale ta a6 inch depfih and then pverflvw acrvss each driveway until the water reaches the fina1 swaPe arid dryweil(s), The gY'ass swales were calculated ta hvid the first 112° of rainfall run4ff oVer the asphalt street areas. Figure 2, page 6-3, of the "Guidelines fvr Starmwater Managernent", by Spvkane County Engineer5, was used , for rainf'fall intensity and durativn Qccurring at a 10-year storm frequency. The Ratnanal and Sowstring NTethads were used to calculate the peak stormwater runvff for each basFn, and the , type and number of dryyvells needed for each basin based on the storage capacity ofthe swale Tn acevrdance with "Svil 5urvey, Spokane CountY, VVashixagton", 1968, the soids at the site are categvrized as: ' GrnB, Garrison very gradelly loarty,... sinailar to Garrison gravelly loam, except that the surface layer is very gravefly. SxB, Springdale gravelly sandy loam, deep,.. sirnilar to Springdale gravelly lvam, except that the depth to gravel and cvarse sand is mvre than 36 inches. These types of sail are cvnsidered acceptahle far dryvvell instailatian per 5ection 4-4.1 of "Guidelines for Stcrrmwater Management". - ` 5tormwater I]raenage Report: Nlidilame East 2nd Additian a CURB INLET Afi3D DRNEWAY CUT CALCULA,TIQNS. 1) Far each 6asin, calculations have been made far the curb anlet lacated at a 1aw pvint Each cucb inlet located at a low pvint i5 sized tv accept the flvw of stvrmwater frvm tfie cvntributing pavement subbasin. ` 2) Tn Si7Pt"t$ GaSeS, additivnal curb irlets are r+equired vn continuvus grades. For exammple, additivna[ curb irlets wiIT intercept the stormwatez an cvntinuous graoes along VercYer DriVe. Runoff calculations haue `been made fvr the pavement area in these subbasins. 3) I}riveway cuts vn cvntinuous grades will intercept the stormwater flvrav in each pavement subbasin prior to the curb inlet at the low point. A typica~ calculataQn has been made for a driaeway cut for the pavement in subbasin H4, s3.nce this subbasin has tne Iargest pavement area of any subbasin in the pIat, it wrill have the 1argest peak flov►r of any subbasin. A driWeway cut of 11.35 feet is required for this subbasin, but is less than the typical driveway cut vf 24 feet. SiilCCy the runaff will be less in al1 other pavement subbasins, drivevvay cuts fvr the other subbasins will be sufficiently rvide (24 ft.) to intercept , the storrnwater in the corresponding subbasins. Drivewav Onenina on Continuous Grade, Exa,pnple: Subbasin H4 a = 0 in. Flawline depressian at opening : Y= d.(}$ ft. Depth vf flow in nvrmal gut4er Q = 0.21 cfs Design discharge Qa/La = a.0185 From Fig I6{a}, Fage 6-39 "Spvkane County Guidelines for Starnnwater Manag,ement" L='Qf(QaII-a) = 0.2110 0185 = 11. 3 5 ft. Driveway [3pening; 24 ft. wide, 5 in. deep O~C{AY ' E I F ~ > - RATfONAL Ft]RMLlIA HYDRC)LQGY QRAfNAGE BA51N HIVA4..Y5i5 fvr 94 YE1R 5'ii'[lRM E1fE3+IT - Date' 9f23198 Praject Afame Midilome East 2nd Addthon Qesign: kwm Pmjed Number. 128638 orsk F,[e nl vaWnan1rn1283ajdS 5ite Locabon N 1C2, S 34, T. 25 N., R. 44 E iN M Basin Name' "1-14" 8asin Descnphon Vrgirna Roac1 Pvint af GoncedstraUon. Qrrvewray E I SUBRREAS: , lnterssitY-Duratian for 10-year Stnrm Event _ Descrsptzvn 1lcres C A'C iime Time Iratenstty Incrrnnt lncrmnt PaVemerrt 0072 090 0.065 [mm ] (sec.) [inJhr) i9116M 5 07 3010D 318 5 300 318 , 10 600 2.24 15 900 -1.77 2{} 12DO 1.45 • 25 150I3 1.21 3[] 1$00 104 Total E4asin Anea, aeres = 0072 35 2100 0.91 Gvmposite Runaff Coefficaer`t = fl•900 40 2400 a.82 Com6ined (Area' Rursoff Coefficienf) = (1065 45 Z700 0'74 50 3OW 068 55 330[] 064 60 3Ef10 0,61 T1ME OF C[]NCENTRATlON [mirnates). 65 3900 0•60 70 4200 0 58 , TG {orrerfandRow) Tc (gutterf3ow) 75 4500 0.55 80 480t} 4.53 Ct = 015 L2 = 155 85 5100 0.52 Zt = 36 90 5400 0.50 L1(,a) _ 18 r.z = 0167 95 5700 0.49 N(A) = 0.016 8 = o t[ro 6DOO 0.48 S(A) = 00278 n r 0.016 s = 00184 Tc (17) = 021 d = 0087 L1 (B) _ ❑ Tc (gut) 169 y(g) ~ 0 Tc(A+B) 0 21 5(B) _ 0 Tc totai 5 00 iniensrly : 318 PEAlC DISCHARGE, 10 YEAR STDRM: Tc (B) = 00 hiolding 5.52 Q=C• I• p= 0.21 C.F.S. Q(estimated C d) = 0 21 c f.s. Time ef Concentratiori = 5 00 minutes i H, D~~TH OF FLf-y - FEET .o~ aa as 04 .os ~06 o.~s .fn x .s 4 .S 8.7 .9 .9 1.0 1.0 - - ~ -7- . I ~ I I e Tr . t ~ ~T I .s itT, Vif , ~ 1 f, ~ I[ ~~I 6 +f t d~! ~I .2 ~ LQ I ilI i :I .09 ~ ~T~ ?r ~ r~ • . i i F ~L .as .os °a pppp 03 • ~ 4 I i~ ~ I~~ ! f 1 1 ~ 1~~ I~ l 01 § ! { ~.o . e ~ ! ! I (o) C]iSCHARGE PER FO{~T QF y ~ s ~.Er~GTH oFcURB oPENI~vc --~---~-~a 34 , INLETS wHEru INTERCEPTZNG 100°o OF GLITTER FL(3W (b) PART1AL [NTERCEPTIQ ~ ~ I ~ y~.3 '4O R TIO FOR ItVL~ETS d LENGTH LESS THAN L.d ~ I , ~ , ~ ~ ~ ° • a /001 ~ ~ti• ~~.._t~.,l ~ r~~~q ~ I ~ i~ I f Of 6 I ~ - ~ " ~ ~~-~---J°--~ ~ • i e .08 .10 Z 3 .4 .3 .6 9 10 L1L,a caPACITV oF cURB ORENPHG INLErs ON CONTiNUaIJS GRADE 6-35 F1GURE 16 - 2.~' #,DD ►-T L'QN µc. 17-S38 it w M . VFMN)~Gs C.ALc-Ul. AST lONS t ~~stvt A P, -VaTA L z ~ 51-Z .69'}( 55` l~8 r{ ~ n- 0,6133 PAvrt. ~ V'~rcter 1]riv~, ~ zo jo 3zim.61 fi.?- " ~ I ~ ID 1?-l14 sS ~ .5 ~R~V~~ ~ 1 ~t7D F'C. _ ~~P ~T.~ .v ~ c~le~`~ p R~~1 s go aF o f ~ 1r~~ SfLN M Q 5 9, Z.'LS + S ~ t~ o'D t Ip fT•' ~ D.3~~°~ acre GZ%9 l9 $ 14r i 131 ~1~~] F ~ s lt4. f, 1~ 1~ ~ . 351 3 + ( t~.3 ~-~s rsu+) - ~vJcLk e~ FT•~ ~ ~$5 54& FC3 > -35-7 ' t MVDlLvM~ Eok5T Z"l) ADDt7Iat4 No. 12-838 ~e' \'+M U?-AINFrGE. CALcULATtvNS SwALS , F7I~S~N P~v~M~t~ ~ A~~PS -1 07AGs S-rOR,AGS ~.~f,11J1~~i7 AV A, l4. P1B LE ~ C) f:T.' 0 rT FT. u- t.ovi Yt.4 p,,~ ~~~~'~C►~`) ~ ~~.z i~~ ~s~`}~~,~~ ~~Z~ ~ 1~~ F-T.: $ A 3 (gs')( Is') = ,,s.3 a f T,$ ~ ~ ~ T.' ~7.. 0 k' cl _ FT 3 FT ` 3~ IF 1.'" Frt~ {r i~ ~ e•98 F~a~ ~ k-zo F-T. ~ FT,~ ~iZ34 ( • ; N1~O1l.Ot~lE ~AS? 2~D ADD~t1oN \2-~3~ DRAINA6E CALCU~ATIONS - ~ ~/w - - - ~ - - - - - - - . . l3~ • - ~aS~rneh'~. . . . . . . E = - - - ~ p►- - - ~ ~ ' I 5.5~ . - - I . s ~ • - - -Coe o~ ~r;v eway - - - - - - - ~I O.OIlo'1 C S• /F'`. a. . ~ i - . ~ , , . . . . . . ~ . , . . . . ~ . . - ~.11~~ F T.'/ FT,'.i~~~ ~ ~I • ~ FS-~F~~- , Z- - . y'_; . '13 5 oP ~Normo~l SWale_S~oPe N.orrna\ a1e. Corc. C..►rb . . . - Swa1e. Bo}tow► Cross- Sec-~.iov►Al. Area 5.~Nale _..lo , _ -t-a-~-- - 3.~4) - ;.n $ FT? . . -T,~ C~. ~C. _ z~C - - . . ~ - - ~ • 4.29~ 3_GS / I.o1 0-91 . 0 . Y~/~` . . _ . _ , . ~ F a 6 ~ ~ - • r/~~ 0 ~ • n~.~ _ _ . . r ^,y. . I - ~ R/w ~ . - - - - . 13 ~ a s e_vn e"t. . - : I - - . . _ ~p'.. - - - • - ~ 5.5~ , 1.5~ - - -[oP of DrivewAy - ' - 4, ` ` ~ ~ I' -c•' lp ~ 0.0 ~(o7 - a . / • o \ ' ~ . l ' a - _ . ' • a . o ~ r s . - . . • • ♦ , ~ 1 l ~ • X a • ~ Q \ • • •I~l~.'~,~~ ~/!/,~('I_ . . o• ll~~ FT. - ~~,r~~~~~`ti``Il/~•y~1.YJJ_l~~'1~~y~hY~~ti ~ ~r► ~ I~,c. , , Nor.mq~ ~ ..~Fr.._. . . . . . . .p ti~~ ~ - k- Cohc. "Wqle SIoPe SwAte- Boztow►_~ C.~.rb . . . - - - - ' " r Cross - SzC--t►oV\ a 1 Area crt SW a1z -4~ - ~ 4.29 pO 1.93 z~~0.5~ 4.29~ ~ 0,5 1.93~ -k' p.5~ 4.~~ Z.oo ' - \,o~ 0.4b ~ . . . . _ • - _ - . _ -i~ • - - - - • ~ • l r_T /F \ ~ J.JJ F ~ : 1-9 - • • _ • - • T p. _ A• . . _ _ _ I L t DETF-h1T1C31d 13AS1N DESfGiV. RAT1C)iNAL FORh+E[SUk FC'r'DRC3LOGY 8 BC}W5xFt1[VG MET41i7D ❑RWFJAGE BASIN ANALYSIS for 10 YEAR 5TC7RM EVEN7 i7abe. 811 SI98 Pmject Name N{Idi[ame East 2nd Addrden Job No.: 12838 Rsaseet Locahon: N 11Z. S. 34. T25 dV , R 44 E. W.M. Deugner K. MCIk+iUt.KIN 47rairage 9:asin Naiesa. "A" Disk du.. R'6.Ibovvstring ❑rainage Basin Oescnphon. Onsite Filename. 12838sds '208"PandingArea Alame• s►vaie For Temlinsnn panding Area Lwcaton' west srde af Vercler Qrsvs PoErtt of Cenaerjtraativn. low Pt., 31 +00, Lt. SlfBARER5 T1NiE OF CQIVCENTRATION (1`c). minutes [7ascdqtiran Rcres C A'C Overfand Fsav+ C!►ansEel Row d lmneryio,Lp `708'Are3aa: ~%grrFerrtA: L2= Asyhaft Paw~mer~t 0.212 ~i ~V 0.191 Ct= ~1 SS Z7 = 3873 Roafs 4000 090 0.000 L1 [A) = 0 t2 = 8.6 Drivevrels 0.114 090 4103 PI(A] = 0.4 8= 0 Grass Lawn 0321 0.15 8.048 5(A) _ 0.01 n a 0.03 Tc (A) _ gm0 s = 0.909 OtherArees- d = 0,317 swq-&'3` L7(B)- 0 Tc {ch } 4,63 N(B) = a Tc(At6) = 000 S(B) = Q Tc bow 5.00 7cta6 Bamn Pirea, acres = Tc (B) = 0.0 Irtensify = 3 18 0.647 , Gom€osita Runafi Caeff€cient = 0 53 , Combitted {frea ' Runaff Coeiftcient} = 4} 342 C] (es9matef t~ d) c3 1.09 c.f.s Time uf £ancer►trairan a 5 00 minutes "208' flRAINAGE PARAMETEfi3 '208` PavementArea = 5128 sq ft, P'F141f DISCFfARQE, iQ YFrAR STOR[41 *M' Valurrts Prannded 0 54$ eu, ft at fi' depth 5bm &tarage Pravided = 548 cu. R, af 8" dePth Q= C' t' A= 1.09 C.F.S. 8M5TRIf3G CALCULAlIOMS 02 45 A & iti PSUM9ER and TYPE of 'QRYWEl.4 + PROPQSED . rme 1 zme 3nterestty G] d9v V in V out Siarag8 Intrmrrt. IrtumnL 1 5ingis-Barrei (sfxokane Caw+ty Type A) {min ) isK.] (inJhr) [cTs) {cu it] [eu. ft.) (cu ft.) 0 Oau6la-Barre9 (Spoirane Caunty T3rpe 6) {#t-~ {n•G'#3} toutl.'~FZp {As4i} s ;~-f$ t fR~ a'37 ~ :s~i Outllow Rravided: 03 c! s 5 30$ 37a~ 1-m a'3'i 90 jaT 14 6013 224 4 77 537 180 357 15 900 177 0.160 606 270 336 20 1200 1 45 1730 64.5 36(] 285 25 isaa 1.21 0.41 662 asa 212 -208-rReaTMErar VQLv►~E 30 T 8QQ 1.04 036 876 '545 136 36 21 0Ch 0.97 4,31 GSv 83{} 65 Required G PA- ponding erctunte 48 2400 U.82 028 701 720 -18 Zmpervious "208' Area x TIT = 385 ea. fk 45 2700 0.74 0.25 709 810 -101 valume provKied a! E' dePth = 548 cxu. ft. 50 3000 4&S 0_23 721 90D -779 dK4 55 33W 0.64 022 744 990 -246 60 3500 0.81 4.21 772 iflw -308 65 39M 0 60 8.21 821 117(} -349 70 4200 0.58 020 853 1260 -407 75 4500 0.56 919 $91 1356 -469 $Tf7RM uTORAGE VOLUiNE 8U 4800 0 53 018 888 1440 S52, - ~ 85 5"FOD 0.52 ~11$ 924 1530 -508 Msmmum sLeraga reyuir4d a 357 cu. ft/ 90 5400 050 017 5~4[1 1£2{! ~80 vafurrte pro~nded at 8' dep~ = 54$ cu 95 5700 449 4.17 972 1734 •738 OKe 100 e000 0A8 016 1001 1800 .iss 5'[mpseuf Fgineem, fnc. 949 Afarth R►gwrne Road, 5pd[srte, WA 99212 (5(i9) 826-133t ln.m . c Stormwater Z]rainage Report 11, STQRMWATER DRAIINAGE CALCLFLATIQNS I3$sin A - Curb C7t)enina at Low Point, Sta. 3I+00, Ieft, Vercler Drive Gucb Inlet #1 h_$ in. = 0.67 ft. Total height ca~operunz H = 4.055 ft. DepCh of wa#er at entranw Q =0 47 cfs Total peak Xate af flaw Q= 3 487('L,)(IW'2 for H/h < 1, Oa065f{].67 =0.097 < I L = Q = (3.087)(H)' = 0 07 - (3 087)(0.065)312 _ 1 37 ft. - Ganstruct Ctarb C3pening, 3 ft. wide, 8 in deeg RATIarAL FaRMuLa HvoROLaGr DRAINWGE BRSIN ANALY515 far 10 YEAR STORM EVENT Dafe 9115ss Project Name. Midilorrne Eas# 2nd Addibsrn Desiyn: kwTn Project Number 128~ Dtsk Fpie ny G2fM3n10%12assJd5 Sde Lcscafivn. N 1i2, S. 34, T. 25 N., R 44 E. W.M Basin A1ame. "A" Basin [lescrsptivn Vefdee 8rne Point of Cmncentratic;n: Sta 31+00, 98' LeR , SLiBAREAa: 2nterisityr-Duration for t0-Year Stvrm Everat Descrtptivn Acres C A'C Time Tme Intensity Inarmnt, fncrmnt Pavement 0.025 090 0.023 (min.) {sec} (in.fir) [M'Ba) 5 00 3D0.00 318 5 300 3.18 10 60D 224 15 900 1.77 21) 1200 1.45 25 150(3 1.21 30 1800 1.04 TotaI Basin Area. acres = 0.025 35 2100 4.94' ComposAe Ruroff Coeffi~ = 0.9t7o 40 240[] 0.82 cambined {Area •Runaff c~~ent) = 0023 as 2700 0.74 so 30DO 0Z8 5s 3300 a.6a 60 3600 0.61 TIME OF COIVCENTRATION dminute.sl: 65 3900 0.60 70 420t1 4.58 To (overfand flow) Tc (gut#er flow) 75 4500 056 80 4&)Q 0.53 C! = 0.15 L2 ~ 31 85 5100 0 52 Z1 = 36 90 5400 050 L1 (A) = 1 B 72 = 0467 95 5700 449 N(A) = 0016 B= Q 100 6000 048 $(A) = C? i}278 n = 0016 s = 0.01 Tc {A} = 0.21 d = Q.OfiS L7 (B) = 0 Tc (gut ) 056 N(S) = 0 Tc{A+B} = 021 8(B) = 0 TC tvtal 5.00 Iniensity = 318 PEAK C1iSCt1ARGE, 10 YEAR STORNl: Te (B) _ 0,0 F{o3ding 1.10 Q=C•F""A= 0.07 C.F.B. Q (eshmated @ d) - o.07 c.f s. Timie of Canceniration = 5.00 minutes A _ • ~~~3 ~ lAL D l L.aMS $ - - RfMA~G S CA LC.u LATiQNS ~wm 314 St N ~ I o'T AL 51-1 500 g Y~rcler 3z#3?-.G1 35T" (D taD ~ $46.W acrp- D~tivr=S ~ 1i~vU _ '~~~U~ n. ~.~}~l~" ,qC+r~ DIZIY E C ZoDDa FTz ~ +,000 1s aCre. H~v s ~ ~ ~~'►P~~~rous ~ 2 ~r jtivv v 4 41DvO 0.$-713 aere Sf, Soa 533 m •l~ r . ~4v~ v~1rtv►~ ~ ~ €75 ~ ~ ~ ~ ~v►9l~ '~'ar~r~l We.l~ S~agA~E p~au`pEV: 5vlowle5 : 91 2 F"C3 Cl '12. t.~ . 3 7 -705 1Z83 8 M1Dll.oMS 'EAS-r 2mD ADptTl-Orl s/2z'qg pCZAIN A6E CALCU L A'f iorl ~ KW M „ Zo8SWALE B A 5(N PA~ EMENZ AR~A ~ S-r oRA(S E STogAG E ~ t2EWu1RED AvAt L AaLS ' 100 I /k 7 Y~ g t ~2G4.5~)~l8 '1 16l Fz?1 3Z4 Fzt ~ is~ i(3.55 fSi}ti 46o F~.` (1611)OV) _ (k-9s Fzz) ti k Io ~ $ Z (\oo' ) (~8') = ►,Soo ~Tt ~5 F-~? ~6z ) ~ t.q8 FT~) t23~ FT3 ° - - - • _ .r : v~ B 3 (ll2)(l$~~ = Ziol(o F-T~'; ~g' fT? ~73~~ ~ I•`~8 FSz~ 145 f T,g d f ~ . A 3 g~, (6b')(18'~= 1,zz4 FT''; 5t ~Ti (T8` )(1 .9 8 f T?)~- Is4 FT" 0 ~ ~ 5 ~ T. 0 ~Z3 ~ F7i) ~ ~ IZ,S oI fTt 534 Ft.3 9~2 ~~a - ~ ~ ~+/lDtLDtv1S A5`r 2.'~° ~DD 1-f t vN 12 S38 DP, RN ACS C ALCU I.ATtvNS ' ; - - - - . . - ~fW - ~ - - - _ _ - _ ~o~-- `Tv'? of Dr%veway . . - r~ 3 . l7t, ~ • - ~ O.al~~ rT•A'F'~• ~ . . ~ R a . . . ~ . ~ a ~ ~ Y ~ ~ y •FT.~FT. 3 V"al. _ . Cor•c. C ~rb - - Swale ~v~tv+rfn V-.cz. - ~ 4 ?.gOD 3_~5 ~ O-C4l - • • IA~~ ~ `9 • + ~ - _ • " 1 r,- - yrne.--7! - ; ~ - - -Tnl? af Drivewav~ _ 03~~ ti' - • f • ~ r a L • ' - , • _ . - . ~ i . ~s~~ ~ a . < < r F~ r ~ v I t ~ 7 iz T• N ar ' _ - - rs7~Q! ~ IFT.-- _ - - - .p?.5°k ~ ~oY~~, - " " _ lD' J 8.5~ ~ - - - e•- - - - - . /~1C~ae G ~W a1 CC DS 5 r - ~~C~iti4r►q~ ~ i - - - - ,F ~ l.~ - • - $.z.g °oT 1.9 3) t_ ~_~p~ ~ .4 ~„h ~ - , ° • _ • ti F r'~ ~ - - • • - - _ - • - - • - - 3•515 a•._~•- - `y' $ DETENI'IQN 8A5[IV DESIGiV RA7'ff3NA1 FflRMULA HYDRCSLOGY 8 BOVYSTRING 111[EThEOa DRA[NAGE BA&IN AlVALY515 [or 10 YEAR 5T4RhA EVEtJI" ' p~. 9rz/sg Project Name Midilome EasY 2nd Addrdan ,lah No. 12838 Praject Laa6on• YV 112, S. 34, T. 25 M, R. 44 E. W M. C3esigner K. RRCMLfLKIN Oramaga 6asin Name• "B.. Disk Cir., Ai:lbawstnng Drairzage Basm OescnpSian- Onsda Fiianame. 12838-,ds "208' Pondmg Area Nama: s►vaie Fvr Fomlmson Pondurg Area iocabnn east side pt Vgreler Clririe Pairtt o! Concentraharr Lrnv Pk. 31+0[]. Rt. &L3BAREAS TIME qF C6IYCENTRATIC)N Cfc'ir mmutss Oesenption A,cres C A'G averland Flow Channef Flow lmoerytay.s `208• Areas• 5earr~er~4; L2 = 550 Asphaft Pavement 41_294 090 8264 Ct = 0.15 Z1 = 73 Rooft 0092 0.90 a.cjas Ll (A) = o zz = s.s ❑raverrays O.DSQ 090 0083 N(A) = 04 6$ 0 Grass Lawm 0 774 0.15 0.116 5(A) = 0 01 n= 003 Tc (A) = 0.00 s = 0.012 iQtherArees• d c 4.355 @gqx►~P L1 (8) II 0 Tc [aFt } 5 39 , N[B] _ 0 Tc{A+8} = 0.00 SO ° a 7c talal 5 89 ; Tc (B)= 0.0 Irttensdy = 3.1 1 Tctal 8asin lirea, acres = 1251 Camposde Runoff CoefFtten! = 044 Garrshined (Araa ' Runofl Caefftcient) - 0.'S48 Q(estimated d) = 1 70 6 f.s Ttme af Ccmcerrtra4nn = 5 39 mtnutes '7W []RAlMfAGE PARAFA£TERS "208" PavementArea = 12797 sq+ it PEA1( DISCHARt'iE. 10 YEAR STORM "20$' Wrlume Proinded = 9$2 cu. ft at 6" depth ftrrn 5iarage Rrovwied = 992 cu 8. at S' detth Q= C' A= 1.70 C.F.S. 60WSTRING CAtCUL4TIRNS A A ;i7 40 47`a NLJME3ER and TYPE oF DRYWELW PRDPOSEQ Tme rme frrbenssty ❑ dev V in V out 56oraga Ircrmnt. Inarmrrt. 1 Sir€9te-Barteff (Spnk-a- GourAy Type A) (min.) tsec y (in.lhr} (cfis) [cu R.) (cu. R) (cu. ft.] 0 Daubls-Barrel (Spalmne CauntY TYPe B) {~1'B6i}} [A'C {putf'#2] 03.w s'~3~s'~ 1 ~ I3G -zm fi.3T (]utflow PrDVlded: 0.3 c.# s. ~ a iDo 1718 7.i a 696 ya r~ 10 600 2.24 1.22 860 tso sss ' 15 900 177 427 975 270 705 20 1206 145 0.79 1038 360 676 25 1540 121 066 1063 450 613 '20B'7REATMENT Vi}LUME 30 18U0 104 0_57 1Q84 540 544 35 27I70 091 050 1097 630 4$7 RCquired G FA_ ponchng volume. dq 2400 0 82 045 1123 720 403 Imperv[ous "208' Area x 10 = 533 cu ft. 45 2700 6 74 040 1135 810 325 va[ume pwdel at depth = 992 cu R. 50 3000 0.s8 4 37 1154 900 254 aKi 55 33p[3 064 4 35 1191 990 201 60 36(7D p.81 033 1235 1080 155 65 39M 060 0 33 1313 117a 143 70 4200 058 O.32 1364 1260 1534 75 qspp 056 031 1409 1350 59 STORM 57ORAGE VOLLfME 80 4800 0.53 029 1420 4440 -20 85 5100 ❑ 52 028 147$ 153❑ 52 Mammurn staraga requirei = 705 cu. R. 90 5400 0.50 027 15aCi 1$20 -117 dalume prrnrtded at depttr ~ 992 cu ft. 95 5700 0.48 0.27 1553 1710 -157 OK! 100 6008 048 ❑.36 1600 i8w -200 Sf►nPsarr Englneers,lnc. 909 Mnrffr A►8enne Rasd; 3Pokane, YVA 99212 (50'8) 876-7372 ;~b-A ~ Stormwater Drainage Report H. STORMWAT'ER DRAINAGE CALCULATIONS: (continued) Basin B Curb Onening at Low Point, Sta. 31+00, right, Vercler Drive Curb Irilet #2 . h= 8 in. = 0.67 ft. Total height of opening H= 0.122 ft. Depth 9f water at entranGe Q= 0.41 cfs Total peak rate of flow Q= 3.087(L)(H)3R for H/h < 1, 0.122/0.67 = 0.18 < 1 L = Q = (3.087)(H)3n = 0.41 = (3.087)(0.122)311 = 3.12 ft. Construct Curb Opening; 4 ft. wide, 8 in. deep RAtraraAL FORMuLA FrrDRoLoGv DRAINAGE BA51N F#NALYSIS fvr 94 YEAR STORfN EVENT @ate. 9116r98 Praject IVame• Niidilome East 2nd Addihon . Qesign: kwm ' Projeet 1Vumber: 12838 D;sk F;ie. nj Inumen1Mi zssaA5 5ite Locatien N 1/1, S. 34, T. 25 N,R 44 E. VI1. M Basin Alame. B. Basin aescripfivn Verc:ler Ornre Point of Cartcentra#EOn $ka, 31+00, 18' Right SUBAFZEA5 In#ensitY-l]uration fvr 10-Year Starm Event Descnphon Acees c A'C T'ime Time Infensity lncrmnt. Incmnt Pavement 0.'i44 0.90 4.929 (min.) (sec.) {in.lhr} . W Im . 5.00 30000 318 5 300 3.18 • 10 600 2.24 ° 15 900 1.77 2D 1200 1.45 25 15DO 1 21 30 18€H} 104 Totak Basin Area, aores = 0.144 35 2100 d 91 Gompwde F2unoff Caefficient = 4 9oo 40 2400 0.82 Comhsned (Area' Fiunoff Coeftent) = 0129 45 2700 0.74 50 300D 0.68 55 33(1[3 a 64 • 60 3600 4,61 - TIME 0F CQNCEIVTRATIDN (minutes}. b'S 3900 060 70 4200 0.58 ' Tc (overland flvw) Tc (gut#er flaw) 75 450a 056 80 480D 053 Ct = 0.15 L2 = 988 85 5100 052 Z1 = 36 90 5404 0.50 L1 (A) = 18 Z2_ ❑.1 67 95 57W 0.49 A1(A) = 0.01E B= 0 100 6000 0 48 . S(R) = 0.0278 n= 0016 s = C1.[]118 TC (A) = 0.21 d = 0.122 L9 (8) s o Tc (gut-) 2-04 N(B) = o Tc(A+B) : 0.21 S(4) = Q Ta total 5.00 fntensdy 318 PEAK 0[SCHARGE, 10 YEAR S`fORM: Tc (8) = 0.0 Holding 6 74 { y pQ =C k I*Iti = 0.41 LI.F.s. 0(esdmated @ d) _ 041 C.f s Time of Concentrabors ~ 5.00 minutes ~ r y ~ 1z~3~ eAST zl'D ADb4TioM .sJz7-1 18 , - DFAMAGS C.ALC ULATl aN.S KW M C, ~O'T AL 6-q'}(55'} _ ~~,~zv ft.~ ~.~~►G ~Gr~ ~~Y~ ~ ~s`~~° ,~v~~►~~. : (vtoo to 1 +sv _ 38b, \rl~a~~~w,n 1-1-92- to I$3fi?6.12. = I'l 8.$D, A ~'~~~rE.~ r ~ '~r►vc~s ~ L,Uoa 3i04ta O'cre. ~ ~ k~►~~~vaaur ~ 1b, 42~ + 3, ovcs + OLtre ~ lzRi~S~ ~w~~'~~.'CT ` I~~`~'Z4 ~ ISr~jC1C7 T~i~ O-~5~~ 0.CF'~ 5~~+~1~1c'a~ RrGC~1l~R~ti : \/i kz.. ~►a. l~Yb~ ~~W 5~C1^stnc~ ~ } 1~i7rsu~i~~ goeh~r~~ L~'r'~~~~~ i~~is~rn°~ ~ l.v c~s au~~ 'STDF-ACE gC~t~Vti~~D : s)Nck1eS . G~z. v 4.7-0 > 1z-2- t`~l 1LQM~ ~A~~ 2~~' P+"Dl~lT1oN ~~z~~~$ ' D~f~1~11~GE +CAI.CLILFI~lOKS kV4 M SV4A4~ ~I~r5~t1 pAV~[°+~~E'rit a A~'~Aw ~~~R+A~~ S~v'iRAGE ~ 3 ~ ~ ~.~3 . T. S Q ~ 3 G3 411Do f'T.'L ~T3 ~ ~ w 3 (50°)(t.9$ f-T~) ~ -91 ~ ~ +C ~ = 3,4~~ ~~4'~~ ~r~} ~ 4~ ~1Z°t} ~Zn`~'~ ~►S~~ ~ ~10~ FTa~ ~ 5,~13~ F~ ~ ~.39 F~• 23 q~-r ~ ~ A 7a(, ~'[3 ~aZ❑ F~ 3 ~r.~. - - - - : ~i , p~, ~.E..w~ ~ v.5 e. v~n ~ n~C • ~ _ _ ~ - - -l D - - - - - ~ - - - ~ . z. o a ° ~ ~ 001 ~ ~ e~ 1~ ' • . , ~ .-717~•'.IIr r,7•: L - ~ ~ ° . _ " _ ~ i ° " ' . . . . r • i YC ~ R 4' • - ~ f ~ 67 - ~ i~ ~ ~y; ~ . _ s r _ f~~. ~ Cv+nc~~C.krb S~Na @. ~ a~n'~ ~ ►~eW rz1~- • •____..__~~~.r 1~__~__. !'M' e_ol Ca~ • . ' _...,..r _ . • _ „ - - 6.5 3 f~` _ r~_..____.----•___ _ - - - - - - - ~.~8- ~.GB - ~ . ~ I`'S~ ~ ~ ~ 711--7 ` ' ' - ~=-G? . ~ _s ~.-3r; ~ ~ t3~~~~ ~l t: - - - - - ~-Q.~e ~m e.~~- - { _ _ _ - g, p - - - - - . - ~ ~ - ~ _ _ _ ~ ti ~ - R ~.~~`J ~ A li~ ~ ~.~,'r'~ ~ k-I~~~ ~•'5 ~ • - Y ' fl~[ LVe.Wa~5 2.fl0"' ~ . I~~~~°. ~--..r~ ~;Y~ f ~ ~ i ` 1 a~ . . • a t ~ ~ . d Y . . . . i _ , v I - ~r ° ~ , _ ~ - - ' ' O- - - - _ ~ %5~~~ ,4~,r~► ~ . _ ~1~.~ . ~ _ y--'--•'"_ ~a - 4na ~1d~WAIF. .,I_ ~ - ~ .s -~.z~ ~ ~-56 . ~ ~ - j . . _ . . - r_ • .~~._..~.~~f~., _ - ' _ - : I - - - - - - - - - - - - - - - - F- IW - - - - - - - ~ase- rne.v,* , • - • `4~•-• - • • ~ ~ ` ~.~f i.SF ~ , ; ~ ~ ~ _ ~ ~ • ..'~97;~,. IJ~.:~y _ a~ - O l~n'i c'~• I F T. ~ l a ~ ~ • ~ I . . ~ - a , • , ; , y ; ; ~ r ~ y - Z , . , ~ • - - • - • ~ 4 ~ h' ~ ~ - ~ ' ~ N~~~►+~.1 ~Fti. p.13 r~,~ale~ - ~wq~~,_S~D~,~,. ~,o~~'r►°L1 . ►~Conc. Curb - - - Swwle- 'Fiattvw+ ` ` ---------.C.~ r~~~- S~ctlola,'r e 0, )NOLP _ _ , - 1-~- ~ - z C Z~~ ~ C ~~C 1~ ~ ~ ~ o.Cil Frr I Fr ^,~.1 ` ` . - ' • ~~W S e. Ytn 't"t - ---T ~ • : I - - • • . . - ~ • • - - _ . . fa ~j~ r ~.5~ ~ ` T D +~7 i] ~ ❑ C i V E W G'l~ ' ~ Arr ~ O.D~(cl ~"r.~~'f. T ~L•''Y'11 ~ 'r' • r e 1 ' t . L - _ , - 4r - - • • c- v 7 . • k.'N.ar,r~.,1_i;':~1:,'e7+.r~. a 9 . 1 , ~ 'J 1 1. • ` " ' f~,~;r~~i'l,+Z~.rf ~ ~ ~ 'l1~~'~1h~', ~ ~1 ~'4-~~• ' , D - - - °rmal ~Qhc.. ~ S ~ o _ _ . - - - - ~ • • - ko4 Cr05~ - ~e C-tti0n0.1 4,t^e-0. o~ S'W 0.A e- - - - . l ~.7.,~ t•~3~ ~ o .S).?-a) 8 ~ ^ ;s ' t,°~ _ ta•4~ Zsoa s,. ~'~'.s..... =3. ~ - • - ° - __.s_.. Y-• O' - . • _ _ F S C}E'TENTION BA5iM DESfCsM• RATlOFL4L FO14NfULA F[Y[)Rt7Lt]GY & BOWSTittNG METHQ0 DFiW1VAGE Hi45lIW ANAf.YSiS Tnr 10 YfAR 5TC3RM EIIEPhT Date. &71I98 Prolect IVarrta: Midilame East 2nd Rddihan Jab No.: 12638 Rrvlect Locs6an° iJ 112. S. 34, T. 25 fV , R 44 E W M Designer: K. MCMLlLKIN Drainagm 8asan Name. C. pisk i7ir : A1'1bawstnrsg Qrairtage Basin desesplion Onsft F[sname: 12838jds 'Z05* Fbnding Rrea hfarrre: swafe Fvr. Tnrnlirrscn Pnnding Area Lar,~on north suie af 35th Avenua Paim at CencentrabCw t.P.94-5D, Lt. - &UBAREPwS i13ViE 0F GO3VCENTRAfiION (Yc), mmutes ' Qescnpban Aces C A'C Overtaml Florv Channel Flovsr /Cr+ag►vrous `208' R►sss: _Swrrae►'rt A: L2 ~ 36D - Asphalt Pavement 4.Z39 090 0.215 GY A 0 45 21 = 73 RcsaTs 01400 0.e0 0.000 L1 {A) ° 0 e'.2 ~ 8.8 Dr'svewa}rs 0069 0.90 0.082 hIfA3 = a.4 B a a Grass LaNm 0.354 0.15 0.053 &(A) a 0A1 n _ 0,03 rc (A) = 000 g a 0.016 ONrerAreas: d = 6280 S~rr~errt B: LS (e} _ 0 Tc (ch ) 357 N(B) = a rtc(n+a) a 000 sisy = n tc totaG 5 0a Tc (g) = 00 Irrtensity = 3.18 Tatal 8asm Wma, aum = 0662 C.ompasr4a RunaH Caefficient m • 4 50 Cornhined {Area ' RurofF Ce¢ftert? ° 0 330 0(estimaGed ~ d) = 9.05 e.f s. Tima af S:aneerftion = 5.00 msnutes - "208" aRAINAGE PARAMETERS '2[}8' PavementArea = 10420 sq ft. REIi1C D15CHARCiB. 1Q YEAR 57flRM '208' Volume Provisled = 620 cu. fL at fa' depth Sto[E1! .CJt4fi$$0 PmVld'ed ° 62D Cll, IL St ir d9pt1 Q ='ri i I*IA = 1.05 C.F.S. BOWSTRIN.~'a C.ALCULAT;0NS ri aa io NUMBER ard T'dPE of EiRYWEf.LS PRC1Pt]5ED Time Ttme Irriensity Q deV V in V out S'bwaga In[xmriL Iftcrmnt, a Slrtgle-&mF (SPaka►e County Type A) [mcn ) {sec.) (inJhr} {cis} (cu, ft} [cu. fr.) (cu. #tf 1 Sou61e48arref (Spatam Ceurrty Typn B) (9,~ ~lG~ ~ (95461 ~'i s-iFs a t Qudlow Rrovtded: 1 c.f.s. 3_% ym. 4M ;A 7'ff 1[] Sf70 8.24 0.74 518 600 -81 i5 500 1.7 0.58 588 900 -314 20 1200 145 0,48 624 1200 -576 25 150D 1.29 0,40 i',~4i1 15flQ -M '2DB' 1'REATMPNT VOLLIME 30 1800 1064 0.34 653 18M -41 A7 SS 2100 0 91 0.30 662 2140 -1438 Requimd G.RA. pand"sng wdume. aa aaaa 0.82 0a7 678 240o -1722 imawvious -2W ,ama xirr = 434 c,. fL 45 2700 0,74 024 685 2700 -2015 vWunta prwAdod et 6' depth = 820 w. R 5a 3000 0.68 0.22 697 34= -2303 0 K2 55 3300 0.54 021 779 3304 -2581 BQ 3600 0 61 020 748 3600 -2854 55 3900 060 0.20 793 39Qt} -31OT 70 4200 458 0.19 824 4200 3378 75 4547D 0.156 018 881 4500 -3849 57f)Ri4S STt7RAGE 110LUi4AE so 48(]U o.'53 0.18 858 4800 3542 s5 5100 0.52 017 894 5100 Mamm~m sWrags ~~ired _ 122 cu. fL so 5400 a.50 0.17 909 saaa -4491 velume R►mdod at a- aepth ~ e20 fL ss 5700 o.as 016 , sas 57M -4761 OK! 100 8000 048 0.16 957 6000 -503 i Slmpson F.n9fneefa. frrr. 909 Afanh Argortrre fi"ead, Spokane, WR 38272 (W9y 926-1322 Stvrmwater Drainage Report H. STURMWATER BRAIlNAGE GALCT_FI..ATIC)NS (can#inued) Basin C Curh Oneniniz at Low Point. 5fa. 9+50, Ieft, 35h Avenue Curb l.rilet #3 (Existing) h= S in. =0 67 ft. Tvtal height of apening ; H = 0. 103 ft. ~"Jepth 4f water at tntrance Q=0 38 cfs Total peak rate af flow Q= 3 087(L)(H)"' for M < L, o i 03/o 67 = a 15 < I L = Q - (3.087)(H)312 = 0.38 = (3 087)(0 103)"2_ 3.72 ft. . Construct Curia 4pening, 4 ft. wide, 8 in. deep J4 RASIONAL FORMfJLA HYQROLOGY ORAJNAGE '9ASIt+t AAfALY51S for 10 YFJaIR STLlRilli EVENT []ate: 9l3srsa ~ Praject Nama Mtddome Easi 2nd Addftn ' Desagn: kwm Proaeet Numter 12&18 O;sk Fire- ati var,m8nsall 2838ids Srte LocaiiQn' N 112, S34, T. 25 N, F8 44 E. W M Basin Name "C" Basin Descriptron• 35th Avenue Point of Caslcentra#ion Sta 9+50, 18' Left SUBAREAS WensxtY-QuratiQn fQr °f 0-year Storm Event Descnption Acres C R'C Tirrre Time Intensaty Incrannf. Incrmnt. Pavemertt 0132 090 0118 (min.) {sec ) {inJhr} (w6m 500 307.40 3.18 _ a 300 3.98 10 600 2-24 15 900 1.Tr 21) 1200 1.45 25 15C10 1.21 ' 30 1$00 104 Tatai E3asin Area, acres = 0.132 35 2100 0.91 Compasite Runoi Coefficierd = 0.900 40 2900 082 Comhirted (Area ' Ruroft' Coefficierft) = 0,118 45 2700 0 74 50 3000 068 55 3300 o sa 63 3600 0.61 71ME C7F CCSNCEN7F8ATIaN (mmutes)' 65 , 3900 0.60 7m 4200 Q 56 Tc (ever[endflaw) Tc (gutferffaw) 75 4500 0.56 8(1 480(l 053 C; = 015 L2 = 9 45 85 5100 52 Lt = 36 90 54Q(7 050 Li (A) = 18 7-2 = 0.167 95 5700 0.49 N(A) = 0 016 B= d 103 6000 0.4$ S(A) = 0,0278 n = 0.036 s = n-025 Tc (A) = 0 21 d= fl.'! 03 Ll (8) _ ❑ ' Tc jgut.) 1 21 N(g) = 0 Tc{A+B} 0.21 S(B) = 0 Tc toiaf 5.00 Intens0= 3.18 PEAFC DISCHARGE, 10 YEAPt STORM: Tc (8) = 0.0 tioldieg 5.17 C7=C't*A = 0.38 C.F.S. Q (eshrnated @ d) = 0 38 c i.s. Time of Conoertrabvn = 5.00 minertes c k - - . lZ $3,3 eAS`r Vv' IhDI)dTloN D?-P+i RP+C. S (:P+ l- CU L ATIOrn15 f KW~ Fr4sIN D . E A °if]U acrE N e.r c.lUri4 e ; Z7 $-L p -~o 7- °1 $ 6 'S.101 = 2-'t3. l`R ~ I'ST" u+~ 49 .E1B') + ~ 4z,3; i~t~,~ ~ lz~b$ l a,C.'rP- ~ DRt VS: 1,(]0+7 ; ~ ~~~]Q7 r~.` -ti. ~t_p~lE~ ~7leY•~f K,0u~e.5 z to,oo o a,2-19 (a o,,:z;r e ~trnp~l~vros~~ ' A ZG, DS 6 a lq i-t,~ ~ 0 .9 830 a.cr-,~ . S To r-- RCsF- AZ S Q~71p- E'D : ~\Z ~os ~ ~ ~ ~ . ~awr i,^~ e 5 11 E. ~ 1 ~au~ir~~, ~~~'r~~ ~7r-• 9 S'To?-A<&S Fgov,~al>-~ .~A- . . • • - - - - - - _ _ - . • r , . - axw9iri°',,rd17G tc~ _ . . _ . .,..:.~.~o r " • a - M1v11.vMS ;5AS7- 2ND p,UVtTjvt4 'P NV S(°°I Ehl TA'r~ eA 5 W A LS 5`~DF-NCzS PVAILABGr= ~ ~ i 900 F; " `19 , ~ t 17r ~3 {50 ~ ~ 0 ~ i. S R.~'.` i•j ~5~ •9 13 IF"T`~a 19 ~i. i ~ 50 _ +(~5~`~~~~~~; ~z',`i►~ ~ + ~3.~5 F~~'~ Z~~ F~~ . ~45 ] [ t ~ f -C ] s + ~ (-t 91) 6,B) ~ l z.z fli 59 3 ~ ~ 40 ~z? ~ ~55`~[l•98 ~rt~~ ti tog ?T3 ~ TL)~ G.y034 f "C~ 195 ~Ti-~ ~ ~5~~~1,~•~~ 1'~~ ~43 ~ 1s- ~ ~T_ b 'FT•J ~t • ~ F~~~ 1z,o$l FI= 5 v¢ i-Av-z ~ : ~s.~...: •-=~-_....w d-~ ~ , . • - - - - ' • - • _ - - - IW - _ _ • . - - - - - - ~ - E o, 5 ~ r~ ►~"C- ' - i '~4~~ ~7r~►vewc►~ . ~ rs~: •~~r~ J1l,..~ + L ~ -~s. ~ ~ , ~ ~ ~ -r.IIJI~ D 7• ~ ~ ~ , • , `q ~ _ , ~aa~ • D.~l~~] ~rT.Ar~'. f~~~~i~~F, } ` Y ~ r ~ ~ 7_~~ i i • ° 9 . E . O'k e- 5°~~ - c- vnC. , Curb ~ Swalv- 8vttvm - - - - ~ - - - - - - - - - -f _ s,~" - - -t - - - ,►~c~! -_._~z L~ I~d'~JL`~.zz] ~ 0.~~~3.~4~ ~y P~~ ` $•~.9~ ~,~5 ~ 1-~~ o-q 4 ? ► _ . ~ . - - g~~r ~ - - - 43' ~wS e- me- U,~ ~a~ aT ❑~i~~W~,l~ - Y n d 03 0. O r t ~ ,6 ' - e • - 1 ' i I ~ • ~ a 4 t - .~~~i ~P ' , .r• ~~~r~ • - AI,{~ d! ~ ~ ~ l1! ~ cwSrope--~ - - - - -fl?'~ k- Ca+nc. C'~v5~ ~E.~"itCnu~ S'rqAk , . . _ r----~.. . rF~' - - - 3. ~5 F i DETEM`fON BASfM [3ESlGN Hk7PaiVAL FORMLlLA HYDRC}LOGY & B[SWSTRING METHf3D ORAINfiGE BAS1N AIVAL,Y51S Foe 10 YERR ST❑RM EVENT []ate W3/98 PralecS Name' hllidilome East 2nd AddiGsn J06 No. 128:15 Projecf Locatian• N 112, S. 34. T 25 N, R 44 E V4f.M Rzugner K. MCMLdLKlIV Orainage €iasin Nama D. Disk [hr : AT:lbovvsfrFn9 Orainaga Basin Qesttip0an []nsde Ffenama: 12838ids '2{DS' Pondirtg fUea r*lame swale For. Somfins4n PQnding Rrea Locatlon' north 5ide a! 3ft Avenue PaEnt of CancentraD4n. E.R. 1+73.88. Rt SlJQAREA$ 'FIME OF CON~`.ENTRAnON (TC}. PTIlflllt8s [7escnRbvru Rcras C A'C f]aerlastd Flaw , Channel Ffew lmnervrous "208" Are&s Ses7[neatA LZ ~ Aspi~aH PavemeriY 4.277 6 99 0.250 Ct = 015 Zt ~ 42 3 Ftnafs 0230 0 80 42247 L1 (A) = f} Z2 = 8.6 DrNewaYg O.092 4 90 0.683 kV{A} _ 04 6= 0 Gress l.avrn 0.9w fl 15 0147 5(A) = 001 n= a.D3 Tc(A] = 0.00 s = 0.014 [S#wAreea: d = 0378 5eqment B. , L1(8) = 0 Tc {ch ) 165 N[8] = 4 Tc(A*B] = p 00 5{B} = p 7c toTa! 5= = Total Elasin Rrea, actss = 9.5$2 Tc (8) Q.d IrrtensifY = 3.18 Camposrte Runcff Coefficrani - 4,43 Camhined [Anaa ` RunefiF Goefificient) = 0.686 t! {estmated @ d} = 2] 8 e f.s Time of Concertratian = S OD minutes `208' QRRIIVAGE PRFtAMETERS '7W Paveme'rtArea ~ 12081 sq. ft_ PEAK D15GtlARGE, 10 YEAR STORM "2fl$" Valuma PTGVtAed = 907 su. ft. at B' r#epfh &SArm Storage F>ravided = 907 Cu. R. at 8' dapth Qa C' I` A= 2.18 C.F.S. B(]WSTRING CALCULATIONS 42 9~3 A & Pti v7 NLJM9ER and `IYPE a€ C}RYWEd...LS PRDFQ5E[7 Tima Time fntarssrty Q deu. V irs !1 aut Sfnrage Incrmrtt. IncrrnrTL 0 Singts•8arrel (5pokane Ctsurrty Type A) {mcn } (sec) {inlhr) {ds] [cu. €Q [cu ft.] (CU ft.] 1 Doutsia-8arcel (5pntane County Type 8) {*1'fs'D} {A'C-M I ouffi 92 [#5~i#} $ ~ ~ $ ] . s ~ Y ~ $ 2 ~ f ~ ' ~ i OuttltrW Provlcled• 1 e t s 5 im sm 2-M iM 3a a'7T 14 HOU 2.24 154 1079 600 479 15 900 177 111 1217 900 317 20 1200 1 45 100 1296 1204 96 25 7500 1.21 083 1330 15m -170 '2D8'TREATh4ENT VC7LlJNfE " 30 1800 104 0 71 1358 i 80D -442 ' 35 2100 0 91 17.62 7375 2100 -725 Reyuired G.PA pvneling Vnlume: 40 2400 082 9 56 1408 2400 -992 Irnpanriaus '20E' Area x 1 t2' = 503 eu. R. 45 2700 0.74 0.51 5423 2700 -1277 nofume provndod at 6' deipV3 = 907 cu !i. 5S7 3000 0.68 047 1448 3000 .1552 pKI 55 3300 0.64 044 1494 3300 -1 806 60 3600 061 042 i 55f1 3600 -aUSfl 55 39W tl W 0 41 1648 3300 -2252 30 4200 Q SB C] 4[] 1712 4200 -2488 75 4500 [].S& 0.38 3769 4506 •2731 STORM STf}RAGE IdDLUME ' 80 4800 t7.53 0.38 178:3 48OQ -307 7 85 5100 052 036 1856 51 Qfl -3244 Mawmum stnrage requrred = 577 cu. R. 90 5400 0.50 0 34 1888 'SdW -3512 volume prawded at W depth = 947 cu (G 95 570a 0 49 0.34 1951 5700 -3749 pKr 100 600D 0 48 0 33 2010 60045 3990 SJrr►p,sorr Fngmeers, lrtc. 309 Nwth Raganna RoaA Spokane, kVA 93212 (509) 926-f322 -s~.. . - _ . . ~ n . . ~ - ' . w•'3 - . ` , • _ s St0[11aw5ter D1d1I1~~e RepDi't 11. ST~~~~ DRAINAGE CAL'eULATIQNS: (Ctl1ltlIIlled) BaSITI D Curta Qnening at Lcaw Point, Sta. 1+78.85, right, 35`h Avenue Curb Inlet #4 h= 8 in. = 0.67 ft. TvtaI height af opening H= 0.096 ft. Depth pf water aC entrance Q=0.20 cfs Total peak rate of flow Q= 3.08 T(Z-)(H)"2 fvr HIkt < 1, 0.49610.57 = 4.14 < 1 L = Q = (3.087)(H)"2 = 0.20 - (3.087)(0.096)' _ 2_ ig ft. Cnnstruct Curb C]pening; 3 ft. wide, 8 in. deep Curb Oneruniz an Continuous C;ra& Sta, 28+73, right, Vercler I]riVe Curb Inlet #12 - ' Sta. 28+23, right, Vercler Drive Curb Inlet #13 S#a, 28+73, right, Vercler I)rive Curb Inlet #14 a= 2 in. _0. 17ft. Flvwiine depression at opening y= 0.06 ft. Depth vf fleaw in normal gartter Q = 0.06 cf's DeSign dischaxge QaIILa = 0.04 From Fig 16(a), pagc 6-39 "Spokane CountyGuidelines fvr , Stormvvater Management,° L = Q,1(Qa/La) = Q, 4Gl0.04 s 1,50 f$. +Canstruct Ctrrb Qpening; 3 ft. wide, 8 in. deep R ~ F . . . - . " R4TlONAL FORMl1EA HYi]RC7LOGY ORAINAGE EiA5[N ANe4LY5f5 fvs 10 YEJ4R 5TI]RM E11ENT Date: 9116A8 Projec:t Rlame' Mid'sloase East 2nd Addzhon Oesign: kwm Projed Number. 72838 nmk Fla: Al vabaranl (At208-ts 5de Laca3ion: N 1fZ S. 34, T 25 N.. R. 44 E. W M. 8asin IVame: 'D° @asin C1escnptton 35th Avenue F'ant of Conoentrabon- Sta. 1+78.86, 18' Right , SUBEhRFrAS: Intensity-€3uratsan for 1D-Year Storrn Event DesmphOn Acres C A'C Tme Tirne Irttertstty Incrmnt 1ncrmnt FavemenC 0069 O.90 0.062 {rtsin.} {irr.fir) t"M S.00 300.00 318 5 300 3.18 10 600 224 15 90D 1.77 27 1200 1.45 25 1 5M 1.21 30 1 soo 1.04 7cta1 Basin Area, acses = 0.069 35 210(} 0.91 CQmposf#e Runsrff Coefficier►f = 0.90d 40 2403 082 Comhirted (Area ' R4maff Caefficient) ~ 0062 45 2700 0.74 50 3000 [].G$ `S 3300 064 60 3600 0.fit' T]ME OF CflNCENTRHTiC]N (minutes): 65 3900 0.60 70 42DO 0.58 Tc (csve►lend tfaw) Tc (gufherffow) 75 4500 17.56 8o 480(1 053 ~'ut = 0.15 1.2 = 90 85 5100 0.52 Z9 ~ 36 90 5400 050 L1 (A) = 18 I2_ a.1 67 95 570[3 0.49 IlV(A) = 10016 B= 0 100 SDO0 048 5(A} = 0778 n= 0.016 s - O.0t Te (A) = 021 d = 0.096 L7(@) = 0 Tc (gut.) 1.24 N(B) = 0 TqA+6] 0.21 5(B) = Q Tc tota! 5.00 IrWrtmty - 3.18 PEAK D{SC'#►ARGE, 10 YEAR STiQitM: 1'c (B) = D.f] HWding 3.21 Q° C*I*A = 0.20 C.F.S. Q (es{[R18tE~ @ d] = 020 C.f.S_ riISe Gf ConcefStdtio[1 = .Cl.00 Tt7111ZE9 fl K - ~ RATIQNIAL FI3RMULA FfYpRL3lOGY DRA[NAGE 81451N AIVALYS[5 for 10 YEAR STORM EVENT , [7ate: 311 6198 Pra,;eat Name: Middome East ?nd Autdrhvn Qesign kvvm Prood Number 12838 t3mx Site. Rs Vabm2nl rnya.M&As Srte LoaaLcs~°s°s- N 9/Z S 34, T 25 N. R. 44 E. W M. , Basin Nar►te: "D° Basiro L3escripGon: Vesder amre Raint of Cancentahon• Sta. 27+73, 18' right Sta. 28+23, 98° nght 5ta 215+73, 98"rx,ht SLlBAREAS. Irttensit5r-Quratson for it]-vear SEarrn E^vent Qescrrptian AcreS C A'C Trne Tme fntens[ty tncrrnnt, Irscrrnnt. , Padement 0021 090 0.019 (mirr ) (sec.) {in Air) [0+'M 5.01) 300.00 3.18 5 300 318 10 6DC1 224 15 900 1.77 210 12DO 1 45 , 25 1500 1.27 30 1 80D 1.04 'Fatai Basan Area, acres = 0.021 35 2700 0.91 CQrnpoMe Fiurtaf Coeffaerrt = 4.900 40 2400 082 combir~ (Area • Rurkaff Coefficiert) = 0.01 s 45 z700 0.74 50 3000 0.68 55 3300 0.64 w 3600 0.61 rIME OF cONcENTRATIoN Wnwes)- 65 3900 060 70 42Dn 05s Tc (overiand ffow) i c(gut[sr Row] 75 4500 056 80 480} 0.53 Cf - 015 1.2 = 5} 85 5100 47 52 Z1 = 36 90 540D 0.50 La (A) = 18 Z2= 0167 95 570D 0.49 N(A) = 0.016 s= 0 900 6000 048 S(A) = o.OZ78 n = 001s s = 0.01 Tc (A)= 411 d = 0.06 L1(B) = Q Tc (gut-) 095 N(B) = t] Tc.(A+B)• 021 $(B) = Q Tc taw S[IO Irrtermty = 3.18 PEAlC D115CHARGE„ 10 YFAR STQRM; TC (B) = 0.0 Hddirkg 1 78 Q= C' I' A a 0:06 C.F.S. (esWTmted C d) = 006 c.f.s. Tims Qf Corooenhation = 5.00 mmvtes 01 . . ~ . . . ~ - , . nERTF4 OFFLi7W - yr - F£ET • • 4-e . , -a • , ~ .01 .02 ~ .43 .04 .45 .GQ' ~.10' F ~ ' ~ .3 .3 .e .i .9 .9 60 b . I! f ; ' l ~ tA 4 ~ r T~ . ~ i -T- i--.L 4-G -r7l ~ I I 4 `-4-4 f ~3 , .~r , ~ I I [ f j i ~ j I ~ ~ i~l~ ~ ° Ipp I ~ r ~ I i I i ~~►fi,~` / i ~ f i I I I t I I I 1_ ' ❑.Q I fil d I I ~ .aa ~ ~ ~ Ir I it ~ .oz a r ~ r I I i i~ f R I g~` . or ~ a l flISCHARGE PER FQOT OF i n!v i• ' LENGTFi OF CL1RB QPENING INLETS WFlEN iNTERCEPTiNG -a 100°1e OF GllTTER FLO1N - - + ~ a o• y C~ ~ f I I i (b) PARTIAL fNTERCEPT9fiYN 1~3 Rariv FaR iNLE-~S OF -~--1 LENGTH LESS THAN L ~ f*• ~ 1 ~ (I 2 ~ f 1 w oool ~ i b ~ g_ I_ l I .io L/Lo CAPACITY OF CCJRB DPENING INLETS O[V CQNTINUdUS GRA~E 6-39 FdGURE 16 ~ t • , # . . ' ' ' _ • , ♦ - ' - , a^ .s' ~►~1~~1.D'4~i~G .~~'s5`~ ~~v {~,~i7~tTl~~l 9$ , . KwM 7- 11,15a ~t•z 0.+075 o~ ~ l~~rcl~r L7ra►~e : z~~6~.~~ to ?-1+z.v x 5k.$il 3~r ~4 Av~n~~ : b~ ►8 tfl Z+Sv = z-i?-, , (s72)(eS'} + (7-32:)(18') _ 5,tlz fi.-- v.~`j-j ar-~re- PRWvE 5 ~ ~ C3r►ves ~ l,0 0 0 2 1 00,0 Ur:ve- ~ ftovFS 7 zlDtV0 wC~r, F,ars ~ s ~ 51112- + Zil:>Dp ~ Zqo-vo ~ l12 ~'t~• ~J,~~s~~ 4cr~ 1r~1~ 16 vl+l t e u 5 ~ 9, 112. ~ 8, 6~~ f~. ~.19 8~ ract~~ ~~01F- 'kGF, RF-t~utD ~ 1 b} ~aWs#rt~nc~ ~ 1IB9 # 1 5ir+31e. B*rtrel Drywe-U '(0.3 ~-~s ou+) ~ • i.+E i~. ~ ; ~ z ~ I Z "9 T•~ 7 ~ 0 a, ~ . 4 ' ' ~ . if' r1\~ILoME EA5? 2~D ~1DUITto1~ S~98 M ~-~[tA1NAGE CAI-CVLAT1oNS 17.a "2og" S WAI.E $A51N PAVEMENT AFZE~ SToCzAGE STDRAGE T-EQUIRED AVAlLABLE .9~ 63.81') 0 ~ (Si )(l~') = 13b Ft Z ( 15.11`)(t •q~ (tsi~ ~ Z,~ 36 FSt 6•9 8 FT Z) = l03 3,b~z Ft Z 153 Fz ; l61 F T•3 ~Z ~`$0~~~E`) = 1,44o Ft~ (oo FT•; ~56)~1.9~ FTL~ z l~l FZ 3 ~ O fC t•~ 0 fT 3 . T.`) 3 5~11z FTZ 2~3 FS3 2~Z Fz~ t• , _ , . ~ , . , ' " • ~ . . _ ~ . - - - - - M10~I~OM~ ~AST ZHU \Z93$ ~ . . - - - ~ - - - ~ .z - ~ - . ~ _ _ - - - . _...~L/W - ~ - - _ 13 Eo.S~rnev~ • 1-------------.___ ~ _ ` ~ .S~ . . - Zoe o~'_ Dr~ve.Wa~ - ~ - O.ot~"1- c"j./Ft . ~ , . ~ ~ . ~ . , ~ . ~ ' . . . . , . . , o . , ~ ~ " , • . • . . ~ ~ . ~.FT ~ ~ ~ F~•~~F~~"51o Norr"°~( FT.~.~~~.~f~ ~ S~°' . r vY► . . . - - . . . - - SWale0 _No _ \ '~-Corc. . _ . . - - ~ . . a ..51Pe-_ CArb SwaAe. 8cttow► - ~ ~ - - • _ . _ _ . . - _ lo' o'. _ -C'~ o~s S.est to_v►o,~. _P_Ar.~~~~~ w~~.__---- - 0•5) C4.21~ (0.5>(3.G4~ L ~.9$ F-T. ; , 4.29op 3^GS / l-ol 0.91 . ~'//6 ` - ~ • - . . . . . . - • ~ "\3 ~ . . 1 . ~ G • FT, - ON \'~1~ . . . . . • - _ 0-. , Fr • _ . _ . . Rlw ' - - - - - - - _ _ _..13~.... E a~.mf.v~..t.r _ . _ _ . _ ..=7 _ - - - lo~- - ~ - . g.5~-•._.___.._----- 1.5~ - . 4, ~~,..,,•,tif~.~~~;, _ as, 0.0 ti6, _ ~ \ . ♦ . ~ i • / • O \ ♦ . \ ' ~ . . ' • Q • O \ . 4 ~ ~ ! _ \ ~ \ ~ ~ . l . ~ • ~ , .._.:_..__.__N_.. o.116~ ~ FT•/F ,,,c~„~~7 ~ \ _ ' \ . ~ . . . . Wa SlL • - .p~ti~ - • • Cohc. . °Pe Swal~ Bo~tot~ Cv.rb . - . - - ~ r _ • L 1f 1o~ ~Y~t5 s - I' . ~ _ . . . _ . . . - - _ 4.z9 °O ~•93~,~ . ~i~~o.5~~4.Z9~ ~ ~ z~~o.5~~1.93~ ~p.5~~4.0~ p k, ol _ ° •4~b. Z. 0c ~19 -FT~ ~I .yA~, . . _ z I FT ~ ~ - • - _ 3.55~ F'!•._ ----__-•O• o;•,_.-_--•~--••-•-•.-•--.~.._ • . ;,-"~~"'c z`, . - - - - - - - DETENTION BASW DESIGN: RATIONAL FORMULA HYDROIOGY 8 BOWSTRtNG METFIOD DRA(NpuGE BASIN MIALYSIS for 10 YEAR STORM EVEM Date: 8/18198 Projed Mame: Midtbme East 2nd Addition Job No.: 12838 Project Location: N 12. S. 34. T. 25 N.. R. 44 E. W.M. Designer. K AACMULKIN Dreirtape Basin Name: "F Disk Oir.: A1:bowstrin9 Drainage Basin Desaiption: OnsibO Flename: 12838ids '208' Pond'mg Area Mame: awale For. Tomtinson Pond'utg Area Loeation: reorth side af 36th Avenue Point o! Cancentration: E.R. 0+38. Lt SUBAREAS TiME OF CONCENTRATION (Tc), minu6es Descticbon Rues C A•C Overtand Flow Channel Flow Imne►viotrs 708'Areax 0.spfmlt Pevemeirt 0.117 0.90 0.106 a~~' 2t2 Raols 0.046 0.90 0.041 L1 W n 0.10 Z~~1 ~ 7.3 8.6 DriveweYs 0.048 0190 0.041 N(A) - 0.4 Bn 0 Grass Lavm 0.198 0.15 0.030 S(A) = 0.01 n a 0.03 Tc = 0.00 s . 0.009 OtherArset: d = 0267 S~e _ment 8: Ll(B) = A+p) ~ Z.~ N(B) ° 0 Tc(a+! - 0.00 S(B) = 0 Te Eafal 5.00 Tolal Basin Area, auea = O.,qpg Tc (S) ° 0.0 irttensity = 3.18 Composite Rurwti CoetflaeM = 0.54 Combined (Area ' RUnoB CaeftieieriQ = 0218 Q(estimated @d)= 0.69 C.fs. Time af Coacentrabon = 5.00 minutes '208 DRAINAGE PARAMETERS '20lr PevemeM Area ' 5112 sq• R PEAK DISCHARaE, 10 YEAR STORM '208• Votume Prvvtded a 272 cu. R at 8' depfh SEorm Storage Provided = 272 cu. R. at 8' depth Q= C• 1' A- 0.89 C.F.S. BaWSTRING CALCULATIONS ~ A ib ifb $T- NUMBER end TYP£ ot ORYWELLS PROPOSED - Time Time lrrtertsilyr Q dev. V in V art Storage InamnL Incmnrrt 1 S(ngle-Bamel (Spolmne Coun1Y TyPe W (min~.) (see.) Qnfir~ (ds) (cu. R) (a?• R) ! 0 Doubfe-Bartel (SPokarie CourttY TYDe B) (i1'60) ~ ) ~irU's2) '~3~a6 iT'~ 79-11M Outllow Provided: 0.3 ct.s. s im Xi'6 u:0 zn db iw to soo 224 0.49 343 teo tss 15 soo 1.77 0.39 387 270 117 20 1200 1.45 0.32 412 360 52 ss 1500 1.21 0.26 423 aso -27 '208'TREA7MEfYT VoOLUME so l800 1.04 023 431 sao -109 33 2100 0.81 020 437 830 -193 Requfred d.PA pondinp volume: 40 2400 0.82 0.18 447 720 .273 tmpervious'208' Area x 1? u 213 cu. R 45 27OO 0.74 0.16 452 810 358 MDlUtR@ Pmvd9d et 6' depth ° 272 Ql. }L 50 3000 0.68 0.15 460 900 -440 OK! 55 3300 0.64 0.14 475 990 S15 80 3600 0.61 0.13 482 1080 S88 66 3900 0.60 0.13 524 1170 -646 70 4200 0.58 0.13 544 1260 .716 75 4500 OSB 0.12 582 1350 -788 STORM STORAGE VOLUME 80 4800 0.53 0.12 568 1440 -874 85 5100 0.52 0.11 590 1530 -840 Maxpmum storape roquired ~ 189 cu. R 90 5400 0.50 0.11 B00 1820 -1020 volume prwided et 8' depth ~ 272 cu. R 85 5700 0.48 0.11 6Z0 1710 -1090 pp 100 6000 0.48 0.10 839 1800 -1181 S/mpson Fig9wasa6 !na 909 Nortl► Aiporure Rb@d Spok+rmt WA 89212 (609) 8161322 a~.e ~ r~7 . . _ . . , k ` • - ~ . . . Stormwater Drainage Report II. STORMWATER DR.AINAGE CALCULATIONS: (corninued) Basin E Curb Onenina at Low Point, Sta. 0+43, left, 36`h Avenue Curb Inlet #5 h= 8 in. = 0.67 ft. Total height of opening H= 0.085 ft, Depth of water at entrance Q= 0.15 cfs , Total peak rate of flow Q= 3.087(L)(H)3n for H/h < 1, 0.085/0.67 = 0.13 < 1 L = Q = (3.087)(H)3n = 0.15 = (3.087)(0.085)312 = 1.96 ft. Construct Curb Opening; 3 ft. wide, 8 in. deep ~ i ~ - AohL RATIONAL FORMULA HYDROLOGY DRAINAGE BASIN ANALYSIS for 10 YEAR STORM EVENT Date: 9I16r98 Projed Name: Midilome East 2nd Addition Design: kwm Propct Number. 12838 Disk Fle. A1 4auona111017Z838~ds Site Location: N 12, S. 34, T. 25 N., R. 44 E W.M. Basin Name: 'E° Basin Description: 36th Avenue Point of Concentra6on• Sta. 0+43, 18' Left . SUBAREAS: Intensity-Duration for 10-year Storm Event Description Acres C A'C Time Time Irrtensrty Incrmnt. Incrmnt. Pavement 0.053 0.90 0.047 (min.) (sec.) (in.lhr) (a+'srn 5.00 300.00 3.18 5 300 3.18 10 600 2.24 15 900 1.77 20 1200 1.45 25 1500 1.21 30 1800 1.04 Total Basin Area, acres = 0.053 35 2100 0.91 Composite Rurroff Coeffiaent = 0.900 40 2400 0.82 Combined (Area ' Run)ff Coefficsent) = 0.047 45 2700 0.74 50 . 3000 0 68 55 3300 0.64 60 3600 0.61 TIME OF CONCENTRATION (minutes): 65 3900 0.60 70 4200 0.58 Tc (overland flow) Tc (gutter Row) 75 4500 0,56 80 4800 0.53 Ct = 0.15 L2 = 47 85 5100 0.52 Z1 = 36 90 5400 0.50 L1(A) = 18 z2 = 0.167 95 5700 0.49 N(A) = 0.016 8= 0 100 sppp 0.48 S(A) = 00278 n= 0 016 s = 001 Tc (A) = 021 d = 0.085 ! L1(B) = 0 Tc (gut.) 0.70 N(B) = 0 Tc(A+8) - 0.21 I S(B) = 0 Tc total 5.00 Intensity 3.18 PEAK DISCHARGE, 10 YEAR STORM: I Tc (B) = 0.0 Hold'mg 1.67 Q=C•1'A= 0.15 C.F.S. Q (estimated @ d) = 0.15 c.f.s. ' rme of Concerttration = 5.00 minutes I E _ ~ . ~ , , \2~38 N11~ tL.t~M~ ~A =T ZNV AD1~ ~T l~N 5 j2lo~a8 DFZAt~AG~ CA~-C'ilLAT1oN5 KWM ~As~r~ µ Fu oc T~.' l.l03`~- acre P,R~A z ozA L + 3~ TH PVEN~E 2i Sv ;0 5{0(,.84 = 256.8}A QP~~, 41 V1~C~lN1A gDP,o : b} 1~ to ?k 89.g4 = 3i1. 3, 357N ~v6NUE • -~s. r - I1 lo~ru =s v.2%D~ o.cre 1JG7 ;Z1 ~ *JCr ~ ~-t14~ a`Ye (o b.Zl:S ac.re A~c o c= C)r~V C. ~Z.OOD = 2g~~(o Tt? o_45s3 atC'r ~ ,A 1MPER`!i oU.= - ~5,524 Ts.~ ~.CTS) acr - -14~ZOO - Z$~6~6 ~ S'Co~AGE c`~ti~U1RED : , . r z \ ~~z- tN ~ ~ ~ f { al „Za$ S~oro") t - (1t,6~6 ~ \2~N•/F~- b~ $ow ~~r:~~ = j r-~? i 2 T)o~~O~e gQr•re.l ~ryw~tls ~Z,o cf s ou} ~ S'Tot AG E QK~v tiDED ~ = SWa1e5 • 5 a '''-3 > ' A r ~ ~ •l . I J ~ ~ ~ T3R~'l~1AG~ CPt1~C1~! A~ lvrl5 5~~-~~~~ . lt W m SWALS `~F,'a'~[M~ta s AR~A ~~o F- A6 9 Is TDig ACE F-Ep.1J[F,SD M P.I LAF, iL.S . ~ r LaW ~ ~ ~ ~~~~'$~~Jl«~~ ° ~ ~ I St? ~ ~ ~ lo❑ 63\9~ i 11D t 1 ~ , L ~ 1 , l 3 i ~ ~ ~ ~ ~ ❑ m 1 • ~ ~j ~ ' ° ~ ~ I I~ ~ o' ~ ~ i • -i ~ ~ ~ ' ~ `t} o Y ` R E k < (1~d'yOV ~ - ~,19 13a ~ opO'1 1 S ~ 3,24❑ 1-35 ~~r ~ ~6e'~~S•`~`~ ~ya~ ti lt1 ~ ~ ID cE i . i - M1D1LoME ~AST 2ND AD~1-I'IDN 1283$ _ ~RAINAGE CALC.ULAT~oNS J ~ . 13~ ~ ~aszrnehz.. . . . - . ...-1--- _ -I - ~ • _ . ko~._ . _ . _ - - - - - ~ - - - L ` _ - S.S~ . ~ _ , ~ _Co-e - . `J'.---- . - - ~ . ~ - . , ~ ~ , , ' • ool ~ . • ~ ~ a • ~ 4 • t . , I: F / • ~ • • - • l ~ . . . . 0 1 . . . , . . e- y . FT./FT.. 3 `e- 51oQ - - ' ~ - 5 p,V3"1 Q - -Nor_Mq~ yyq~e..5~0 p - - - or onc. C.~.rb Swale Bot}om - - :i~~-~.s-..---- ~ ----3 ~i~~o•5~C4.2~~ ~ ~ Z~(o,5>(3.G4~ L ~.~g F-~? 0// ~ 4.29 _ 3. G5 l. o'► o. 9 l _ 6 _ . - . _ - - - . . 13 ~ . - ~ ~ . •/FT . 0 • , ~ - . _ - - . . . . . . . . _ . _ . . . , - • - _ • - • - • • - - • - • - .._.13, ~ as.p-me"t..- - - - . - -7 - ~ - . _ . . _ ' ~ : - - . _ . \ pl - - . . . . . _ _ - - - -Cop ot- Driveway- I - - - - o.s ' - ~ ~ ~ ~ ~ ` . . ~ • a - . ~f 0.0 I 6'1 F T. / . . • s _ . . . a . ~ s • • , ~ ' + . ♦ . ~ • ~ t + ~ n ' o ~ • +~(i!11~i!l.i~'i`iii/i~t yfi/i _ ' "'Y."_"' O• ~p . . . //~yi"\~!/~\f ~ ~ .iC. 1 Normal• 7 FT'/F.T.-- 7n'~`IrT.~TT~~u1r~~~~:Yl~~~.~• Fs.~,c . SWa1e.S'o . _ . . . ~~,5~~ . .~Cohc. . . Pe Swalz. RoTtont Cv,r1, - - - - - - ~ , CrosS- Sec~~ohwl Arew...cT Svrn.1,-- • 10 ~ - ~ _ . ' ' • - 0- ~•z9 c° t•9; ~~~10.5~~~.2.~t~ T ~ ~~~~.7~~1.93~~, ~ , i c.4b z..oo . ; ~ 1; I~•YJ . ~A Z ' - 3•55 f . _---/F~-..__.. o:b ' ~ . . - ' A• _ -t• . . . - - - - - _ - ~ - ~ pETENTION BASW DESIGN: RATIONAL FORMULA HYDROLQGY & BdWSTRING METHQD DRAINAGE BASIN ANALYSIS fot 10 YEAR STORM EVENT Qate; gH glgg Protect Name: Midilome East 2rtd Addition .lob No.. 12838 Projed Location: N 12, S. 34, T. 25 N., R. 44 E. W.M. Designer. K. MCMULKIN Dreirtafle Basin Name: "F" Disk Dir.: A1:lbowstrirtg Drairtage Basin Descnpticn: QnsRe Flename: 12838x1s '208' Ponding Area Name: swak For. Tomlinson Ponding Area Location: west side of vrgirria Road Potrrt of Concentration: E.R. 0+38, LL SUBAREAS TIME OF CANCENTRATION (Tcl, m+nums Descnption Aeres C A'C Overtand Flow Channel Flav Zaervious'208'Aroas; S2WmentA• L2 = 320 Asphaft Pavemerrt 0166 0 90 0241 G'tn 0.15 Zl ~ 7.3 Roofs 0276 0.90 0.248 41(A) = 0 Z2 = 8.6 priyeways 0.114 0.90 0.103 N(A) = 0.4 B. a Grass Lawn 1.045 0.15 0.157 S(A) = 0.01 n= 0.03 7C (A) _ 0.00 S= 0 014 QtherAtQes: d = 0.391 Seamertt B• L1(B) = 0 Tc (ch ) 2.72 N(8) = 0 Tc(A+g) = 0.00 S(B) = 0 Tc total 5.00 Tc (B) = 0.0 lrrtensity = 3.18 - TotalBasin Area, acres = 1.703 Composite Rurwff CoeRiaerrt ~ 0.44 Combirted (Area ' Runofl CoeHtaerrt) = 0.749 Q(estimeted ~d)= 2.38 c f.s. Time of Concerttratlon = 5.00 mmubes '208' ORAlNACaE PARAMETERS •208' Pavertterrt Aree = 11676 sq. ft. PEAK DISCHAROE, 10 YEAR STORM '208' Vdume Provided = 595 cu. R at 8' depth Stortn Storage P►ovided = 595 cu. R. at 8' depth Q= C' I• A= 2.38 C.F.S. sowsrRirvG cucuuAnoNs -F! s'1 fi aa ab ~€o tt7- NUMBER and TYPE of DRYWELLS PROPOSED Time Time Irttens►ty Q dev. V in V out Storage lntrrttM. lncmtM. 0 Single-Bartel (5pok2ne CourrtY TYPe A) (min.) (sec.) f nlhq (ets) (cu. Rl (eu. Rl (cu. R) 2 Double-Barrel (Spokene County Type 8) _ ($1'60) (A'C (oulf~ 4546) o':a6 .~~b .t'ib z. ~i ~0 Qb 35T Outllow Provided: 2 c.(s. o .sm 3:% 2.'3Fs 35f tiLz ZT to 600 2.24 7.68 1177 1200 -23 15 900 177 132 1328 1800 472 20 1200 1.45 1.09 1413 2400 -987 25 1500 1.21 0.91 1451 3000 -1549 '208' TREATMENT VOLUME 30 1800 104 0.78 1481 3600 -2119 35 2100 0.91 0.66 1500 4200 -2700 Requued GPA ponding vdume: 40 2400 0.82 0.61 1538 4800 J264 Impernous '208' Area x 12' - 487 cu. R 45 2700 0.74 0.55 1552 5400 3848 volume provided at G deplh o 595 cu R 50 3000 0.68 0.51 1579 6000 -4421 OK! 55 3300 0.64 0.48 1630 6600 4970 60 3600 0.61 0.46 1690 7200 -5510 65 3900 0.60 0.45 1797 7800 -6003 70 4200 0.58 0.43 1868 8400 -6532 75 4500 0.56 0.42 /929 9000 -7071 STORM STORAGE VOLUME 80 4800 0.53 0.40 1845 9600 -7655 &5 5100 0.52 0.39 2025 10200 -8175 Mawmum storaye requued = 357 cu. R. 90 5400 0.50 0.37 2059 10800 -8741 votume prowded at 8' depth = 595 cu. R 95 5700 0.49 0.37 2128 11400 9272 0 K! 100 6000 0.48 0.36 2192 12000 -9808 Slmpsoo Enqlr+eaa, lrtc. 909 North ArQonns Road, sspo+ccene, wa 99412 (309) 946-1322 aa . ~ Stormwater Drainage Report U. STORMWATER DRAINAGE CALCULATIONS: (continued) Basin F Curb Onenine at Low Point, Sta. 0+433, right, Virginia Road Curb Inlet 96 h= 8 in. = 0.67 ft. Total height of opening H= 0.108 ft. Depth of water at entranGe Q= 0.28 cfs Total peak rate of flow Q= 3.087(L)(H)32 for H!h < 1, 0.108/0.67 = 0.16 < 1 L= Q=(3.087)(I-)3R = 0 28 =(3.087)(0.108)31 = 2.56 ft. Construct Curb Opening; 3 ft. wide, 8 in. deep r ~ a RATIONAL FC]hMLlLA HY[}R[7LOGY ❑RAINAGE 6ASIN ANALY515 fvr iQ YEAF! S'fQRM EI1ENT ❑ate: 91161W Pra}ect Name: Nfiddome East 2nd Adddivn D"n Sswr€y Project 1Vwmter 128M agk Fiie ai•a,alior,ansvAI 2W8 3as Site Loc-aban: N 1f2. S. 34, T 25 N, R. 44 E W.M Basm Name• F. Basira Descnpbarr Virgrnra Road Roint af Concerrtrahan: Sta. 9+SG, 18' Right o++3 _ SU13ARFJ#5. Intensity-Duratton for 10-year Storm Event Descrr~pt:on • Acres C A'C , Time ime Intenstty Incrmni Incrmnt Pavement O.097 0 90 0.0$7 {min } (sec.) (on Rir) [Wsa} 500 300f74 318 5 300 318 la 600 224 15 900 1 77 ZQ 1200 1.45 25 1500 1 21 30 1800 104 Total Basrn Rrea, acres = 0.097 35 2100 0.91 Camposde Rur¢afP Ccefficaent = i} 9m 40 2400 0 82 Combined {Area' Runoif Coefficient) = 0087 45 2704 74 58 3000 068 55 3300 0.64 50 3eQE} 061 TQME (3F COiVCENTRATI[}A! {minufesJ- 55 39(?OP 060 70 4200 ❑ 58 Tc (QVerland Row) Tc (gutter ffaw) 75 4500 0 56 so 48)0 053 Gf = D.TS L2 = 143 85 5100 052 Z1 : 36 90 54(]a 0.50 L1(A) = 18 I2 ; 0167 . 95 57t1t3 0.49 h!{A} = 0016 B- 0 t[Xl 6040 048 S(A) = 00278 n= 0016 s ~ aai rc (,a) = 021 d= 0.1 aa L1(B) = Q Tc (gut•) 1-88 N(B) = a Tc{A+B) - ❑ 21 S(B) = C] Tc totat 500 Infensrty = 318 PEJIFC DISGliARGE, 70 YEAR STORM. TC _ 00 HQlding 5 24 Q=C'f"A= 0.28 C.F.S. 0 (eshmafed @ d) = 0 28 C f 5 Tirne of Concentratian = 5.00 minufes F - sa~v.sms- ~ •d ~'sx . . , , MVDtLvMe 1~AST 2"° NIDDizInN D94,1N+AGS CALCULATIVNS $ ~ . kRe A r 3ta 0.9Z56 a~re 't D'T AL YAli T. ~ 5!~ ~ [la~ '35Avs rA uE (7--14~1 (sc~ ) W vav l~AwN D?Lt.vF- i'` 'D Rdv~s ~ 3 0v Dr~,je IzeID[3o 3o d00 Tit. olGlrte- Roa~ A le•a~~KvsouS ~ 'l1 ~F-lo + 3 tac7G+ ~ 3 Q ac-t-e- "~o~ S~~ro►ge ~ ~Il,~~v rt~~~ ,~4 - ~ ~`~'S b} ~o \o s-tA3 -Dou~l$ 56,Yre[ UrjweA (G-445"S14rt3f (1.0 JS DU+) _ S P~ y 4'L~3g' ~ JA1D 1L 0 tA S ,ADID tTi 10 c-A ~ DF-a►NAGE C-~LC.uLKr roNS ~v4 m S P+s 1N Tt'PYS'MSNi NFSA `iLo$" 5'T aK A (S E 5-To?-A4E ~EQ UIR e U AYP~lLNBLF- f~~ T- 0 ~ ~ 53 fk.3 F~3 M}([8'} ~ 1-z ~3~ ~f ~~~'}~l•~8 F;•`) ^142 FT,} ~ w S~. ~'r ~105'}~,~~ ~ 1,B9v_ _ ~~•~B N 13a v ~ ~ 2,-4 4~ FT ~ ~ 00`1(z° ) = I,ioo ~3$~}{7- 6 4 ~o o v G5 2a _ 11 IS-10 4cl G ~ 13 fIr. ydt 'x . •v.#'*#' ~ -'`T~li," • !C• . , • ~ rC.L." 7 . . , ` - ~ fF . ' ~av. , .e ~yFe-svn . Y ~i~ r ~ .t if ~ v~ P~P s ' • ~~€~~~P~~G~ CA~.~.~~ATIc~N~ ~ . - - - • ~ . . . _ _ . . - - - - - - - - - ~°s~.~n{~_~~,~~~_::`.r_~~ _ . ~c~5~~r+en'~ I - - _ . . _ _1~` - - - _ : 6'5 - _ , - ,Ti O~~O~i UriV e.W Q~ + 'e _ ~ - D0~° R „~i~~L _ ~ ~ _ . L . a . • - y~I~~~ I • ° ' ' ' ` yf `,1~~ ~ _ • o , ' r , - I _ ~}.f" ~ i 4 . . . . . . ~ ~ r . . _ fiLL~yiy,v ~ f!: n ~ r , T " Bn~~awK anc~ S i ~e~+ulk ` 1 . ~ 1 b ~ ~ _ ~ _ ~ 10 ~ t\►r eol Q~T . - . . - , ~ ,~..~j - - -r --OD - __.'s z.L ~,GB - ti . Y . a-~~ _ _ ~'`Z-___ _ ~•~yE • _e~w.,_~u.~__~ . _w~_... _ - • - ° a - - i - - - _ • - • - .T.~ a3~w►~.4i _ - - U _ . - l,5 6.5~ Zpp cs~ 'C+~s'iveW~u~ ~ ~,n~s"~• - - - - _ ~ - ~OD~._ ! ~ ~ _ . ~ ` . . . ~ • . . ~'1 ~ ' _ - ~ • _ t ~t . . - - ~ ~ ~ - , ~ ' - ~ _ _ _ ' ~ ~ - - A~~ w a'1 e~ B a-~t onn ~ ~vnG. ~uhb ~ ~ - -11 - - - -.~1. _._._w....i~• ~ ~ - ~G---- _ _ . . _ , ~ ~ . . _ . - ~ - . i~•-...,.•:~~~- _ - • • _YS.. ri ~.;G' - - ~.',i~~ : i•, ~~'"^M, =H'~aEp'd# v 7u:~ek7ektsx t xlnaes~ .:c:r v. e~ ° ' °.,~c+~'+: ''~ri ' ynR, r~''~.~1 ~ -f ; . ~Y~.}": "f . . ` . . . y~,'~~{~". _ ~~~_j~ , , _ 5 , •1~~~1+d~~ ~~5~ 'DR~~~~~~ %-I L.NYi t QN s . • _ i - - - - • • • • • • F-1N - • - - - _ - - • ~ - Ci. ~ +fY1 ~Y1~i - • ~ ~ • - ' - ' - `~ti-- - . - - ~.~'a', ~ ~.s! - - - • ~ ~ - ~ ~ - ~ ~[o~ p'C Q~1~ILF1LlL~~, _ 1~ ..r~`rr►~ JJI..~~ii.,~. _ pp~ ~.DO~o~ C~~1~~• ~i~ff~ ~ ~ . ! s, ~ . ' _LJ. ~ 4 ~ G • „~~'IJJ~`1 ~ r`~ ' ^ Y ~ G~ ; l ~ - ~ • ~ j{ + N qi ` T. / F rt . c►.l - ►~.~Cvmc. Curla - S w al e. 3 o'~'r ~~v+ - 5ecjs.~v~o~l - _ _ ~ _ s.~' _ ~ ~ ~ ~ _ _ _ - - - - - - - - - - - - Y y t ~.Z.~fiD o-9l p`'6,~ _ . T ~ ~ o ~ ~r ti • . -ti_ - - - - 5p _ ~ . ~ ~ , ~ - .a.~ - ~ ~ ~ ~~l'~yrr~E~~~, 1 0.016-7 F'T.I~~. t- _ ~ ~ . ~ , , ~ a - • 4 . . s - ~ ~ - , • a t • ~ , ri: f, i,~.ll~~' , - ' ~ ; O' ~ ~ r ~ ~ •~I1 J 1 ~ ~ Q• 1i~7 . ;•~~~'~~~~~y~r.y~~~ ► • . ~ ~~-1~- , , - - - ~orrri~l ~r~-- - - - .p?-~'~~-' C~s~nt. Pe Swate~ t C) ...L - - ~1~~' Yy~Y ~L~~1V*aaAl Y• 4-~ w ~a1h+~ E~ t L0.5~ (,k.Z9) -----$~-~~dl~r~ _3~~ F}~ . J 1 i ~ . Y OEZENTlalal 8145I+1 {3E'SfC14: FG4TTpNAL F[)fdlViLiLA FfYC3FZQLOtyY 8 BCWSTRIhK3 MET1iM C9FtAfNAG£ BASIM AIdA[.YSE.a f6r 10 YEAit STaRM EVENT Date: 8121►sa Propar Nafm. ~ilom €ast arkd ndafflm Job Nn : 12$38 Prcject Lacatian: N 9f2. 5 34, T. 25 N.. FZ 44 E. W.M []esigroer: iL [MCMULKIiV O€eirage &asin l+ame: 'G' Qis[ Chr : A1Abowshing Ora9nage Bawn Dw=mbon. OrsGa FMrtarhe: 1$838-,ds '218' Pvrtdin9'Area I+latne: swale For Tornkittso, Pared7ng Aras LocoWn: ssuth sKle of 35th AxemsQ Pvirrt of CQnoenbatlan: 1_F 9+50, RL SCIBAi{EEPS 31ME OF CDNCENTRAT[ON Cfcl. mirsutes [3eSCrimion Ram C A'C [7veriaro Flow Ghanrref Flaw r~~ ~AUN.: sea,,,ft-irA: L2 a 290 Asphait Ptrement 0273 090 0245 Ct a 0.15 Z4 = 7.3 Ra+is 0.4769 0.80 0.062 L1041 - a 72 = 8.6 Drkvwap 4.069 0.9D 0.062 N(A) ° 0.4 B= S Gmss E..awRr 4515 0.15 0.077 SCp1 ° 0.01 n ffi 0.03 Tc (A) ~ Am S a 0.419 QffwAlres: ¢ = 0.304 BsvnmofB: Lt (6) = 0 Tc (r.h.) 150 ' N(B) = o rc(A+S) = 000 s(B)a a rC totai 5.00 Tc iB1 ° 00 IntemsrtY = 318 rota► 8asm Area. acm a o,s26 CcmPosda Ruaooff Cnefficierrt = Q.48 Combined (Am' Rurroft C4dlicisrs) ° aA47 Q(Gsdm~ed ~ d) ° 1.42 cis. Tirme of CwKmrrhaban R 5.OU rmrrtrbes '208" DRAFNAGE PARAARETERS '208" Psvemen4 Area mm 11370 9q. ft. PEAiC OISCHARf3E. 10 1'EAR ST[IRM -20W vols,me Provided = aaa cu, tt at Ir dapn stor►, straga povdad = 713 nof s- deptn Q_C' 1• A= j.ax c.F.s. SMsrRM c,ALCULnTKM f, fi aT+1 & #ti Ir- NuhABER and 71'PE ai DRYVVIE[.LS PROPOSEA Tme TirM Irwfsiry Q dsr, V tn V att St4raps lnermret InamrrL D SUgla-Bamel (SPokm" CaurilY TyPa A1 tmin.3 (sec.) (]nA%r1 (cfs) [cu. tC) (cu. ft.) (cu. R.) f ooubl&earref tSDokw*C&4* rrRo e1 fA'C'i~ {~}f~ {~.~8) a7~ iww J"!5 ti. O"7°~ Oudlawr Provkiod: 1 cS.s. a im s:i& t-M m :Az 27r 90 66 224 1 .00 702 606 102 13 900 177 0.79 792 90E) °108 2Q 1200 145 0.85 843 120D .W7 25 1500 121 0.54 aw 3500 -634 `2W TREA7MF.N'f VOLU14[E 34 18tJ4 104 0.46 883 48Da -817 35 2100 0191 041 as 2100 -1205 Required G.RA pondirfp vokuns: 40 240fl o..82 037 915 24+0Q -1484 Itr[Pema+3 "208" lmx 10- 486 ou. R 45 27170 0.74 om 928 2700 4 T74 vdase providedet 6dep#1 m 713[u. fi 50 3Q00 [].88 Q 3D 942 3000 -20.58 OK! ss 3300 0.64 nze srr 33Dn -2328 60 36M 0.81 427 1008 360 -2592 65 3900 0.6[1 017 1072 39flQ •2828 70 4200 0.58 4.28 1114 4200 -30A8 75 4509 0.5$ 025 1151 45D@ 3349 3T[]RM STORAGE VOLqJAAE 80 4800 D.53 024 1960 48dIO -1840 €35 5104 0.52 0.23 1208 5] QO -38S2 Maxdmum smage re4Wred = 271 tu. R 90 544a 05D 022 1229 5400 -4131 vattstre Fxovwed at S' dsplft ° 713 cu. it 95 570a 0.49 0.22 i aTa 57o0 443D OKI 10n mm 045 a.a~ 1308 wva -4692 Skwsm Frromem !►v- 909 IIFarth Aruaure FIIOe4 SPckwp% WA 942l2 fbO1 920-1333 n c,~ : .,a..+ ' . ` t r; _ s ~ r Vsr1~~?~~ ~~ya yi=f~ 41 L_ c Stf7T311Water DI'31I1~~~ ~~ort II. STORMWATER I}RAINAGE CAI..GULATIONS: (continued) Basin G Ctlrb fJnening, at Low Point, Sta. 9}50, right, 35'h Avenue Curb Inlet ##7 J h = $ lll. = ~ 67 ft. ~~~al he1g}It 4f oPenliig H~ 0.094 tt. I]epth vf water at entrance Q= 0.23 cfs Total peak rate af flaw Q= 3 087(L)~3"1 for HIh < 1, 0.09410.67 = 0. 14 < I i.. _ ~ ~ (10$7)(W' 0,23 = (3.087)(0.094)32 =11 ' 59 ft. ~ Construct Curb [)pening, /ft. witie, 8 in deep ~'~f . . , . . w"-~"'~' ~.I',~„~.•f,~~)1!~`+~'~•- 't;"~ :.",f~~'Nrf~!;r~•.~ .d§'`a ~:...r.' . , i:~"•,~!!~;i~~,~,~''~..k ~ Afftk RAnC11WqL FOlTMLJLA HYDROLVGY DRA11dRGE BAS[N A1+IALYsiS far 10 YEAR S7QRM E'IIENT f]ate: 9116/98 F'm)ect Name. Middame East 2nd Rdditinn , 4?esign: kwrrs Rmjed IVumber: 12838 ChskFkr a1 Vatxm2A1cniaS3a-,as Sda Locahan: N 112, S. 34, T 25 N, R 44 E. W M 6asin Nams: "G° Hasin Descriptian- 35th Avenue Paint ot Gancentratron. Sta. 9#-50. 18' Right SU6ARFJaS. Irrkenstty-Quratton tor 10-year 5t€um Event d7esenptton Acres C A`C Tme Time Wensdy Incrmnf. Eftcrmnt. Paverrrerrt 0.081 tl.90 0073 (min ) (sec.) (€n fir) (wn•B03 500 300.00 318 5 3[d 3.18 10 soa 2.24 15 900 9 77 20 1200 145 25 15W 121 30 1800 1,04 Tofal Basin Area, atres = 4.081 35 2100 0,91 Cnmpasite Rotrncrff Cceffiaen# _ 0.900 A[] 2400 0.82 Cambirsed (Prea ' Runoff Coeffwierrt) = 0073 45 2700 074 50 3000 06i3 ' 55 3300 064 60 36iJ0 061 TIME OF CC)NCENTiAilO1W (minukes): 65 39W 0 60 70 4200 0.58 Tc {odedarrd Rowj Tc (Bu[ter ffaw) 75 35M 17.5f'i 80 48(x] 053 Ct = 015 1-2 ~ 104 85 5100 0.52 Zi = ss 90 5400 050 Li{A} _ 18 7-2 = 0.167 95 sioo 049 N(A) - 0.016 B= 47 100 6000 0.48 S{A} = 0.0278 n= 0016 s 3 00149 Tc (A) = 021 d= 0.094 L9(8) = 0 Tc (gut.) 119 rv(a) = o rc(a+a) = 021 s{$a = ❑ r~ tOtEd s.oa frtensity : 3.18 PEAK D1SCHARGE, 10 YEAR 3TORM: TC {B} = 0.0 Fkolding 3.71 Qa C*I*A= 0.23 C.F.S. Q (esfilfrided @ d) = 0.23 C.f 5. Trre af Concentratm = 5.00 minutes ' G ~ __D?-A1NAGS CALCC3LAT1vry.s 1~'°►'1N~ _ s P's I r4 " VA TAVT- 3~.~`~ E.erti~~. 5~m6.g~s }o ~`lG•$¢ ~ ~ 1 r ~1hr~1'h1~ '~atxd . [i ~r l'a t+9 3.t 89.a 4 ~ ~ es'f 1A $ 7-o')(4~3F j ~ LZ~0'~i+ ~ ~ y, w S 5 'D'r ► d ea a 7- 3y nD ~ i.,L 0.0681 G1 Ct' e t71C i V ~ # ►~~~t~d~~~ s ~ ra~As~ r- 930200 2-9,6-7~ _ ~a3, 57-+ 1.~}~~~ acre. a►reas ~av.sid~rcc~ a3 ~ev+~lv~e~ r~~.ss`~2 ~+r~c~ . a) ~k~3 $ aW ~~r►y~g ~ A-43 Z '$myr el ~r~w~.44 s f~22 ~i . '&~^aac~i~rrs w~rr~t . - . r• a La s G ~►ttv~~ot~r~ o~ k?,SA NIy ~ 4~~ 5 W A L~ 5,ToR,AGE 'S ToRAGE r- S Q~t T. Sb P4~A1l.M3 L~ ~ _ ~a~`}~~~~ - 1,~~~ f~? ~~t ~~qv'}[1•~a l-~$ ~'~3 2, t 4G~ s'1 (65' ) 6,95 y 3t a ~~~3`~~►~`] ~ (~~'7~~.~~ ~~3~ ~ ~~4 ~ 5,1~v ft.,L -ZA-d ~-k3 P , 1, 530 3: ° 3,~4c~ ~t~ 133 3 ~°br`}~[ 8 F~~`~ ~ 1L l U- C7 67-~6`~~ 5Zg ; . ' ; ~ , • ei-. _ ~.7 : v _ • ' - _Y , ,r ~ . j , , . . . , .i _ - _ • i - ! M1171L.aMe SA~ST -z"D #,DDt"C IDN 12 93 8 ~ A-FA1+~N(IP- cALcuLA'TtONS .r___ - - - ---~1~ - -~W. _ _ _ _ - • - - ~3~ - ~as~rn - - - • - - - 9.5~ • I ~f.5' - ~ , . ~apw o$ 'Driv ~w'~tJ _ • --._•-_e--- - . ~ _ ~ > r.J,+r~i.~ ~~1., ~ u~_ z ~ ~ r - ~ ■ . , ' -0 ~ . , . ❑,G]tt~u`3- ~=T./~~ ~i. ~,°'1I11~1 ~ . • ; y ` ~ ` . e l • ~ r .n i 1 ' • ~ • . ~ ~j 1 FT,"..~~~- s1o?~- - - - 5!ycklE.SIc~F,e C.arb . . ~W0.~L'. ~F7~~C3YY1 • - • . • - - - , _ _ ____'~~w • • -.r_..-L a __.d.-•-~.-_ _ _CY 0 S S ~ ~ C"'r 1 D h~, i P_1!~:..~~__~~~.~ftif 0.~£___ ~ i.4.9~ .3.G5 O.`41 . n'1~6° ~ Y~"~''~_ _ - ~ - - • . • ~ ? _ 0 _ • r..,.~ . . _ . • _ - - - _ • -,t~,.-------- _ a - - - - . - - - - - _ - _13 . ~ a~5~m~~'~-_- - - - - I - - _ • _ - ~p~._ - - . • - - ~ - U['iV~W~I~`-~. - ~ a - . ~ .r~rl~.:rrrti,~- - . _ _ ~ ~ ~ ~ ~ ^ - ~ 5 ❑.f]t c~ ~F 8. ~ • . i = . - . . ~ - : . - , - ~ , . - ° • . a - I a • • . , I ~ a Q E _ D ZI rc~ ~ ~~'~~T,~~~~,~~f ~ = 1~~''1~`A`~ o ~ i~~~ ~ ~,~.~r~C. 6....._ SIo~e--~~.------ ~ __s,~ ~ 5wa~~ ~~3~~orv~.J_.. _ C:•~.rr1s C r~~~ - ~ - - ~ = _ _ ~ • - (4r.0) -2-00 Fr~. ~ • p~- _ n'y~'~---- ----.w_. _ _ - , -~3•55 F'[. ~:,r=:~°,:. . . . , • , - ~ . _ - - - . , ' _ , -n . . . _ . ^ - r 1 . . _ . ' . . . . ~N BASIN CIF-SIGN: ~~~MULpl ~LOGY & WWSTR94G METI-100 QRWNAGE BASIN RNAL1'SIS far 10 YEA12 ~"JTQRM EVENT [}aSe. 8f18198 ProKc! Narne. hA"idikxna East 2nd Ikddfflan .hiE Ffo.: 12$38 Projec! Lnca6an: N"tC2. S. 34, T 25 H.. R. 4+1 E. W.M. ~ Desiyrier K. MCARULJQN [7ra:nage Basin Natne: "H' L]islt oir.. A1:bowstrM 'f3rartaSe Basin Destr4ition: Qrsft FWnmm: 1 Z838.xds 72WPordinglPuea I+kame: swafe Foe: TafnGrman Pondin9 Area Cxatiart: east side at 4r€Wnm Road Poin# of Concantrafion: E.Ft 0`38, RL 5U8AREAS 7tME OF COfJCENTfiATIOAF CTcl, minutn oescrrtmon !cm C A C c7r8Ftand F1aw ChanrdO Flaw LMnerypLp '208•$MK 3eu~er~a4.: L2n 350 Asptmft Pavement 0291 0_913 0.282 Ct p 0.15 21 a 73 Fioofs 0.321 090 0289 L1 (A) - 4 Z2 = 8.6 DrNevrayg 0.069 0.90 0.482 N(A) d 04 aR 0 Cafo'a5 LMMM 1458 0.15 0219 S(A) ° 0.01 1! a 0.03 TC IAf ° 0.00 S 'a 0.012 - pywp,reax d = 0.419 Se~psrrl' B: L1(9) = a Tc {ch.} 307 N(B) = tJ Tc(A#B) ° 0.00 S(8) _ 0 TC fotal 500 Tc (B) = 0.4 Qrtensrty = 31$ Tatal Bawn Area, acres a 2.740 CcmPosft Rur►ofif Coefficisrrk = 0.39 Combinad (Area ' Rurof Caaffkiant) ° 0.9m 0 {ashma6ed ~ d} ° 2.65 c.f g. 1`fine af (:anoorrfttion a 5.00 msnutn •20s- oRAINAcE wARAuMRs -zW Pave„arrt Ama - 12676 sq, rL PEAK nrscwaRcaE. 10 rEAR saQRM '2W Vaknne Hrwided - 622 c.t. ft at 6" depth 5tm &Iora~e Ptovkiod m 6I2 r.u. tL at T +depth fl =G' I`A m 2.65 C.F.S. Bt3Vffi5TRING CALCUL.A7[C7N5 ~s 95 94 ~ ~ ir- NilMBER and 3'YPE ot DRYkIVEG1.S PRQROSEO Tims Tlrne Irt6snsdY Q dev. V in 1d aEd Stome rncmnt inerr,rrL a singlaZamel (spakare C«,W rrca A) {rttur.) *5+sC.1 (m~) iA'~} (cse.lt~ ~ ft3 (cu. R) 2 Dm~ie-Barrd (+Pa~e ~~Y TYPe 6] ~ 1tM wiu.uu ~w OilftM1AI PrpVxiod. 2 Cf.S. :7-% s+'90 M m iw ta 600 2.24 1 .aa 1308 1200 100 15 sou 1.77 147 1475 1800 -125 20 1200 1 45 1.21 1571 240D -M 25 i 500 121 1.04 1613 30Q0 °1:I87 "2W TREATMEEdT VOLI9ME 30 1 BE10 1.04 0 87 1 Bd8 380D -19.5d 35 atoo 0.91 0.7e 16e7 42M •z= RewbW cPA. a~ing volwme: ao 2400 0.82 068 1707 48aa -XIM tmpwvims ^2os- Asa,c irz• _ 528 cu ft 45 2700 0 74 0.82 1725 54Q0 -375 volume pmrided a1i Er dapth m 622 cu. R. 50 313DU 0.6e 057 1755 ww -4245 tJK? 55 3300 064 0.53 1814 9EQD 4789 5Q 36pp 0.81 051 1818 TLaO -5327 BS 39[)0 m.60 4.rs0 im 7804 5802 710 4200 0.58 6.48 208 S" -6324 75 4500 0.58 047 2144 9DOfF -aBSB STL}RM STORNGE VC3LllME Fip 48t10 0.53 @ 44 2161 96DD -7439 85 5100 052 0.43 2258 imm -7950 Macsmum stora{;e m4wread = 463 cv. R 90 5400 0.50 4.42 2289 1080D -8511 vduffm prornded af r depth ° 622 cu. R 95 5700 0.49 4.41 Z365 11400 480:35 QK! 1 Q4 mm 4.48 040 2437 12000 -a83 Skrwsm ErrghroraL flrF. 909 Afcrtlr Argartm Rav4 SpOkasre4 iFMA 99212 MO) 826T322 e• . . ~ ~ •~,yL~d~/P,l.: ~'i , . e' •_~+K J' "r'~:_.^.`++ e p,• • .t . '.1";..y~ K~ A. +4 ~ Stormwater Drainage Report II. STORMWATER DRAINAGE CALCIILATIONS: (continued) Basin H Curb Onenine at Low Poim, Sta. 0+43, right, Virginia Road Curb Inlet #8 h= 8 in. = 0.67 ft. Total height of opening H= 0.105 ft. Depth of water at entrance Q= 0.22 cfs Total peak rate of flow Q= 3.087(L.)(H)32 for H/h < 1, 0.105/0.67 = 0 16 < 1 L = Q = (3.087)(I-)32 = 0.22 = (3.087)(0.145)32 = 1.90 ft. Construct Curb Opening; 3 ft. wide, 8 in. deep Curb Oaenins on Continuous Grade, Sta. 6+10, left, 36'h Avenue Curh Inlet #15 a= 2 in. = 0.17 ft. Flowline depression at opening y= 0.08 ft. Depth of flow in normal gutter Q= 0.11 cfs Design discharge Qa/La = 0.054 From Fig 16(a), page 6-39 "Spokane County Guidelines for Stormwater Management" L= Q/(Qa/La) = 0.11/0.054 = 2.04 ft. Construct Curb Opening; 3 ft. wide, 8 in. deep I . ; RAT[ONIaL F❑RMIJEA F11'DROLUGY S [3RA1PfAGE BASIN ANALY5IS €or 10 YEAFZ 5T[]RM E1lENT aate: slasm Projeet Name Midhfonse East Znd Adfdiitissn eesagrs: kwm Project Numbes: 12838 Chsk Fle, A1 1rw=afti 0112838.x1s 5'ste f ocatian: N 1/2, 5 34, T 25 N., R. 44 E W ht1 Basirt Narse: H. gasin Desonptian Virginia Road Pout ai Concentratsan: Sta. 0+43. h 8' Right SUBAREAS. Inteerstv-[3uraborr for 10-year 5tarm EVent flescnption Acres C A'C 7"ime Tima fntensrty Incrmnt Incamnt. Pavernertk {).078 0.90 0.069 {min.} (sec ) (m.lhr) t01-M 5.00 30000 3.18 5 3£]0 318 10 600 Z24 15 5D7 177 20 12DO 145 zs 1sDo 1.21 so IBW 104 7ota! Basirs Rrea. acre.s = 0A76 35 2100 0.91 Ctsrrspasate Rurmff Coefftctent = 4.9m 40 2400 0.82 CorrsbinW {Area ' RunofF Coeffikae~sk} = 0069 45 2700 0.74 . so 3000 0.68 _ 55 3300 064 E(] ?600 05'! TfME s7F CONCENTRAT1qRl (tnirsutes). 65 3900 0 60 70 4200 {158 Ts (avedand ffaw) Tc (gutferltaw) 75 45M 056 8o 48[K} 0.53 Ct = 0.15 L2 = 97 85 5100 0.52 Z7 = 36 90 5400 Q.SE? L7 (A) _ 18 Z2 - 0.157 95 8700 0.49 N(A) = 0.016 B= 0 100 6000 0.48 5(A) _ 0,0278 n = 0.016 s = U [10T'I Tc tAj = 0.31 d = 0.105 L'!(B) w 0 Tc (gut.) 144 N(B) _ 0 Tc(A+B) • 011 5ia7 = o rc total 5.00 Interts[ty = 3.18 PEIKi 4I5CHARGE, 101'EALR STDitM: 7c (E3) ~ 0.0 Haidmg 3.46 Q = C' I • A ~ 0.22 C.F.S. Q (esdmated @ d) = 022 c.f s. Time af Corcentatton = 5.00 rninutes N ~xtv- C.~. Yr• ~~~~~\r:fr% Ni. . ~ r r - r : 1~ . v 4 ,9". ° v i ~ .•y n-1F'rµ-~c'i R'Y r y F =':t~u,.2r,~' IDRR RATfaNAl. Fc3RMLlLA F{YDRQLOGY ❑RRIIVAGE BASIlV ANALY5i5 far 10 YEAR 5TORM EVENT flate: 911EM Praject Name: NlsdilOrne East 2nd Rdditan , DesigR: k1MY1 RfO}8Ct NWrttbE.Y: 1 283B OiSk Fie. A1 SraEonaAl l7512838 )cls 5de Lcumtson N 112, S'34, 7 25 N. R 44 E. W M. Bamn Name: "H" Basin Description 36fh Rvenue Foint of Canoentradon Sta. 6+14, 18' left 5UBi4REA5 Irrtensitv-{]uration for 10-year Storm Eveni DesertphQn Act'es C A'C Time 'fime Irrtensitya Incrmnt. inermnt ' Pavement 0 037 ❑ 9D 0033 (min ) (sec.) {in.Ihr) [a+'~] 500 30000 318 5 3(]a 318 10 600 2 24 _ 15 900 1 T7 20 12i30 145 2`' 1 500 7 21 30 1 800 1 G4 TQhal Basan Area, acres = ❑ 437 35 21410 091 Composte Runaff Cnefficxerrt = 0.900 40 2400 082 Comhined (Area' Runaff Ccefficient) _ 0.033 45 2700 074 _ 50 3000 f} fi8 55 3300 0 64 60 360(} 0.61 ^ TIME QF C4NCENTRATfON iminulesY 65 3900 G.60 , 70 4200 0.58 Tc (ovadend Aow) Tc (gut#ar flow) 75 45[If} 0.56 80 4800 0.53 Ct = 0,15 L.2 = 90 85 5100 0S2 Z1 = 36 50 5400 0 50 Ll (A) = is Z2 ; 0.167 95 5700 f].49 iV{A} = 0016 8= ❑ ' Z0Q 60DO 048 S(A) _ 0.0278 n= 0016 s = a.OO77 'fc (A) _ 021 d = 0.478 L1 (8) = 0 TC (guE•) 1.fia N(B) = 0 TcSA+BJ 027 S(B) _ {l Tc total 5.00 Pr►tensrty+ = 3.18 PEAK DISCHARGE, tQ YFRR SZORM: rG (B) = aa Howkm 3.21 q=C•1•A= D.ti G.F.S. +Q (eshrrated @ d) = 0 S 1 c.f s. 7ims pf Corxentrakarr = 500 minLites H1 ~-7 -es ~ ,~r ~ - ~ ~ - - - - 5~t7~~~ "r, • _ . r':3 i~~~(.-~'r ~ ~1~~''~, ~eafiF ~ • - ~ - - ~ ^ " $~r~'~. r f7EPTFf nF FLOW - y- FEET .as .02as T•o+ os aB a .ta .0 .a .4 s 6 ? .a 4 r.o ~ ~ :'s",R i p 10 ~ ~ .s ~ ~ i L ~t 4--l -1-T -44 -1 I i ~ ~ I ~ 1 L-I ~ ~T I ~ aa . 4 t 1 c ~ oe Lt1 ~ _ I L1 I I~•'ae , . . s f~_ i f I ~ I'" i -ns ~ I r I d i " ~ ~ I i .04 03 .02 I I I ' ~0 t o y 615CHARGE PER FQQT aF I ~ a/V~"~-,. LENGTW ❑F Ci]RB dFENING ' INL'ETS WHEN INrERCEPTiNG 10]0°o OF GUT'TER FLDW t 1 (b) PARTiAL INTERCEPTIaN } - - - ~ • • ~ I ' ~ ! i •.3 G RA71O FOR 1NLT ❑F Q r I rLENGTH LESST ~N La I ~ s ! ! ~ ~ ~ ' ! •.2 ~ I oe 10 ua .c~e ge s~a .z 3 ~ .S s e !.a L/Ltl CApAC1TY f]F CUR$ OPEtV1NG INLETS ON CQNTifIff3O1JS GRADE 6-39 FIGURE 16 . - . ~ , . . - . W ~ ° y ~ ' . C , • - ' ' ' ~ ' . , _ T, l'L~ 3 O _ _KtVU. o MIle S A5 T t AIDDt 'T r ON - - - 5 ~ i ~ ~ ~ 8 ~ - --DRA.IOAGS _ _ _ - - - _ _ - - - ~ - - ►~+.'~~GA r (B 45'} (9l0'~ (5v') r 33,115 ft.7' ~ D,766Z Z~'TbL ~ ~ _~ORA~+GRWh yJ~l`h~~ : ~ t~pr ~N\I I ' 3~T~ P►.eer►w~ : ZtSo $o "lt 9~_8g - ~1°~a`~~~° ~ t ~54~'~~tig`~ ~ L~~~~~ ~~y 0 .3D A S 0,~.r~.. ~ DRIVca 17~rive- s Q l,'C1~i]O itL Q-kGl}l &\CrE„ o - . ~ ~ 13 Z (eU 0 10 i~ D z 1 MY ~'[z°~ tiv+u 5 0.1913 acre v AS, ~T ~C ~]~r~'sy~~ n.re.~, ~.~~.~~~~r~a rnegltig►b~~ , aKd i+n~.l~d~~ as ~~.v~.1~~~~ oY+.s ti ~ e~ wr ea. . S#ar~gp- J5 o ui) : - _ , ~ . . , r : ~ ~ t • ~ ~ ~ ~ ~ , 4 . •w ~s'. ~ , . . . - ' ' a - f'- M - ' _ ` ~ • ~ , . , • • . x~ 8 vr~e _ ~AS~ ~Z..~ s y- wm Xs 1t11 ~I l~e'eV'~ME~1~ Afk'EA ~ ~~gy 5WdA1..E 5`C o¢ A~ E , 0 I~ P► C~ ~ . R'~GtUIR~D AVAk1 P1BM1.~ 1 3 I • `t 8 ~T. . ~ -7 9~. f 33 ~ ~~~F)~~•~S F~ ~ l~~ ~ 2 ~8~`~~~~') ~ ~,44~ ~v ~r.~ ~~~~~1.~~ l~ l ~r~,~ w P}. ~ Ty~ (~zs~~~~$''~ ~ ~`53~ FT~' l~~ ~C~-~ ~~1'a,`}(1.~8 FZa`~ l$~- 'F~C: Z°I~ f.T2 33 ~~(-~)h.q$ ft.,~ 1tl ~ d ~ - G f T? 190 Ao o VITi 1-1 _ z~-17-6 fl' 9`7 - _05.11' Yt-9B f T:L) - - - - - - ~~•°t~ ~ , ►3~ ~ , a~~. ~ ~ • z.q ~ ; R ~ - ~ f . •~+Pi ~ , _ _ `eE - S ~ Y ~ ~ NI I~1l~dN~~. ~~'►5"~ ~~D _A~t]1T t ot+l - - M83$ _ ~ ~~P~tN~►~C+G ~.►4~~~LF~rt~aNSi _ - - - 4 ~~-Y~~- ~ _ _ w__ . - - - - [zlw - - - - ~ - - ~as~rn~.v.~-_.. - - - - - _a_ - ~ ~ - - - _ - _ ~ . '~Ot------ - - - -r k---- ~.5~ - , i ~.5' ~ - - -T°p o-~ Pr:•4e.w.°` _ - - - ~ - . _ _ . O.o1~~-sT•1FT. ' , t,,. L • + • • + 4 , , - ..~y.~p'~- -•Il~~. ,r~ r+~ ° ~~',r. Ga(.~.~"t..._ ,,~'4 - ` ~,13'~ 1vv t. cr~n~,~.l ~ T./FT. S wale_.5~~~~ 5=. ~estia.ln~,~. e,-- . ~ t_._4 _ _ ' - - " - - ~ • _ _ _ _ _ - - - e ~ . . . . T _ . + r!9 ' - r a-~~~r"" _-n`~,`1-' - e....,______....._.____. ~ ' - ' ' ° - ' ' ' - ' ' - - lp . - _ ___w - ~rq ~ _ ` ~ - ~ - - - ---__.e_ ..._1~.--- ~ o,s~,m~.~n~ _ _ _ - - - - ~7------ - ~ - - - - - t. _ 1 a` - - _ _ - - ~.5~-- - - ~ i.~' - - -TpF - of i~r;vewqy - ~ - ~ - - - - - ~l.►,,_~ ~ ~ ~ ~ -~.,~-~jT r~.~1*~! ^ ~ ~,~yrt ~ ~ e ~ F`Y. ~ ` a` - - + ~ a ~ - . - - - . . - , . , a • . - ' ~::~r..~t11r'rl~. No~.mq~ _ S F; ~~.T..~ ____.f,.. - - - ° - - - -tt- C aint. wa~f- 5lope 5C]~~orn-- ~ ~wrlc t~ ~ _ tiD~ _crC+SS^- S ~C~"i'I[7n0.1 ~recL. 017 S\N 0.1e- - ~ r"' '9 7.. 0v y~~''~ ~~.~;-r. ~y. ~ ~ _ . - • _ r _ _ . - - - . - - - - - , Kros-~.. •a ~~acscsx at~•~• t►;.`" a.. ~'t. ,r~:.~qya~,•,L -y^±s~'•~ s DETENTION BASIN DESIGN: RATIONAL FORMULA HYDROLOGY & BOWSTRIfVG METFiOD DRAUJAGE BASW ANALYSIS fa 10 YEAR STORM EVENT Date: 8/i 8/98 Projett Name: Midilome E.ast 2nd Addition Job No.: 12838 Projed Location: N 1r2. S. 34. T. 25 N.. R. 44 E. W.M. Designer. K MCMUWN Draertage 8as+n Name: "P Disic Dir.: A1:lbavstring Qrainage Basin DescriP6on: Ottsite Filemame: 12838ids '208' Pad(ng Aree Name: awale For: Tomiinson Ponding Area l.oeabon: south side of 38th Avenue Poirrt of C.ancermaUon: Sta. 5+06.50. RL SUBAREAS T1ME OF CONCENTRATION (Tc), minutas Oescncdon Acres C A•C Overland Flow Channel Flow Imaevwous 208'4teAS: SeamenMA: L2 ~ 416 Ilspfmit Pavement 0304 0.90 0274 Ct= 0.15 7.3 Roafs 0.000 0.90 0.000 Lt (/U = 0 8.6 Drivevrays 0.161 0.90 0.145 N(A) = 0.4 8= 0 Grass lavm 0291 0.15 0.044 S(A) = 0.01 n= 0.03 OtherA►eas: Tc (A) - 0.00 s= 0.0094 d = 0 351 Seoment B: L1(B) a 0 Te (ch.) 4.63 N(B) = 0 Tc(A+B) = 0.00 S(B) ° O TC totdl 5.00 Total Basin Area, auea ~ 0.756 TC (8) a 0.0 fn0ensity a 3.18 CompoarOe Rurtotf CoeRiciertt = 0.61 Combined (Area ' RUraft Coafflaent) = 0.462 Q(estlmated ~d)= 1.47 C1.S. Time at Concentration = 5.00 minutss '208' DRAINAGE PARAMETERS - '208' Pavemerrt Area = 13246 sq. R PEAK DISCHARf3E, 10 YEAR S7'aRM '208' Volume PrwxW = 729 eu. R at 5 depth SEorm Stcreg9 Provided = 729 tu. R et 8' depfh Q a C' 1' A= 1 A7 C.F.S. BOWSTRiNG CALCULAT10NS A aq ab ais ir- NUMBER and TYPE ot ORYWELLS PROPOSEO ' Time Time IrtOarssty Q dev. V in V out Stotape Irtcrmtrt. Incrtnttt 1 SIn9"amel (SDolEtne CauritY TYPe A) (min.) (sec.) (tn1hr) (A'(d3C~) (w R) (outf. ' ~i)2) ~(cu. R) 0 Doubb-Barrel (Spolmne Courriy Type 8) .3~0.6 :~i$ i:d'i 9) 38~6 oi' OuMavProvided: 0.3 e.fs. s 3m s-% M sm 3b or to soo 2.24 1.03 727 teo s47 15 eoo 1.77 0.82 819 sM sas 20 1200 1.45 0.67 erz 360 s12 25 1500 121 0.58 898 450 448 '208' TRFATMENT 1/OLUME 30 1800 1.04 0.48 914 540 374 35 2100 0.81 0.42 926 830 298 Required GPA. pondtrp volume: 40 2400 0.82 0.38 948 720 228 Imperviais'208' Area x 1/2' a 552 cu. R 45 2700 0.74 0.34 958 810 148 vdume provided at G depth - 729 cu. R 50 3000 0.68 0.31 975 900 75 pKi 56 3300 0.64 0.30 1008 890 16 80 3800 0.81 028 1043 1080 J7 65 3900 0.60 028 1109 1170 -61 70 4200 0.58 027 1153 1260 -107 75 4500 0.56 026 1181 7350 -158 STORM STORAGE VOLUME 80 4800 0.53 024 1200 1440 -240 85 5100 0.52 024 1250 1530 -280 Mmdmum storope reqtured = Sqg w.1t 90 5400 OSO 023 1271 1820 349 votume prwided at 8' deplh = 729 a. R 86 5700 0.49 023 1313 1710 397 pp 100 8000 0.48 022 1353 1800 -447 Sbrilpson Eng1►mwa. ina 909 Nafh A►pMMAb8l. Spok~ WA 99?!2 (6Q9) 9291322 m~. s nr:•a~st }.'t~-Miw% 11ai.ER~+~.'.• . ir'. ••SW.'t:tFta"rr . r.rc„rr.. ~..-.i,,.,.,, . . _ ,R _ j .~_,~-;:t • - . . . i~ { ` ,r • Stormwater Drainage Report II. STORMWATER DRAINAGE CALCULATIONS: (continued) Basin I Curb Ooening at Law Paint, Sta. 5+06.28, right, 30" Avenue Curb Inlet 99 h= 8 in. = 0.67 ft. Total hei,ght of opening H= 0.08 ft. Depth Qf water at entrance Q= 0.11 cfs Total peak rate of flow Q= 3.087(L)(H)3n for H/h < 1, 0.08/0.67 = 0.12 < 1 L = Q = (3.087)(H)312 = 0.11 = (3.087)(0.08)3`~ = 1.58 ft. Construct Curb Opening; 3 ft. wide, 8 in. deep ~~~"~="~'",'i' "",n1- ~a - r ~'F• n' ria . r . _ nn~., . • + + ' _ ' • _ n • • ' RATraNaL FaRMuLA KraRaLacY ~ [}RAfNAGE SASI)d ANALYSlS for 10 YFAR 5TL7RM E1fEN7 Qate: 9lt5~8 Pro}ect Name: IVlodiiome East 2nd Adddion . D"n: kwm Proaert Number• 12M8 a*kRe ni VzbwgniaiMsxiS 5rte Lomtvn H 1r2, S. 34, T. 25 N, R 44 E. W M Basin Narrte: °4" 8asfn Descnptron 36th Avenus Roistt csf Corscentration Sta S+OE 28, 18' RigM SUBARE,45 Int2nsdv-aurahon far'l0-year Stasm Event ae.sqyption Flcres C A""C rme rme incensdy Incrmrrt lncrrnnt. Pavement 0038 0.90 0034 (min.) (sQC ) (n lhr) [9+'M 5 Qa 300.00 3.18 5 300 318 10 600 2 24 15 900 9 77 20 1 2DD 1 45 25 1500 1.27 30 1$40 1 [34 _ Total 6asin Area, acres = 0038 35 2100 091 " Compasife Rwnaff CoafTsciem = 0.900 40 2400 0 82 Combiried (Area ' Ruraff Coeffident) = 0.034 45 2700 0.74 , 5€3 3000 0.66 55 3300 ❑ fr4 sa 3600 o.s1 TfME QF GOtiCENTRA"ffO'M (minelm). 65 3900 (160 . 74 4200 q.5B Tc (averFarrd Row) Tc {gutter ffaw} 75 4500 0 56 80 4800 0.53 Ct = 0.15 L2 = 58 85 5100 4].52 Z1 = 36 90 5400 0.50 L1 (A) = 18 72 = 17.167 95 5700 41.49 N(A) = 0A1 C S= 0 10] 60[)0 048 $(A) = 0.0278 n = 0.046 s = 0.OOTf 1'c (A)= 021 d = 4} 08 L1 (B) = 0 Tc (gut ) 103 N(5) = 0 Tr.(AiB) 0 21 5(8) = ❑ Tc totai 5.00 3ntwnsi#y - 3,1$ PERI( a15CHARGE, iD YEAR STORM: Tc (B) = 00 Hdding Z07 Q=C* 1' A= 0.11 C.F.S. Q(eshrrated @ d) T [f 11 c.f a. Tme of Corxerftation = 5.00 rrdreutes 1~S313 F- S, pl, - A- 37I 7oo acr-e i3s Af , Y e- rC e.Y ~4~1Ve- T u 'A l#L a'kls -to lz-t5Q a Z32-r ~ Dri \ce~ L~ l s~Du y 2-100 ~ Q_t]45° D~~V ~5 Y ~ r ~ 'L + 000 ~ i . ~ ~ ~ [3 L) ~ rt ~ . ~ , ~ 1 ~ c~ ra. ~ir ~ $ ~o v~ S~v,~a„~ z,flna + oo a 51 136 A, ~ 3Z aa~i ~ ~s }34 r-re, C)c 00- e-~ Cvhsoc~~Y-~~ Y1@~~~~cG~~ ~ v~+n~ ~fhGlyQe~ A~ aE.~J~~a~~~ ❑'VI~•~C t7t~CCO.. 5Yi pf-xCzE k 1 1.3~ S ~ 1`Z lN•~~~ ~ ~ i d..G~ a~~ ~c~rr ~l ~r-•.~~~;Ci~ NG~ PF-'Z'4 tb~0 : Ds3 _ . • - ~ r ~ r ~ IZ~7 D g 'tC W m . ~ SWAI.~ 5 7 AcS;5 5-~ af- A ~ A,\J AI l.A,13 L E ~ -r ~ • ~ ~ ~I~.~ll' I F-.`~ ~ ~ ~ ~ 3v' }+[i.~18 F;~1 w 5`; 0+41, o q') a 2., 6Z~ ~C-[.~'r ~ ( ~2~~ [I•~8 ~sL} e{a~. T 3e ~ ~ • 41 , ~ ~ ~~~~~[ys~~ ~ t,~~3 ~5 ~T•~ i ;5 C ~(~.~4~ F~r•~`~ - ~!i ~~r,~ =~r}- ~~'r E i s 2 13~ F~` ` 34o s s ~ ~ y { , r- Ir' ~ b • SAS~ AaDVrrON cPt 1- cu L- V~~oNS Rlw . . - - - - - - _ ° - - ~ • _ • _ - _ ~ • I . ~sk - - - _ _ - - , - - . . s.._._~-------- - ~~r;•~ewc~~--- - - - - - - - ~B - - - - - - ~r- ~~'~ti~►r►1~I - oo~ - [3.O1~`1--rT•~FT• ~ ~ `-n . i . . ~ A--.- a_-!-~--}4~~- -'-'~`1~i~+~1 ~I -4 ' ►`~i+~ "_.~l~s~~~ , `~a-~ - ~ ' ' • I~ Nor F T . 'I~.13~ c~'~ `~^',~y ~ C v r c . C+arb . - • Swale, ~v~~vwn ~ - ~ - r ' ~ - -t o`- - - - -C-r v c-t i o,~ .c,T_~,yv - ~ _c 8.5 _ - - - - ---I-~---- - - - - 7L~~O.S~,13.~4} O.c11 00,1 , - - - - - ' ~ ~ • ~ / --•~/F~.Y--•_ _ - ' ° jw . - _ . -i - _ - - - - - - -.l~ 6~G at 5~.~cv►~.sn"F ' - - - - - - _ ~ - - - ~ - - ~ ` ' - - ° • f ~ - - . . - • ~ ~ A T 0.0 t6~ YI! i +'r411J~1„ri. - • ' l~l ~11 ; ~ 5 -,p . :,r~ii71..I:li . ~ ' a ~ • c ' ~v • ~ ~ . i a ' = h1 : 1 ' ~ ' ~ * 1 fi I ~ 1~• ~ C7. e16, IFT ~ ~.~7;~~~~l~-71 ~ ~'Y ~ - . r - .p?-~~ - ~°r~~!-5w /5~~. - p~ _ _-.__Sr+ta~~'€: €3t"Corn~_- _ - - - - - - - to~._.~ I _ ! ~ _ •Cr455 - Se.CTtiOrna\ ikre-0. D"C sW A~'.. - ~ _ - i ~ ~ • - 4r ' ~ ~ ~ - - - - 0.(~ ❑.ib ''.ov 3.55 Fi. , _ ~ - - - _ . _ . _ . . - - - - - - - - - - • DETENTION BAS(N DESIGN: RATIONAL FORMULA HYDROLOGY & BOWSTRING METHOD DRAINAGE BASIN ANALYSIS for 10 YEAR STORM EVENT Date: 8/18/98 Proled Name: Midilome East 2nd AddiUon Job No.: 12838 Project Locahon: N 112, S. 34, T. 25 N. R. 44 E. W.M. Designer• K. MCMUWN Dramage Basin Name: "J" Disk Dit.: A1:tbowstring Drainage Basin Descnpbon: Onsite Flename. 12838x1s '208' Ponding Area Name: swale For. Tomlinson Ponding Area Locahon: east side of Verder Rd. Point of Concentration: Sta 26+00. Rt SUBAREAS TIME OF CONCENTRATION (Tc), minutes Description Acres C A'C Overtand Flow Channel Flow Imnervious '208' Aress: Segment A: L2 = 258 Asphatt Pavement 0.187 0 90 0.168 Ct = 0.15 Z1 = 7.3 Roofs 0114 0.90 0.103 L1(A) = 0 Z2 = 8.6 Drrveways 0.046 0.90 0.041 N(A) = 0.4 6= 0 Grass Lawn 0.387 0.15 0.058 S(A) = 0.01 n= 0.03 Tc (A) = 0 00 s= 00078 Q,yerpieas- d = 0335 Seqmertt 8: Lt (B) = 0 Tc (ch ) 3 25 N(B) = 0 Tc(A+g) = 0 00 S(B) = 0 Tc total 5 00 Tc (B) = 0.0 IMensdy = 318 Total Basin Area, acres = 0.734 Composrte Runoft CoeffiaeM = 0.50 Combined (Area ` Runoff Coeffiaent) = 0.370 0 (es6mated @ d) = 1.18 c.f s. T'ime of Concentration = 5.00 minutes '208' DRAINAGE PARAMETERS ' '208' Pavemerrt Area = 8136 sq. R. PEAK DISCHARGE. 10 YEAR STORM '208' Volume Provided = 454 cu. ft. at 6' depth SWrtn Stotage Provtded = 454 cu. ft. at 8' depth Q= C• 1• A= 1.18 C.F.S. BOWSTRING CALCULATIONS 95 A IFZ) dn ~T NUMBER and TYPE af DRYWELLS PROPOSED - Time Time Intensiiy Q dev. V in V out Storege Incrtnrrt. Incrmrrt. 1 Single-Barrei (Spokane County TYpe A) (min ) (sec ) (nlhr) (cfs) (cu. R) (cu. ft.) (cu. ft.) 0 Double-Barrel (Spokane Courtty Type B) a ~ ~1 •,s'O~dG s ~ & ( A ' C ~ ~ F s a T s (o~.~ ( : s B T OutAow Prohded: 03 c f s a ;sm ;l:its i-b aTs 90 s83 10 600 2.24 0.83 582 180 402 15 900 1.77 0.66 656 270 386 20 1200 1.45 0 54 699 360 339 25 1500 121 045 717 450 267 '208'TREATMENT VOLUME 30 1800 104 0 38 732 540 192 35 2100 091 0 34 742 630 112 Reqwred G.PA. ponding volume: 40 2400 0.82 0 30 759 720 39 Impernaus '208' Area x 1 R' = 339 eu. ft. 45 2700 0.74 027 767 810 -43 volume provided at 6' depth = 454 cu. R. 50 3000 0 68 0 25 781 900 -119 OKI 55 3300 0 64 0.24 806 990 -184 60 3600 0.61 0.23 836 7080 -244 65 3900 0.60 0Z2 889 1170 •281 70 4200 0.58 0.21 923 1260 -337 75 4500 0 56 0.21 954 1350 396 STORM STORAGE VOLUME 80 4800 0.53 0.20 962 1440 478 85 5100 0 52 0.19 1001 1530 -529 Maximum storage requved ~ 402 cu. ft. 90 5400 0.50 0.19 1018 1620 -602 wlume Prwded at 8' depth = 454 cu. R 95 5700 0 49 018 1052 1710 -M OK! 100 6000 0 48 018 1084 1800 -716 Slmpson Engrneers, lnc. 909 North Angonne Road, Spokane, WA 99212 (509) 926-1322 1-1 ~ . ~ Stvrmwater Drainage Repvrt U. ST(]RMWATER DRALNAGE CALCULATI(]NS: (continued) Basin J Curb Onenine at Low Poiztt, Sta 26+40, right, Vercler Drive Curb Tnlet 410 h= 8 in. = 0.67 ft Totai height af opening H= 0 117 ft. Depth Qf water at entrance (1= a 34 cfs Tota1 pealc rate af #lnw Q= 3 087(L)(H)312 far HIh c 1, 0.11710.67 =0 l S< 1 L= Q-(3.o~~)(H)" =0 34 -(3 087){0.1 I7}312 = 2.75 ft Construct Curb C7pening; 3 ft. wide, 8 in deep _ C~ R- RAr:atiAL FORnauw HYDRaLocY C7f2AINAGE BASIN ANi4LY515 fvr 14 YEAR 5Ti ORM E1lENT „ Date' 9115198 Project Name' Miditome East 2nd Addrhvn Design kwm Project Number: 1 Z83$ oiskFiiB nti Vauor,ania1zma.xfs Sde Lomtton h' 112, S 34, T 25 PF , R. 44 E. W M Basin Name. J. Basm Descnption. Vercfer Dnve Peun# of Canoentrahan, Sta 26+06, 18' Right SUBAREAS, fntensity-Duratian far 10-year 5tarrn Event Descnptron Ptcses C A"G Time Time fntensity incrmnt Incrrnnt Pavement 0118 090 0106 (mm ) {sec } {in Ihr} w"M 5.i}0 30100 318 5 300 318 10 60(3 2 24 15 9[10 1,77 20 1200 1 45 25 1'504} 121 30 1801) 9 .04 Total Basin Area, acres ~ Q 118 35 2100 0.91 Compvsde Runoff Caefficerit - 0900 40 2400 0.82 Comtmned (Area ' Runa#G Coeffioierst) = 0106 45 2700 0.74 50 3DD(l 068 55 330(1 4] 54 sa 3600 061 TIME OF CONCEidTRATION (minutes) 65 39fl(} ❑ 60 70 4200 058 Tc (oveflsndfiaw) Tc {gutterflow} 75 450(} ❑'56 &1 4$a0 053 Ct= 0.15 i2= 107 85 5100 052 Z7 = 36 90 5400 050 L1(A) = 18 I2= 0.163 95 5700 0419 N(A) = oais g= o 100 6000 aaa 5(A) = 00278 n= 0.015 s = 001 7c (A)_ 021 d = ❑ 117 L1(B) = a Tc (gut ) 130 N(B) = a Tc{A+9} 0 21 Sp = 0 Tc totai 5 oo Irrtensity = 318 PEAK a15CHARC;E, 10 1fEAR STDRM: Tc (B) = 00 Hvkfing 381 @ =C* I' A = 0.34 C.F.S. Q(eshmated @d} = 034 c.f s Time oT Corrcentration = 5.00 minutes _ J 3~, !'r _ 11i*•: - v°~aas ~ P A~- '~T~~ 'r~'?''°'S.Sf ~#.~'~.-•a'^ .•.4~'~" , " ' ~ 'fa 3a• • ~lak~~~'r ~ • -Sn s ~~~`y r r'~ : ~f F w~^.~. . n?. ~se~z',Ct~~. • ' P • ~ ~ ' Mtv~+~a~r _ _ ~,A A~v►-r~v~ ; ~ - y-w m $ASIiN µ Ku ~ibTAL ~ ~ ~C+? P~ v.l1Z$ ~c'ce Dr~ves 1,~ov ~t'` ~ 3,vvt~ ~~r~" ac~~ es 3 ' . ik F- ,a a f 0 ~ lmpEt~vrvu s ~ ~ 6V-NSS ~ 15,185 - S,k96 ~ IDr S S°I D.243 I dl( ~Gi~'~s►~e o.r-e-o, C.Dhs~~e-re.~ regl;~~lo~~ akl Ev\clu.le.4 oL t de4 e.ID,? tA 0 V~ ~e. vor P~ cx . S T bF- A~'E ~EaU►RSD : . ~ ~rt. ~ ~v4 ~-~3 1K. b] ~o~v~l~-~~r~~g ~ ~~5~ ~~3 } 1 S~h91e. g~rre.t Drywe.{i C hA3 A 1 P C • "i ~ ~1 ~ _ ~ • - _ ~ . ~ +r• 9 1Co5 ~ _ ~a Y`%•j aTfR' eae~~.s~s•,:.r:.e. ' _ ,-tl##Zz- y ,'h `~a.°` r n , aw . ~ ~ Y ° . . M►j'L7 L'L.rO`[`r1S S141) D S71 Yt aN 11283 g ~ lz(. 1.78 t~ ~~A1NPeC~s~ ~.AL_~.UI~ATi4D1ti1~ - lrlWm SwALS '?IiVSMSPLT Pl.?-eA 5IeF-H69 S,Ta?- AG F- P+VPt1LA6L E , r~- ~z [t~'~'~~~~ ~ l~r ~~`t~~l•°l8 '~rt~~ Iz~ ~~_3 ~:,~^^~'a. :~a@ _ j ~''~~ys~t~i.ry~~~„r~ "a.c.~.c~,~,~'~ _ 'S ~ ~.,'^r.,:•~dk~ , ~'~l~f~?~e'~'~~ ` . , ~'~w , . Ml D _I_1_ a_ms S1~ s-r 2 l'D #,D i)t T 1 oN '1 2 ~ 3 'R - aR~•It~A~~ ~.AL~~1~.A~4~~~ _ _ . _ - - - - - - - - F-1w - - - ~ - - - - - ti ~ _ . - - ~3 ~c~.saYn~rn`F__._._...- - - - _ . - - - - - ~T+►~n,._y, ~ ao p.olle'1--FY•IFT• ~ la . s ~ . , n „ . . , ~ ~ . ~ i ~ . . , _ . , „ , . _ i. r r. . ' . • . ~ T. I ~Y,- ls ~.l G or c. Wad e.S~~p~ , _ - - - ~ S w qi e. $ a ~ w► - - - - - - A~-' ~ ~ ~ ~ -..s ~ ~ I ~z~~4•~~l`~'.Z`~~ ~ ~ z~~0,5~~3.~4~ ~ 1.~$ F~C. - - ~ _ " ~ ~ • g <<6 ~ ~ =~g ~ - - _ _ • - - - - - • - - - ~ - - ~ ~ _ _ _ • • - - • . -C , ~-fF ~ ~ti..ti , - - - - - _ _ " 4~~W . - - - _ i a - - - - - l~G t~S~Y+re.e.sn~ . _ _ - . _ _ - - w ~ . - - - • - ~ 1 v~ - _ • _ _ • - r " ~.5~-- - - s 1.5~ • - - - - - - Tl vg af ~~iv~wav~- - - - - _ ~ - -i- - - :~r~ iG7 • _ s ' ~ " ~ . 1 ' i . L " ~ - a _ ~ ~ y • . a . ; 4 • : ~ ~ , ~ 4 - - I ~ . tfl~tlitG'c1;~„irla,r, , ~~r; . . i D tK- ' 4 FT. ~ '/r-T•-- - - - - -,~<<r.~ ~ - ~a~nc. S le_ 5ia w► • C.ur1a Pe Swate. 7D0 . - 1a4.__..__~~-- ~.5~ ~~I ~ - C-ra55 s~cA►Dria'I Arew o~ SW al~. ~ r I ~ ^ - • - _ 4.-t.9 `pO~ _L ~ L a.5) (~,Za) 0. 1.9 3} ~ p. 5`~ p" - k. 0,1 d.-'Tb . c ~ Fr~Fr • ~ _-_3:5 5 q= - - _ _ . _ . ._'.Kx....~ ~-.-i_'r.aL`9:ac~".~--r.as...{.,~ • ' f , +iQS[F ~ DETEMTION BAStN QE51GN; RA7'1QNAl. FC]RNiULA HYf3RO4OGY & 80WSTR[NG METHOD pRAINAGE SASIN AHALYSfS For 10 YEAR 5TC7RfN EVENT Qate' 8118t98 Proisd IYame Mjdilams East 2nd Addrtivn Job No ' 1283$ Prajett Locahon N1R. S. 34, T. 25 N, R 44 E. W M pasigrrer: K. MCM[Jt.KIN D+sirmge 8astn P}ame: °Ft" Disk Oir.: A1 •lEowshGng prauvags Basan Descnphon: Onss6a iFi}errame: 12838x1s 'ZW PondangArea Name swale For 7nrnl'srisan Panding Area Lacaton west sida nf Vercler Rd Rvurt ot Concen0atian' Sta. 26+00, E..L SLIBRRFJIS 7i14tE C?F COIVCEIVTRAFIOM (Tc), mmutes ❑escnption Aeres C A'C t]verland Ffaw CtFannel Ptsw Irnneryxus '208' Areas°, -Swrr►errt A. L2 = 160 Ilspiralt Paaement 0.112 0.90 0101 CJ= D.iS Zi = 7.3 Roofs 0 DOQ 090 0000 L1 (A) = 0 22 = $ B arrvewaYs 0.069 0.50 a 062 A!(A) = 0.4 B= a Grass L.awm 0243 015 0036 S[A] = 6 01 n= O.O:i Tc (A)= 000 s = 0.01 poerRreas: d = Q 253 Seg+»ant B- L1 (B) = 0 Tt {ch } 2.15 N(B) = 0 7c(A+B) = 940 5(By = 0 TG total 500 Tc(B)= 00 inYensrty» 118 Totaf Basin Area, acres = 0 424 CampvsiDe F2unotF Coeffiuent ~ 0.47 Con6irred [Area " Runaff Cooftiertt] = 0200 Q(asLmated (g d) = 0.&3 c.f s Time of CarteerMcu3 = 5.00 mmvtes '208" ORRfN11G£ PARAMETERS '208' PavamentArea 4896 sG. It PFAft B1SCHAR[3E. i0 YEAR STOFtM '208' Volume Pranded = 242 cu• R. at 6° dept Starm Stcrege Prvindad = 242 cu R, a! 8" depth Q =C' I• Am 0.63 C.F.S. BOWS7RSAiG CALCLlLA7iOtJ5 . ~ ~ ~ ~ & 9% acT NUMeER and TYPE of QRYINECiS PFtdPdSED 7ime rnqa Irv6ewAy 4 dav V in V aut Stnmga Iricrmrit Incrmrrt 1 Sin9la-Barrel (Spakana Caurny Type A] (mia.) [sm.] (nJhr) (ds) (cu ft.) {cv. fQ (r,u. R.) 0 []ouWeZarre! (Spnkane CaurifY TYpe B) {ouff.' SBi 5 (#llfq W3~$ C t7s i #L) i autlira+r Prrmded: Q 3 o.f.s+ v sIf[i 37% u-m A) 3G iw 10 600 2.24 0.45 314 180 134 15 900 1.77 025 954 270 84 20 1200 1.45 029 377 360 17 25 150Q 121 024 387 456 -63 `^c08' TREA7AREW VOLUME 30 1800 104 0.21 385 540 -945 35 ztoa 0.91 als aaa m •asa ~~wied G PA. pondins volume. 40 2400 082 016 410 720 -370 9mpennous "20g' Area x'1P2' = 2064 cu ft 45 2700 0 74 015 414 81 Q -396 wlume provdad at F" deptls = 242 cu+ ft so 3000 6.68 0.14 421 9U0 -479 QK' 55 3300 CI.64 613 435 990 -555 60 36oa a.sa 0.12 451 1080 -M 55 3900 060 012 479 1170 -691 70 4200 0.58 f].12 498 1280 -782 75 45D0 056 Q"! 1 514 1350 -8Jfi SFQE2NrS STORAGE VgLL1ME BO 48Q4} 0.53 0.1 f 519 1440 -921 85 51 0D 0.52 0.10 540 1530 J9(] Moumurn smra9e requtrad ~ 165 au fL 90 5400 0.50 0.10 5+49 1624 -1071 wfuma ¢towdad at 8" dep1h ~ 242 dr f! 95 5700 0.49 0.10 5&8 1718 •1142 OC! 100 6000 0.48 610 585 1800 -1215 SlmPan &NIbmwal erm 90 Nort'+Argonne Rord spokena, 6YA 99212 13as1 926-1322 . - . . 4 y . _ rr ; , _ - . • . . _ + Y . ^ ' _ r _ v_ - . . . - . _ , 5tormwater Drainage Report . U. STORMWATER DRAINACsE CALCULATIDNS: (cantinued) Basin K Curb Uaening at Low Point, Sta. 26+04, Peft, Vercler Drive Curb Inlet #1 I h=$ in. = 0.57 ft. Tota1 height of opening - H~0 465 ft. Depth of water at cntrance Q = 0.07 cfs Tatal peak rate offlow Q=3087(I.)(H)3`2 far HJh <I, 0.065f0.67= 0.10<1 L = Q (3.087)(H)312 = 0 07 (3.087)(4.065)-"2 = 1.37 ft. Gonstruct Curb C3pening; 3 ft. wide, 8 in. deep -1. l:.-. j-1 > . ~ i . • r - . _ . . , ! - . . . RAT1OfYAL FORMULA Hl'DROLOGY DRAINAGE BASIN AAIALYSIS far 10 YEAR STORM E11ENT ❑ate' 9115W Project Narrte: Midilame East 2rsd Addibarr ~ pesign {wm Rrajed lVumher. 32M8 ~Rkl~ ni VzWmanzMizMa.)ds 5de Locataon: N 1tZ S 34, T. 25 N,R 44 E.W.M. Basin Name: "K" Bawn E?escriptian: Uercler Drnve Pant vf Coneerttrafiaan: 5ta. 26+00,18' LeR S41BAREAS. IrTtensEty-D urabon for 10-year 5torm Ertent Descnphnn Acres C A'G Trtse Time frrtensrty Irtcrmrtt. incrrnnt. Pavement 4.025 0.90 0023 (rnin.) (sec•) (in !hr) f#I'= 5.00 300 00 318 5 300 318 10 600 2.?4 15 900 177 20 12DQ 1.45 25 1500 1 21 30 1800 1 .D4 Tata! Basan Area, acres = 0025 ' 35 2100 [].91 Camposrte Rurroff Coefficien# = 0.900 40 2400 0.82 COrnbired (Area " Runoff Coefficient) = 0.023 45 2700 0.74 50 30C]L1 0 58 55 330D 0.54 so 36Da asa TIME OF CQNCENTRA"f14N lmjr€utesl: 65 3900 0.60 70 420U 0.58 T'c {ovedand Row} Tc (grtfer fJow) 75 4500 0.56 80 48M O.s3 Ct = 0,15 L2 = 41 85 5100 052 Zi ~ 36 90 5400 0.50 Li (A) = 18 I2 = 0167 95 5700 049 N(A) = 41s B_ ❑ 100 saoa 048 S(A) = 00278 n = 0016 s ~ (7.01 7c tAj = 0.27 d = (1.065 L1(B) = 0 Tc (gut.) U.73 N(B) = 4 Tc(R+B) • 0.21 SA _ 0 TC totai 5.00 IntermrtY' 118 PEFIK'd]i.RCNRRGE. 10 YEAtSTORM: Tc (B)= OA Hddui9 1 46 0-C`I*A= 0.07 C.F.S. 0 (estirnafed 0 d) = a 07 c f.s. Time mt' Gw~on = 500 mFnutes K ~ ~r~'f(_ . , F~R'wt , . ..r'.` ' , , . 3'•?~+x4~:~e.~ ~ ` ~ ' ' [LOMS A, ST Z"' k1> Q1TlDN ; ~~AlA1,AGE CAL~~3LR~ilo4~l~ S~ZG~`~~ Y,W r'1 ~ f~ ~ I f~ L N 2.~+1 35v G,vr-$6 ~..0,,,..~ IN ~.,S l . 43 '13 3 ~ o p' ~,ao~s ~ ~ Kaas~s @ ~.~ov r~ I(O=~ao 0.3 (.13 aer~~ Haase. ' ~ " L v~w r, Nv~~•. ~"Cl~e.. ~iv~} -~e,ve.la~w~ev~~ t`a~e. o'~ ~uwo~~ ~'lowGV~~ ~~r~ ~t~~, ~►~i~ a.w~ ~Ca ~tfsr.e.. WeaT ~~~v~ ~~G ~t'~r~-~7ev~.~v~v+~e.v►~ 1~q~e a~ }~,~~ev~~. ~~~r~,osA~~ ►f\ r7 A)rA►Ylv~3eL ~ac~kiiti SS rare-. ?lqV►V►e.~ for . G.~, • a p~--~.4'd ~r^ °s _ _ ~i` .i~''i _7.P- a^A~" -^~s ~34 `•~i~; -r~._ Q7~ . ~ " i 1~ ~ ' • ~ ~ _ _ f . .4 +aD , r •+4 ~ 150' ~ 4. 47' L924 ~ 1/12 7 L~33' luilding SetbrtCkJ/ 1 Q I7 1 cn 2 g ~ f 255' • ~ , ~ i 11 L7' 1 L ~ y j 3 I ~ CO I T ~ 1 6 T ~ 14 sr'r~ F 90. I L~,~P L~1o2" ~ ~ A., ZC) SOo ~ ~ ~ ~ / ✓f/.I tt~ ~ ~r~ 'i ~CJr ~ . 0 so• ~ L~sa ~s 9 ------~-8uildi Setbac o 1~8' l ° ~ J~ ❑ G,~ r ' ~ a i R" ~ : g = a' a' ~ sID, " 01 ~ ~ i 118' io r e ~ ~ ~ ^ ~ ----r,... °----_v... -.e__--.--._ 1 ~ eI,cE Pa~};J{ 79 ' . so' ~ so• sca' 98' ~QV - A ~ N tn f 7 3' sv' 1f°g 8a' sa' Building SedGack T- j ~ ;rs 25' 25• ~ ~ / / J~ ~ 4 47 93' I ao' So' f~ 80' I So' i 50' ; ; . • `~1 ~ ~'w + ~ I ~~s 5.~'~ ~ "w ~ ~ ! I ' r I I V ~f f ? - s • ,y •ts : Y~ . . . ~ Ar' .y47.s5,'.u4.'R-a.:3~~'.'a~x.~sdm;".'=~«..n-~:•~r.,..~,T^,4~Lr:..:ay...... C~" ~n~: w " .~~~'.ji~,~;s~~-~' G xi ~,.~.T7,~ - i ' RAnONAI. FORMULR WDRC]LOGY [}FiWNA['sE BASIN ANALYSIS far 50 YFAtZ STORM E'1lE1+1T Date' 8117l98 Projed Name' Midilme East 2nd Rcldrdvn , pp~n kwn Prolect Number: 52838 o,skFiis. ni v=mwnyrni asse ids Srte Loration' N 1r2, S 34, T 25 y,R 44 'E W M i 8mrs Name: °L" Sassn Qescnpfiaaz: Pos# Developmerit Point crf Concerrtration° None gUgqREqS. Intensrty-❑urahon for 14-year Storm Everst pescnpftcsn Acres C A'C rm$ rme iMensity incmint Incrmnt ~ Grass L,awn 1 506 015 0 226 (min ) (sec ) [in.lPsr) Hvuse Roofs t} 367 0.90 0 331 i011sm 5 94 35645 432 5 3(DO 4'58 10 600 3 20 45 900 247 20 1200 198 25 15fI4 1 67 30 i BM 1 46 Yotak Bas,n Area, acres = 1 .873 35 2100 130 Compasae Runaff Cae#fiaen#= (]297 40 2400 9.18 Com'6ned (Area ' Rurtaff Coefficient) = 0.556 45 2700 107 ' 50 3000 100 55 3300 4.92 60 36W 0 87 TiME OF COfVCENTRATiaN (minute.s): 65 3900 0.82 70 420[3 080 Tc (avedand Row) Tc (gutter flaw) 75 450(} 0 77 8(} 4800 075 Ct = 415 L2 = 0 85 5100 0.72 Z1 = [f 90 5404 0.7(] L9 (A) = 120 Z3 = ❑ 95 5700 069 N(A) _ ❑.5 8= ❑ S04 6000 0.67 S(A) = O.017 n = a s = a Tc (A) = 5 94 d= 0 C,1(8) = 4 Tc (gut ~ 0.00 N(B) = 0 Tc(A+B) - 5,94 S(B) = 0 Tc to#al 544 fC►tensilY ` 432 PEAK DISCHIARGE. 10 YEAR STORM: ;c (S) ~ 047 Haklmg 0.0(] Lt -C* i"A = 2AO C.F.S. - Q(esti'mated @d) = 0= c i s. ~ Tir1m of ConcentabDn = 5 94 mirwfes .~v~u~ °=~;w-, : . •'~c~=~ry-.,,,,vc,? , - _ •:r . T. :r ~ ~sw~r _cas _ _ 7 r 117, yJ d • RATIONAE. FORMLILA HYDRULOGY DRAINAGE BRSIN AIVALYSIS for 54 YEA1R S'T[7RM EVENT Date, 8117198 Praject Name: dlArdifome East 2rsd Addftn DesYsgn' k`nrn Praryed Number t 2838 Dmk Fkr pi vanonanIrn12a3a.As Sife Locahvn N 1►2, S 34, T. 25 N., R. 44 E. W 1N Basin Name: "L° 8astn Descnptison Pre-Development Pvirrt of CQncenirahon: Idone , SflBpREAS: Irrtersty-Duratiars fw 40-year Sfdrrn Event ' ❑eswptton Acses C A"C Tine Tme Inter+sity Incrmnt, lnermnt Grass Field 6069 ❑ 25 1.517 {min.} (sec ) [inJhr) 9 80 58829 325 5 300 4 58 10 6DO 3.2(] 15 90Q 2.47 20 1200 1 98 25 15m 1.67 30 1$Q[] 1.46 Toiai Basm Area, acres = 6069 35 2100 1.30 Composde Runo## Ccaeffiaent = 0.250 40 2400 t.18 , Combuied (Aree' RunofF Coeff[cient) = 9 517 45 Z700 107 , 54 3000 1.00 55 3300 0 92 60 3600 067 TIME OF CONCEiVTRAT[t7N (rnsnvtes): 65 3900 082 70 4240 0.80 Tc [overtarad iJaw] Tc (gc►ffar 1Jaw) 75 4500 417 $8 48[x] 0 75 Ct ~ 0.15 L.2 = 0 85 5100 072 ' ZI ~ 0 90 5400 070 - L1 (A) = 500 I2 = 0 95 5700 4.69 N(A) = 0.3 8 = [l 100 6ow O.fi'f S(A) = 0.02 n =0 S= 0 Tc (A) = 980 d ~ ❑ L9 (6) = 0 Tc (gut•) 0•00 N(S} = Q Tc(A+8) 9.8[] S{8) = 0 Tc toal 9.80 Intenssky = 3.25 PEAfC aISCFIARGE, 10 1'EikR STORM: Ta (B)= 0.0 Holding 0.04 L1 =G* f• R= 4.94 C.F.S. 0 (eskmated @ d) _ (].00 c f.s. 'Tme of Cormenhman = 9ZO minu6es ucm - _ . . ' ,s , • ' . - . RATEaNAL Ft7RMULA H'YDR4LOGY ' f]FLAi1VAGE BA51N ANALYStS far 10 YEAR STC3RM E1fENT Date 8F1T1W Prcajeci Name; Middome Eas4 2rtd Addrtson Dew9n k-wm Prvfed Number 12838 Disc FW A9 7aLOn8R1[R1 283$ id8 Site L.ocattvn IV 112, S. 34, T 25 N., R 44 E. W!Vi ' I Basin Name: °L" Basin C7escnption: Pust Qevelopmeni , Posnt of Cancerstration. NarYs SU6Af2EA5 Ir[tenssty-€]uranan for 10-yea r Stcum Event []escnphvn Acm C a'C Time Time [ntensKy incrrnnt_ Incrmnt Gsass Lawtti 1 506 015 0226 {min.) (sec) ~in Ihr} House Roofs 0367 0 90 0.331 t4+*Wi - 594 356.45 3 00 - 5 300 3.18 10 soo z.aa ' 15 900 177 20 t2d10 i 45 25 15i}0 1 21 3[] 1800 1.{]4 Tatai B"n Area, xres = 1 873 35 2100 091 Gamposte Runaff Coeffiderrt = 0.297 40 2400 0.82 Ccrnbirted (Area " Runsff CaeRiaer►t) = 0556 45 Z700 074 50 3000 068 55 3300 ca sa 60 3614 O.61 TIME f7F CO!l+ICENTRATEON [mmutes] 65 0 60 70 4?!]0 ❑ 58 Tc (avedarrd flow) Tc (gutter fiativ) 75 ~ 056 80 480D a Fa3 Ct = [].15 L2 = 0 85 5100 4.52 Zl = 0 90 5400 a50 Li (A) = 12(] Z2 = 0 95 5= 049 N(q) = Q.5 B= ❑ 100 6000 48 S(A) _ (].017 n = a g = 0 Tc(A)= 5.94 d = Q L1 (8) = 0 Tc (gut.) 000 N(B) _ 0 Tc(A+6) • 5.94 - S(B) = D Tc totai 5.94 Irstensity' 3.00 PEAIC D13CHARGE, 10 YEARSTORM: Ta {8} = 0.0 Holding 0 90 q-C*I•p= 1.67 C.F.S. Q(estimated @ d) = 000 c.f.s. 1 in-A aF Caromtatton = 5 94 minutag uPo.si . - . " ..._r_-~_ , . . . . . . RATIONAL FORMULA HYDROLOGY DRAINAGE BASIN ANALYSIS for 10 YEAR STORM EVENT Date: ert 7/98 Project Name: Middome East 2nd Addi6on Design: kwm Project Number: 12838 Disk Fle. A1'V2Cmna1110112838ads Sde Location: N 12, S. 34, T. 25 N., R. 44 E. W M Basin Name: "L" Basin Description: Pre-Development Poutt of Concentration: None SUBAREAS. Intensity-Duration for 10-year Storm Event De.scnption Acres C A'C Time Time Intensity Inumnt. Incrrnnt. Grass Field 6.069 0 25 1.517 (min ) (sec ) (in./hr) (rn'W 9 80 58829 2.28 5 300 3.18 10 600 2.24 15 900 1.77 20 1200 1.45 ' 25 1500 1.21 30 1800 1.04 Tata1 Basin Area, acres = 6.069 35 2100 0.91 Composde Runoff Coefficient = 0.250 40 2400 0.82 Cambined (Area • Runoff Coefficient) = 1.517 45 2700 0.74 50 3000 0.68 55 3300 0.64 60 3600 0.61 TIME OF CONCENTRATION (minutes) 65 3900 0.60 70 4200 0.58 Tc (ovetiand Row) Tc (gutter flow) 75 4500 0.56 80 4800 0.53 Ct = 0.15 L2 = 0 SS 5100 0.52 Z1 = 0 90 5400 0.50 L1(A) = 500 Z2 = 0 95 5700 0.49 N(A) = 0.3 B= 0 100 6000 0.48 S(A) = 0.02 n = 0 s = 0 Tc (A) = 9.80 d = 0 L1(B) = 0 Tc (gut.) 0.00 N(B) = 0 Tc(A+B) : 9 80 S(B) = 0 Tc total 9.80 Irttensity : 2.28 PEAK DISCHARGE, 10 YEAR STORM: Tc (B) = 00 Holding 0.00 Q=C'1•A= 3.45 C.F.S. 0 (esUmated @ d) = 0.00 c.f.s. Time of Concerwation = 9 80 minutes u~~ ,,t;,~4 t,~"~';° . -,.~:e~i:L,~";M,c'ff:..~+• ::M»~C~r~'~:'~'..r, , , ' ~•~.~~~~N11VlLoME SAST 2NU /~~D1'CION ' IZ838 C DKAINAGE CAI.CULA'C1oN5 S~z~~98 KwM BASIN "Ma 1~ PRE- DE~EL.~~MEN'C z AToTAL Z 60~530 ~k, ti 1,3$q6 acre 1.."C WQS C.u►~}i V a~td . Z.~ QoST - DrcVELOYMENT A -coz A~. Z 5 I~ O¢o ~t.i 1. ►1 ac~e z vt~,v6s ` ~ f{. OOD Z l _ A FtooFs = 3~i Houses ~ z 7~00o ft• 0,160~ acr~ House. f1 L ~ ~'Itooo ~ -iiOoo ~}z ti 0,1601 acre. \Me E RV 10 U A GRASS z 5 1,0¢0 - o-a0 2 44,04~ -ft.Z ~ 1, o Ilo acre u ~ L 0.* h NoTE= T{ne. ?os t- DeveloPvv%"fi ra}e of ruhoff f(owivt9 o£f t~e site o.~.~ ~o ~~ne soy}~ ohio o~a3acent yroPeri~es ~s less }"V% Pr~- DevelopMelAi raJe of ruhoff. Thereforej ~nu dro►~v~a►9~ ~ac~ l'►}ties are. ~~q~,n~.a for Bo~silh ~I i ''1'°'~,1 2 ~'1 m , / 150' ` 2547 ~ 110' 171 1 2 - ~ ~5 ~D, fl r fr ~ ` to ~ q 'Ir tn 1A -s.~7 1`t" o ~ ~ 1I7 ` 14 ~ 150° u1 J w I ~ `T ` 1 ~ ~ _ _ 1 5 -~31 y . ~ ~ ~E i 90' L=5' , L~ 1 D ~ ~ 1 ~ ]f r m . ~ a~ ~ ~ 122 i [ ~ .y • ~ • ' ~1 ~ ~ ~I 'to i ~ 15{]' r ~ , ~ ~ ti ~ v ~ - i r 7g' 841' ~ 8 w p ~ ~1 ---~Y°- C~_°-^--- / ~ ~ l ~ ~ ~ s Bulkdf Setbac , ~ 1, e ~ ti ti, , a ~ LOc~,f ~ 4 T ! 1 ~ ~ t ' ~ ~ p 7 myoto[] ~ ~ f 9ae 0. r BD' 80` s ~ I 1 1 1 ` A. ~ 17 i' tn ~ ~ ~18' ti19' ~118' 122 I I d ~f / 1- ~ 7 y I 6 6 f, ~ 1501 F jb 30' 30' cn 1 d7 l ir1 8 [~Y o I ~v 1 c3 7 v~ w 10 ~ 9 2-5- ; s , ~~a 18 • - ~ S 7Q~ ~ _=....j ~ LQ'0 79i 80' ~ 80, _ 80! g~ ~Q f 1 10 97' 98' Ln ; r N ol ' --•~!~1C ~ 19 ` , $ $0, 5o-~ g fi9 73' 8Q us ~ ' ~5 a~ ~ i N O ~ ~ 20 M Qi A- 93- ~ W $Q. 44" AI ~ n ~ a ~ ^ s - IFr e. - TP e-V e\ Opm pmi t -v elo ynnem'k UNPL~A T TED . ~ ~ s ~ '..;:y. ,.4.ca• ` . .r;±n'+:k %F-~,~ ,c ~"'*~r ,y ~+~s~.~ ; ~ , .c;.. a.e ~`LS'" ~rY: . • • . ","~'a•. :~i , LL = r.:~b . r . • c= - . , ' nW' RanvruaL F4RMutA HraRaLOGY , DRAINACE B4S1N APlALYSiS for 50 YEAR STC3RM E►JENT ❑ate: 8n 7l98 Projed Name Niidilome East Znd Addiben Resign- kwm Projed Num6er 22938 cxmk Fle Al vabmaA10+12M)a& Sde Locainan- N 112, S 34, T. 25 N., R 44 E. W M. Basm Nams- M. Basin Descfiphvn: Pas# pevelopment Posrt o# Concerrtration. Narse ° SUBRREAS. intensrty-L7uratiars for 10-Year Storm Event C]escnptivn AEres C A'C Time rime IrRensaly iricrmrrt Inc;rmrrt Grass Lawn 9 011 015 0152 (min.) (sec) (in /hr) - Hoase Roofs 0.161 L} 90 11145 i91'M 7 33 52 3.94 5 300 4 58 10 6DO 3.2[} 15 900 247 2(1 120a 1.98 25 i Sm 167 30 1800 146 7otai Basin Area, acres = 1 172 35 2700 1.30 Camposite Runoff Coefficaerd = 0.253 4[] 24IX0 118 , - Comhirsed (Area ' RunafF Caeffiaeetvt} = 0296 45 2700 107 50 30L10 100 55 33QtJ 0.92 60 3600 0.87 TIME QF CONCENTRA7101+1 (minutes) 65 3900 0.82 , 70 4200 0.80 Tc (overfarrd flow) Tc (gulter ffsw) 75 4500 O.TI 80 4800 tl1'5 ct= a.~5 L2= ❑ • ss 5100 0.72 Zi ~ 0 90 5400 070 L1 (A) = 95 72 = 0 95 5700 0 69 N(A) = 0.5 B= 4 100 6000 0 67 S(A) = 0.0053 n = 4 s = k] Tc (A)= 7 33 d= a Ll (B) = 0 Tc (guc•) 000 N(8) _ 0 7c(R+B} 7 33 S(8) = fl 3c tolaI 7 33 ErttersitY ° 3 94 PEAIi DISCHARGE, 1OYF-AR STl3RM: Tc (B) = O.a Fiolding 0.[]0 Q=C"1•A= 1.77 +C.F.S. 0 (est[mated @d) - ❑ 00 c.f.s. Tirm vF Concentaton ~ 7.33 minutes . , i PA PCs) V, r' RATIONAL FORMULA HYDROLOGY DRAINAGE BASIN ANALYSIS for 50 YEAR STORM EVENT Date: 8117l98 Project Name: Middome East 2nd Addition Design: kwm Projed Number. 12838 ' omk FkL nl weor,nlrnlza3a.,es Sde Location: N 12, S. 34, T. 25 N., R. 44 E. W.M. Basin Name: M. Basin Description: Pre-Developmer►t _ Poirrt of Concerrtration: None SUBAREAS: Irrtensity-Dura6on for 10-year Storm Event Descrtption Acres C A'C Time Time Intensity Incrmrrt. Incrtnnt. Grass Field 1.390 0.25 0.347 (min.) (sec ) (inJhr) cm'srn 8.17 490.33 3 70 5 300 4.58 10 600 3.20 15 900 247 20 1200 1.98 25 1500 1.67 30 1800 1.46 Tatal Basin Area, acres = 1.390 35 2100 1.30 Composite Runofl Coeffiaent = 0.250 40 2400 1.18 Combined (Area ' RurwH Coefficient) = 0.347 45 2700 1.07 , 50 3000 1.00 55 3300 0.92 60 3600 0.87 T1ME OF CONCENTRATION (minutes): 65 3900 0.82 70 4200 0.80 Tc (ovedand flow) Tc (gutter flow) 75 4500 077 80 4800 075 Ct = 0.15 L2 = 0 85 5100 0.72 Z1 = 0 90 5400 0.70 L1(A) = 190 Z2 = 0 95 5700 069 N(A) = 0.3 8= 0 100 6000 0.67 S(A) = 0.0053 n = 0 s= 0 Tc (A) = 8.17 d = 0 L1(B) = 0 Tc (gut) 0.00 N(B) = 0 TqA+B) • 8.17 S(B) = 0 Tc total 8.17 Irrtensity 3.70 PEAK DISCHARGE, 10 YEAR STORM: Tc (B) = 0.0 Holding 0.00 G=C•I•A= 129 C.F.S. Q (estimated @ d) = 0.00 c.f.s. Time of Concenh'atim = 8.17 mirndes ~r~~ 1{ ~t.Y.y. ~y,~ ,ys- • ' p ~y• 4 " ~ _ C b 4'"'~'1 Y1 '"ir\-!:W - R' . . '-^.Y - .n ' `'-'?w~sT.+ R4YlONAL FC]FtllAllLA FfYDRQIOGY C]RAIi+tRGE BASI[V ANALYSIS for ZO YEAR STORFdI EVENT Date• 8117M Rroject iVame Midilame East 2nd RddMon ❑esign: iawm Pres;ect Num4er. 1 M8 orokFqie ni vabwi2nlMi2s3s.xds Ske Lvcatcan. M 1/2. S 34, T. 25 iV.. R. 44 E. WM 8asin Name: M. 6as+n Descnptivn- Rosi Develapment Paint af Gcsstentrdhon None 5U6AREAS, Intensrty-Ourabvn for 1a-year Storm Event []eswpiion Acres C A"C Time Tine Iritensity lncrmrvt. Incrmnf. Grass C.awn 1.019 015 0152 (min ) (sec ) {itt,lfiir) Huuse Rtsafs 0.161 0.90 0.145 lAM•say 7 33 43952 2.74 5 300 318 10 600 2.24 i5 900 1.77 20 32DO 1 45 25 1:5Q0 9 21 30 1 aw 104 3ofal 8amrs Area, acm = 1172 35 2100 091 Ccm7poste Ruraff Caeffiment = 0.253 4[] 2400 0.82 , crambffvee tArea •Runoff Coeffiaenty ~ 0.296 45 a► DO 074 50 3000 068 55 3300 a.ea 60 3600 0.61 TIME a€ CoNCEIdFRATI[]N (minutes). 65 3900 060 70 420D 058 rc (aysrleard ffcaw) Tc (gulfarllow) 75 4500 ❑.56 80 4800 4 53 Ct = 0.15 L2 = 0 85 5100 0.52 Z1 ~ 0 90 5400 050 L7(A) = 95 7-2 _ 0 95 5700 0 49 N(A) _ 0.5 B= f} 100 fm O.48 5(A) = 0.0053 n = 0 s= Q Tc(A)= 7.33 d W a L9(B) = 0 Tc (gui.) Q.Ot] N(B) = D Tc(A+g) • 7 33 S(B) = D TC tcAal 7.33 Intensty > 274 PEA14 D15CHRRGE, 10 1'EAR STDR[N: Tc (8) = 0.0 Hokfirsg 000 ❑ =C * I' A = 0.81 C.F.S. Q fesbrrated Q dy = 0L1 c.f s Trre af Coramvabw = 7.33 msnutes _ Rapcass _ . ~ r_ . . . ; , , . , , , RRiIOPiAI. FORMLILA 1-1YDRL?LqGY DRAl1d/AGE 8AS1Pk P1NALYSIS for itl YE14R 57ORM EVENT ❑ate: sr~7m Prqec! Name• Midilasrte East 2nd Addibon Desigr+: 3crvrrE Pmject Ntsmber 1 ZB38 rrisk ~'~ta: Ai V=onnswi~ebaxis Site Locaton: N 1r2, S. 34, T25 N, R. 44 E. 4fU.M Basin Name. "M' 6asin Oescnption- Pre-DevelopmeM Pnirrt of Concenirafiaro: IVnne 51JBAREAS Intensrtv-Duraticn f~~ 1 0-Year Storm Everrt Descnption Acres C A C rme rme r~ensy irscrmrrt. Incrmrrt Gtass Field 1.3go i7 25 0347 (mtn ) (sec,) {in.lhr) W'60 817 49033 Z58 5 300 318 10 600 2_2a 15 900 1.7'7 ZO 1200 1 45 25 1500 7 21 3[] 1800 1 Gi Totar Basin Area, acres ~ 1390 35 2100 091 . Composite Rurwff Coeffmiert ~ 0250 40 2400 082 Cambined (Area' Runoff CaefTiciert) = 0 347 45 Z700 074 , 5(] 3000 068 55 3300 064 - 60 3600 osi nME aF caNcENTRan❑nw (minutes): ss 3900 060 70 420! 0 58 Tc (CIVBf18fPdRpW) Tc (gflftI° IIoYY) ~ ~ 056 so 4$dHl 0.53 ct= 015 L2 ~ o 85 5100 052 - zt = 0 90 5400 0.50 Li (A) = 190 72 = 0 95 57im 0+19 N(A) = ❑ 3 B= 0 1 00 6(30D 040 S(A) _ [30053 n = 0 ' s= 4 Tc (A) ~ 817 d= 0 - l1 (B) = 0 1'c (gut•) 000 N(B) = 0 Tc(A+B) 8.97 S(B) = a TC toal 817 Intffmty - 258 PEAK DISC14ARGE, 10 YEAR STmRM: Tc (8) = 00 HokiV Q L1D C" f' A= 0.90 C.F.S. Q (es&nated @ d) - 0.00 c.1.s. Turre oF CmVmThrabon = 8.17 msrutes I - i~~ Y. . "r• t~'u i' + V~ . , ~~~Yi ~ ~"y( } . L+ . . . 1* •*5~0 • • - - , % S.e,~a'.'~a•ix:~r TYy a depth of 1.2' 4-4.1 Drywells Precast concrete dry-•-~ , ; wells, as shown oa County standard "V-I.486 82/3 S 1/2 B= Area drawings, map be used to retain storm ; drainage in soils with a ver}r rapid per- n Wetted perimeter meability. Tqpes A and B Drywells ia the following soils may be desigaed to = Z'x1.2'+(2x1.2x1.2) ~ 5.28 s.f. infiltrate a rate of flow of 0.3 cfs aad 2+2(1.22+2.42) 7.36 ft. 1.0 cfs respectively: Bong Marble R = .7I7 Bonner Phoebe Garrison ~ npringdal 2/3 /2 V - 1.486 (.717)(.02)1~ 5.61 fps ~g~ The locations of these soil types are .03 shown in the Soil Conservation Service Soil Survey for Spokane Couaty. The Q~ VA ~ 5.61 fps x 5.28 sf ~ 29.6 cfs draiaage report shall include a copq of' ~ 30 cfs d- 1.2' . the SCS map with the subdivision-plotted. thereon. The County Engineer shall re- quire the developer to provide a sieve Solve Dc: Try 1.3' analysis and soil type test from a soils Iaboratorq acceptable to the County En- Q- g(b +a Dc) 3 Dc 3~2 gineer if there is a question regarding b+ 2B Dc the above soil tqpes. 3/2 In rural areas, as defiaed in Spokane Q=432.2 (2+2x1.3)3 g 1.3 ~ 30.9 cfs County Rcad Standards, opea gravel dry- (2+2X2X1•3) wells may be permitted ia lieu of the 30.9 cfs - 30 cfs dc = 1.3' precast concrete dry"'ells. D> D, flow is supercritical. Precast concrete drywells proposed for• c n use in other soils than those shova Since the flow is supercritical, care above aad all open gravel drywells-shall , should be taken to provide a proper de- be desigaed according- to percolation. sign at points where horizontal and/or rates determiaed bq a field test con- vertical alignment change. forming to the Hanual of Septic. tank. practice. A County- iaspector- shall be, A free board of .30d should be applied present during all percolation tests. A. percolation test calculation sheeC D-.3U R 1.2 - 1.56' sigaed aad sealed by a registered civil engineer shall be submitted. The per-- V- 5.6 fps > maximum allovable. colation rate shall be equal to or greater thaa 72 inches per hour to be Provide rip rap. (Refer to Section acceptable for drywell construction. 4.5.) 4-4.2 Storage Facilities - Detention ~ 4-4 Detention/Retention Spstems -The atorage facilities may be used to peak rate of rua-off from aa existing regulate flov rates. An overflow • site shall not be increased due to the type storage system which regulates the proposed development for a given design rate of oatflov ehall be ueed. See, storm. lherefore, a retention/detea- Pigures 4-3, 4-4, 4-5, and 4-6 for tion facility on-site will be required. Suggested details. Iandscaped facil- ities such as parks, playfields, teanis DaLa: 414184 courts, etc. are recommended for 4-15 ~'~~s':'.~.~ ~ , "iMe1h~•~~F.C?~fC' ' Lf J"'I+.tr:a+1[+xV44'S~' S`d~17:,9fl,,~:Y` ~ ~ + ` d • ' ? • MfilDmB Ea5'C 2I3d Add1tiDI1 S1gh# D15t3I1GB AI1alySi9: VerC~er Dr11Ye Intersection of 35'hAvenue with Vercler DriVe Intersectian af ' )e Avenue with Vercler Drive Sight I]istetnce Reauired: Equatians and figZres from AASHTO- Ceametric Design af HighwFays and Streets were used to determxne the sight distances requrrei for a car waiting ta rraerge onto Vercier Daive. The #`vllawing criteria were also used: I . Vercler Drive is a jocal access street with design speed of 30 m.p.h. 2_ The stvpping sight distarice is 200 feet. 3. Driver's eye is 16 feet behind the cusb line vn Vercler Drive, and driver's eye height is 3.5 feet above raad. 4. TYie object height ar oncoming vehicie height is 4.25 feet. Case B-1 Left turn ontm Vereler Drive across vne lane of traffic with vehicie apprmaching from left. d _ (1.47)(V)(J + Q = (1.47)(30)(2 + 4.8) = 300 ft. d= sight ciistance to the left alvng the major highway from the irrtersectian, ft. V= 30 mph, design speed an the majar roadway, mgh J = 2 sec. t. ~ time required to accelerate and traverse the distance tca clear the trafEc in the lane , approaching from the ieft. Tliis distance is the surn of the ten fvot setbaek tQthe stvp 1ine, the length of the Vehicle, and the distanice traveled to cross the appasing lane(s) (appraxitnately 1.5 x lane width) t.= 4 8sec. frvrn FigurelX-33 far s = l0' + l9' + (1.5)(2D') = 59' Case: B-2b Left tum anto Vercier Drive across one lane of traffic and rnerge with traffic from right d = Q -h = 349' - 56' _ 293 ft. Q = (1.47)(0.85 x V)(J + ta) _ (1.47)(0 85 x 30)(2 + 7.3) _ 349 ft. V = 30 mph, design speed, rngh J _ 2 sec. t, - 7 3sec. from T'able IX-7 for V=(D.85 x 30) _?5 mph, and P = 140 ft. h = P - 16-V.G -L = 140'- 15-49'- 39' = 56 ft, _ P=14a ft from Fig. IX-34 for V={[} 85 x3O} _25 mph V G= (1 9){0 85 xV} _(l 9)(0.85 x 30) =49 ft. p;' +.-..x;'~ y W!~ FYYr,i?iii•n-1FAs - n _ - a....... ' _ - _ li ~ Lli-T, } T" rr ',~y • , - G . - nvJtx+ ,~.a. . r . r . . t. _ • _ . _ , , , • ' MdH[]IEl~ East 217d Add1fYC7n S1ghL D1StSI1Ce AnalyS15: VeTCiCI D3°1Ve Lxtersection of 35'` Avenue with VercIer DriVe Intersection of;b'h AVenue with Vercier Drive 5iaht Distance Reouired (eontinued) Case: Cb Right turn cantv Vercier Drive and merge with traffic from the Ieft d= Q -h = 349' - 58' = 291 ft. Q _{7 47}(0.85 x v)(J + ta) = (147)(0,85 x 30)(2 + 7.3) = 349 ft. V= 30mph, design speed, mph r = 2 5ec. ta =7 3 sec. fram Tabie LX,7 for P= 140 ft., and V=(0 85 x 30) ~ 25 mgh h-P-14.3-VG.-L = 140'-14.3-49'-19'= 58ft. P= 140 ft. fram Fig. IX-34 fnr V=(0.85 x 3fl)= 25 mph V.G. _ (19)(0.85 x v) _ (1.9)(0 85 x '30) _ 49 ft. E .~'s'r~'~'^"r. •~~7 Aµl`I . s'~"~-Y'1';Fe~aitT''¢ , ~ , Jn-is.+l.sy•~=+a,r{y:,=• : ~g Iv[idUori'te EasC 2nd Add.1„tion 5ight Distance Anaiysis: 35'h AVenue and 36'h Avenue Tntersectian of Virginia Street vvi,th 35'° Avenue Imersectian af Virginia Street with 36'h Avenue Sip-ht Distance Reouired: Equations and fgures from AASH'Ta- Geometric Design af ~Iighways and Streets were used to deterrtiine che sight ciistances required for ac~.r.r waiting to merge anto 35`h Avenue atid 35'h Avenue. The fQllowing criteria were aiso useci: I . 35'h Avenue and 36`h Avenue are local access streets with design speed af30 rn.p h. 2. The stopping sight distance rs 200 feet. 3 Dra►aes-'s eye is 16 feet ~ehinsi the curb line on 35`h Avenue and 36'h Avenue, and driver' s eye height is 3.5 feet above road. 4. The abject height ar vncorning vehicle height is 4.25 feet. Case: B-I Left turn onta 35'h Avenue (or 36hAvenue) acrass one lane oftraffic 1vith Vehicle apgroaching from left. d = (1.47)(V)(J + ta) = (1.47)(30)(2 + 4.8) = 300 ft. d= sighk distance ta the left alvrag the rnajor h.ighway from the intersection, fr. V = 30 mph, design speed on the xnajvr roadway, mph J - 2 sec. ta = tirne required to accelerate and traverse the distance ta ciear tfie t~'ic in tlze larae agproaching from the left. "This ciistance is the sum of the ten foot setback tv the stvp line, the length of the vehicle, and the distance traveled ta cross the appvsing lane(s) (aPProximately 1.5 x lane width), ta =4.8 sec. from Figure IX-33 fQS s=]0' +l9' +(1.5)(2D') _59' Case, S-2h Left turn onto 35t` Avenue (or 36~' Avenue) across one lane of traff'ic and merge with traffic from tight. d=Q -h = 349' - 55' = 293 ft. Q _ (1.47)(0. 8s x v)(1 + tj = ( 1.47){Q. $s x 330)(2 + 7 3) = 349 ft. V= 30 mph, desigrt speed, mph J Z sec. ta 7.3 sec. from Table I7C-7 for V=(0 85 x 30) =?5 mph, and 1P =14Q ft. h-P-16-V.G -L = 140'-16-49'-19'= 56ft - P= 140 ft from FiL IX-34 far V=(fJ 85 x 30) = 25 tnph V.G =(1 9)(0 35 x V) Y(i-9)(O 85 x 30) _49 ft. 19M~x;~~F~~" 'a=Y•w'.'rt; w .~R: • ° _f}~~r.`~l~t'f~' „^*z~,'~i', k,irt~`'~~w t+• . '7°,!!~ 11Tdilome East 2nd Addition Sight Distance Analysis: 35`h Avernie and 36'h Avenue Intersection of V'uginia Street with 35'h Avenue Intersection of V'uginia Street with 36'b Avenue Sisht Distance Reauired (continued): Case: Cb Right turn onto 35`h Avenue (or 36'h Avenue) and merge with traffic from the left. d= Q-h = 349' - 58' = 291 ft. Q=(1.47)(0.85 xV)(J + ta) _(1.47)(0.85 x 30)(2 + 7.3) = 349 ft. V= 30 mph, design speed, mph J = 2 sec. t, = 7.3 sec. from Table IX-7 for P= 140 ft., and V=(0.85 x 30) = 25 mph h=P-14.3-V.G.-L = 140' - 14.3 - 49' - 19' = 58ft. P= 140 ft. from Fig. IX-34 for V=(0.85 x 30) = 25 mph V.G. _(1.9)(0.85 xV) _(1.9)(0.85 x 30) = 49 ft. • t . ' . , . _ .a . - a. . ' ' - ~ . rw • ' . _ ' ~ ~i°= s .~].,-r": Mdilome East 2nd Addition ~ , ~v':s.: i~_" `~v'~vs~x ~sva^.r~ s ~ . _ ~ _ 'svr"~e., } • 3 - i ROADWAY S[7RF~CING DESIGW: The Spakane County Alternative Pavcment Design {Triterim} for LocaI Access Pavement Stnuctures was used for design of the rvadway surfacing From the table, Lacai Access Pavement Structwes, the foilowing infonnaiian is needed to detern3ine the required sur°Facirtg depths. 1} The type of street must be local access. . SaYp type (as classifred by the Unified Soil Ciassificatian System) 3) The average daily traff'ic, Ai]T 5treet Type: AlI streets within the plat are designated as IQcaI access (residential). Svil Type: The -evtechnical engineerang report shaws that sQii samples were taken at 3 test pits within the plat. TP- I was at the intersection of Vercler Drive and 36`hAvenue, T'I'-2 was at the intersection of 35`~ Avenue arid Virginia Street, and TP-3 was at the intersection of 36`h Avenue and Virginia 5tt'eet Gradation analyses show the soil sampies faona TP-1 are classified as CiiNt TP-2 are classified as SK and TP-3 are ciassified as GM based an the i3nifaed SoiI CIassification System notation. {See geotechnical test results} ' Average I)aily Traffic, ADT. Vercler Drive will ha.ve average da.ily traffic cvun#s of less than 200. In the future, this rvad may be extended south and the E+iDT caunt wili probably increase to the 200-600 range. Therefore, this road wwillll be constrtacted at 100°/v build out for the future condition. ~ The remairung rvads, 35th Avenue, 36th Avenue, and Virginia 5treet, will be short crass streets each with average daily traffic cvunts of less than 200, 1 A table of the street narnes, design data and the roadway surffacing depths is nncluded. SUMIVfAR4' UF ROADWAY SCJRFACING DEPTHS. S`IREE'I" 'NAa'A'E` , ` ST£tEET. TYPE'~ ` SUJL;`I'YPE T: . , ST.JRFACING±` . . ~c~: : ' ` , ° ~ A. . • , zv _ ,c>~.~•n Vercler Dnive Local Access GiM 200-6043 2„ ACP Class A $SSL1me5 1 0d°~G b1111d [)li[ T" C1'L15hed SlirfaC4rig 3 Sth Avenue LacaI Access sm 0-200 2" pe+CP Class A T' +Crushed Surfacina36th :~venue tacal Access GND 0_?[?0 ACP Cl~s A a 6" Crushed Surfaci~iz Viimnf[L SiiGei LiJi,at4 `~i1+4~~5 VEr'i-ti7'1Vl 0 -?00 7"' fSCP Clas$ A r T' Crushed Surfacins-, "t'-'"`tdw ~r_:9'e+! n+~~e•nn.~..~r a - " - s . ~ • - LOCAL ACCESS PAVEMENT STRUCTUR'~S AVERAGE DAILY 7RAFF3G SO1L 7YPE 0- 20(] 200-600 604 + GW 2,l/6„ . 2'1/6" 2111611 GP 21761, 2r77,i 2s,fT„ (51,6- (Z„IT-) 211/811 L JC 2"ITe ~7~~ fpe~ 3'1 f61' L 1 t~ ~ sw ~r,^1761 2llIai 21711 ~fl SP 2'1/61' q11~7Tp 2-~~8ir ~ ~r ~711i1 ~~'l~~ 2'1/8„ 3n1UG01 L sC Pavement ❑esign ML 311/61' 30118T, 4!1/611 • - CL Pawement []esign OL ,~PITI $11/7 5r,{~~1 MH Pavement Design . OH Pavement Design PT Paaement [3esign 1) Soil type is cfassifec3 by the Unified Sail Crassifca#ion System. 2} Required thickn+ess is gaven as inches of asphakt concrete pavement aver inches af crushed sur€acing. ,w~'°9'ue A !s:l'f*s'~ ~~•~,r~ a4 ~~.....h 1 a''~ i!"A'.,l~~tT :~r-~..~m. = e,rrXr.a1s~ ~~~iy i I ~+L i LKa~rr~ I r rtv~Gtr~ . , • (INTERIM) , ~ ~ Tq•.. bs"-,B».3~ . ~~ASi1R~~'+7'._Kr t~FC-.iC1n~ 't~ y.r,.:.•~',SG`^.:i%c~'.~ ,~i S i F'~ a l a 0r6TFf.kx1i:a4 C1.41N[tMNC a Ir4lFr11l+l:i dL39NO ~ ~lr~tlH.4f:y~ra Fid.Fefrnmy¢: ^yw: ItA:+.+fwr+ wwqwiI. •isl rd l• SrlAG 1 f ar,'JLgIli'll••~elJ 7 r: irrN •.iRii:~?%!~'~JGO"K Octobcr 15, 1998 Client No. SIIMqC'r Projext Nv. 598NUS G Rctcrc~~c No.: SL4377 Mr. Kcvin McMull+in Simpwn F.nginecrs, Irtc. 909 N.14rgnnac Pwad Spvkane. WA 99212 Projcct: Midilatne l-'ast 2nd Ac3d'ttinn Date Received: Oclnher 6. 1998 ' Daie Tested: C7ctabcr 6, 1998 I.cacati can : ' Wh and V crclcr Dcscription: 13rawn 5i 1ty ~`~raael (~'~M) , S1y-VE sI'LE ~ PL+RCF.NT PASSbNG ~ i44 2„ ~ 77 . a" t 71 3/4" I 66 ~ ~ i i2" I 59 3rglv 53 ~ . No. a I 42 i+lo. 10 ~ 33 No. 40 1 ~ Na. 80 ~ 27 ~ . No. L~~ ~ ~ ~ No. zvo ~ 20.3 , 5incerely, ST'RATA, [NC. • ~ Kiclc Wnndwnrth 'l'iming Services Massager R.IW:kh -0 ~...".7:s~.. , • ~ [Ly' • rYrC 4 .ItI... • tii ve~'.. - ~-~i• - ' - v~•~~..s.~ - - - - - - ' 4•Y- ~ ~ BPni►c:a~i~i~tENdKEEn~~t •+~•e~~*~~T~rnH~ i4d+N !ii-rrer+kl. LiAA' as4 ZiAn siat Id a+:e.,16 wnW:+6 1-gSi i f14T:CMW 2iT12 I R'RCd[JIiI.".{-ka ESfXW ()CLI)bL7 15, 1998 C,lieTII No. StMFNCr f'rvjcct No. 598iWSC: Reierene:e- N«.. 5T.4:377 Mr. Ke►ri°n McMulkin iirnpsan Enginecrs. Znc. 909 N, Argnnne Rci:sd Spakane. VI#A 99212 Prvject midilome F.ast ?nd Aeiciitiean Ddie Received: C]ctober 6, 1998 T7ate Tested: {7ctnber 6, 1998 f.orafion: 351h and Vir,ginia , Description; Arnwr, ,Silty Sans3 with C'rr'ave] (SM) S1EYE SI'LE YleRCT{:NT PAS58iNC ~ ~ 1 1 fT, 100 1" 1 92 ~ 314" I 90 1 F 2s~ 78 3►'8" 71 Na.4 h 54 No. 10 ~ 41 No. ~ ~ ~5 No. 80 ~ 31 - No, iov 30 ~ No. 200 24.2 ! Sincerely. STIZATA, INC. Ricic Wcaodwnrth '1'estang Se;vices Mamgcr RIw wh • A..a . . • _ C+Nt: ~rs~~ vG', . • . EC.~ , • ra•.:tit1bC . ,C i.ra~~ ,~av ,~«a5d'~ ~ rc ~""x.*~`~a~,a~~~~~ , • _ , . . _ ~ ' ' '~ti""'et` ."~~s''_w•~~_~ '00t s i r~ 3 i 4ildCCC411FtCN RNLiINMtM1s1Y r W4TE151AI:i 11"41114[: ~ 4i:MN Yaneias k1d. dU&YrrT~:..rs4a 1f!„:4JULafts. w7!lr3+ft :'v,1.1M!!1 4!~f11 ! IP:e~5CK1EAl1.Rl1~ r fx~ir.7dC3`13l4.~lf~1Ci1{~t~t C3cltaber 15, 1998 C:liGnt No. SIMENG Prnjee:l No. 599MISC Rcfc.rcnee iVa.. SL4377 Mr. Kcvin ?VIcMuIl:in Simpson Fngineors, Inc. 9og ?~.11rga=c Raad :Spukane, WA 49212 Project: Miciilomc E,= 2nd Additinn qatc Rcr-cived: {lctober C, 1995 ' C~cio~ier 6, 1'~5~3 , ~3~'f~~te~l: Location: 36th aitd Varginid T]escriptinn: arvwrs Silry Ciravci (LiM) , ~ SiFV'F ,jJZE ~ PERCENT YASSINC+1 2" ~ 14lo 1 ] /2" I 9' 1sl ~ 81 314" I 7~ 1/2" 67 319" 62 ~ • No. 4 46 ~ No. 10 1 33 Nca.4Q ~ 25 No. S[] 23 No. 100 '2 , No. 200 l 18.3 Sinc:erety. STRATA. 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"P''~ r . :.5 4 : $ ~ , . ~F`: ` , . .r ' . • 3: ~ . _ _ • . - ~ . - , . ^ - • . ,J'- . ~D`~ _.i . . v ..v'`v'V,'~p,,~~'µ [ ~~~{-,r . !'~:t5r~~~ ~F.: Y~' ^.y . ,~;r''*~'!_.~"' I ;y.~:r' ~ • _ °~«:w`:;~rw, ,r. 84 SOIL SffR1EY ' , ` ~ • ~ . . . . - w ry , ;ZVO~ ~ . TAar.E s.-Brte f descripttans o f ~vi73 ua~d th,ear` f'`~'• - - ~ ~9 ~ ~ 4e8tied pkysical and chernical pr~~~.. 2 . ' Classifranoa f . ~ De th ~ . . . ~ala~an--Contauued Pere~t,age py~g ~ i. : ~ , . ~ . 1 aa 5a1 name IJescriptian af sofl and site irom 31 ~ At-~a~le R , sYmhnl surtace U5Dr1 temure ' ~ai&ed `~a. 4 No. 10 N a ~ P~meabil9t~.' nsr e. ; I{eacEaon F]ispersfan ~ . , .~fiH4 (4.7 mm} (20 mm) {p.0~# csQncttr R(1:5 di.uuon) PeteuLai c rnyn rn. co~ SpeWe verv sfanp sUt loam, 36 to iD Verq deep, well-drailned, meciiium-rzstiured ti°erv o ~ so Feer stanv ~lt perceut slages. stanr sn3l; parnnt matesiul cansisrs nf laess, Poa~a rd ~•err G.r~ L____.-- ~!-2_----- 30 tu 50 20 to 5D ~ ld to ^S # 0. 5 au" 5, 4 S sa U. 0~ B. figo 3~oders ' rulcawc :ul~, and lucal colluv~um. cobblp loam. • ' J , Le--- Lazr. 4 1 ~ , SoC 5pnkane laam, 0 to 30 gercent slape5. Weli-drsiaed, mnderatel}- caarse tessnred saiIs ' p to IT Loam to gmrellp Ba t, 95 ~ , SeD Spnlcaoe loum, 30 ~ 33 perceut ~Qpes. farmed imm ~re, gneLss, seiusc, ar ac~d ssndy loam. 50 w 84 l,i to ,p ; p. Sto 2.31 0. pS iro w p. ]Q : G~ i~a 5~Ii~ ~ I fm 3d t~ 60 mcndepah to bedrack ranges li to ?S Grn`v loamr ellq s~nd. coar:e ~5i-CP---- .4'~,----- 70 ta 34 50 to 80 ~ S to 10 a I 0 m 10. 0 0. U7 4 to Q 4; f G. B w". 3 Hsgb Lon. ~ 5rC Spa6ane stanp lvam, 0 to 30 percent Similar to Spakaane laam sails, eicept that tbe s lope& surface lapee w 20 to 50 percent srones. SrE Spokuae stony loam, 30 to 1-0 perreeist _ 1 sl°pes` SsC $gokaue camplea, a to 30 percent Spoiane 1Qem, moderateis s5a11aR, part similar ~ • slapes. to $pokane laam seiLs, escepti thut the depth ~ 5sE 5pekane camples, 30 to 70 percent to bedror,k is hertveeu 20 and 30 mr.hes. slapes. 5~~ne loam parr is similar to Sgn6ane ]onm ~ ~ • ~ ' soi3s. I 5tC Spakane vary rocL-q camples, 0 to 30 5po6aae Ioam. moderaEelr shdlow, psrt simalsr percenti slopes. W Spobuse loam soAs, escept that Ehe degth StE SpoJLane rerp rochy eomples, 30 to 70 to 6edmck is betlseen 20 and 30 mches. ~ i • i percent slapess. Rock auccmp mciuded in these very, rockp 5uE Spo6ane eatremeip rockp comples, 20 oompleses. . ° to 70 perCeat slupes. ' 5w8 5 nn8dale vellF sandY loam, 0 to Same~vhat rscessivel~ dra~ned, vellpmod- Q to 12 Crave!] contse I 20 ~o ernuir caarse testured seildeveia irara sandr Iaam. 5~~_------- i~ W 8~ 50 to 80 10 ta 24 P~~ glacial outRash af acid i3n eous an a•d occurs 12 to 46 Gravell coaise a~ to lU. 4 Q pi to Q lfl a 6 to & 0 Hig~------- Low. ~ . P G1S-Gl'---- A-1 63 to ia an nearlp lenel to geutlp slopwg glacinl sand, 30 ta 80 a to 10 _ ~10 CL 04 to Q Oi G. i 4o fi. 5 8'igit._---_. Loiv. nutsrush cermces. ' SxB 5p0riugdale graveUy sandp losm, deep, Similnr to 5pringdsie gravelly sandy loam, ~ . ~ to 20 percent siapes. 0 to 20 perceni slapes, eacept that the r3ept}► to j' ' gmvel and coarse sand is mare than 36 ieiehes. . , 5y$ Sptingdale cnbblp sattdq faam, 0 to 20 6imilmr to Springdale 6ravellp saQdr lonm, 0 to gerceut sivpes. :4 peneut lopcs, eacepe Ghat the surtace F ' , I laver is coh6lv. 5zE 5pringdale grarellp loamy 5und, 30 to Samewtint eiccssivelY dramed, 8ravellY, coarse- fl to li Graveflu laamv ,yyf. _~-I------ „ 70 gercent slopes. t~tvred so~ ou temsce 6rsaks and steep s~d, - r 0 to 80 ~0 to Sfl 10 to _Q > 10 Q Q~ w Q p; ~ to 3 ~ ~seAr casrse ~ slaP 1 es oi maar dra~~3evays; P~st maTe- li to 60 Very 4U to $0 30 to 50 o to ia ~ r Lon. . rf~ doman~dy acid igneous roc6. send. a 1a Q 02 to 04 i G. fi to T, 3$igb Loce. TeB T~oa~ vdly sdt loam, a to Rfl percenc ua~ea ` a~% so d vela ed fmm sd- to 3S Gerr ~5 vellsilt lo m.. 65 to 90 '0 to S4 40 to 60 A S to " 5 jq, i_ to Q 14 f S. fi to 7. 3 Jf nderate._.; Lon•. . i eC Tek on gr~vellp silt laam, 0 to 30 swae, qunnzice, schist, or s'n~uie an hiEl~~ to ~ "C1~'_°--- 30 to 60 d to 50 10 to 20 a 0 to YQ, 0 percent slopes. mountatnous upiands: depth to suadswue ll. 05 ta 0. 10 5. 6 to 8. 0 Hign------- ~ Low. p TeD Tebon gravel]}• silt laam, 30 to 55 6edrack ranges imm to 30 inches. f t E , ~ ~ pcrcenT slapes, Tkp Tckaa, ven• racbr comples. 25 to 55 Te&oa pan amiiar to Te6aa eraveLlr salt ]oam percent il;lopes, soils. Racs aurerop induded in ahis cQmQles. ' LIhA U'hIig silt Foam, 0 to ^ perceat siap~. Deep, medium-tctcurnd, red]-dra~ned snils ' 0 to fiU Silt lnam to e•err Bne '9i;, to CL_. 9D to 100 Eo to 95 ! ' ~ L1hd L'hlig silt ]aam, S Lo _0 percenc slopes, formed from glacial uA miaed wiah loess snd sandr lasm, 35 to SD p, 9 to 5 i-~0, 1_1 to 0.^_B ~ G co 3 lfodcr3tc _I La~s to vols~c ash in 9he upper psrts. I7utu alsa applies to [3blig pnts of Cheaer und Uhlig silt i moderate. Ipams (Cn9) and af Cheney-Dhiig comples (Co8). UmC Uhl,ig silt loam, moderately shallow, 5 5imilar to GhLig sslt loam, 5 to 24 perceat ~ to 30 perten; :iQOes. slopes. eaeept thati depth to bedrock rances I d.. .r q I J I I I • I ~ ~ ~r .Mea'~~'. _ _ • _ ' . _.w_ _ _ ~ .,.y-~.~---.-.-.Y.m..~.,.~ . - _ - ~ =I _ -_.a - . . - - . . - . ~ - : ~r-:-.; w_ _ _ _ , - - • . • ,v . ~ . . _ . , , _ . '~y~.,,r . ' 4 74 sazL sURVEY ~ spox&NE couN-ri, wa_,r~Grox 75 TAHLE 6.-I3TdEf dleSCi bptiQ163 Qf aotiIs amd tlieti^ ~=s ~ estimaxed physicat anct chern.acaZ properties-Continued Cl~sificstiop i ~assificaiion-Conwnued Percenfage pasiQg sie~~e--- I?epth ; . ,lt•uilable 1[ap S6il name Descnptian of soal and site from e perineabilitq wacer Itesctian Dispersian Shnok-sirell ' sv mboi surfacc ~ i \o. 4 tia. 10 \a. 2U0 I caqneitr {t:5 dilutian} pntentual USDA teaiure i ' IInited AA5H0 (4.7 mm.) {2.0 mm.} (0.074 ' s mm.) ? I)sC Dragoon stony sdt laam, 0 to 30 percent SimiLar to 17ragoon silt lQam, 0 to 30 pereent j rn• r~ ~r, fn. y[f oA, ol d9tJ px ~ ~ slapes. sIapes, excepc that the surfuea layer is stan}•. , DsE) Dragoon ston}• silt losm, 30 to 55 per- cent 5loges. i . 'DvD Dragoon ver~ rock}• comple!:, 20 to au Dragoon part similtu to Dra~aon silt loam, 0 to ' perceot slapes. 30 perceat slopes, e.~cept that depttr to hed. rack ranges irvm 10 to 20 anches. Rock out, ~ ~ cr4p mCluded w this complex. e ~ • EkB E]oikn silt laam, 0 to 20 perccnk slapes. liedium-textured, weEl-drrninedsail farmed froin 0 to 24 S1lE l93D]----------- ~ hqL-CL---- A-4------ 86 to 93 80 to 93 GO so -rU 0 8 ro 25 0, 17 to D, ?D 6. 1 to 8. a fTigh Lan- to mod• glacial till cantaining a large amount of toi- canic as~ in the surface layer; underlatn by 24 to 44 Gra~vellp loam - D, 5 to 25 U. 12 to 0. 13• 6. 1 to 6.6 ffih Lotisate, i • gravel at depth oF 30 to 60 'ruches; occapies ~ to 53 Gen gr3velly saudy ~ undulatmg, marauzel~ke topo,raph}•. ia5m. ~ ~ ~ G~i-°---- ; A------ ~0 to 60 Q to g0 3S ea 1~ ~ a3 to GO Gracel-----..--:-- ? 3 0 to 14 G Q pG to 009 6. l to 7. 3 1 High------- Lnsr. i GP_----___ A 1_----_ ..a to 35 lp to 20 0 to a >lU 0. t)~! to 0 UG G. G cp i High------- Lmn. . EIC Eloika tirery stony silt loam, 0 to 30 per- Similar to E]viL•a silt lanm, 0 to 20 percent slopes, . cent slvpes. eNcept that thep are very stonp Ehroughaut. I, I EI[7 Elaikn verv stony silt losm, 30 to 55 ~ percent slopes. ' J Em EmdenE silt loam. Medium-textured, somewhut po-orly drained, 0 to 26 $;lt 4aAm_____.___,_ aiknliae 5ail formed in alluvium from calcar- ~~L,,CL, q_4 95 to 100 90 to 100 90109.5 0.9 to ? 5 0, 17 to 0. 20 i. S to 9 0 Iiigh------- Lo-w to mod• { ~ eous ailt, volcanic ash, and distonute; depch 26 to 41 Cerv fine sand,v ' ~,IL-------- 95 to 100 99 to 190 60 to ~0 0 S,~o 5 0 17 to 0. 20 7. 4 ta g 4 AFaderste___ La~r~te. ~ to water tahle Auccustes from a~eur the surFflce loam. ; to about 6 feet. 41 to 60 Sandy clay loam____ : CL-------- A-G------ 93 to 100 90 to 95 85 to 90 02 to- 0. 9 0.17 ca Q 20 fi 6 ia F 3• L4tit------- lfaderate. I~ Fa6 Freeman silt loam, 5 to 20 percenG 4erp deeo, maderatelp welf drained upland sotfs 9 to'?2 Sdt loam----------- • slbpes, nnt~ niedium-tae~uredaurface layer ~nnd medi- 1~L-CL____ ,~-4____.. 95 to 160 BO to 100 80 to 90 6 ~ ? *.o a. 8 0 li to U. ?a G, fi to 7 3 liaderate_._ I~on• tomoi- ' ' Fa83 Freeman s~t loam, a to 20 percent umormoderately5netextnredsubsod;formed 22 to 7., ~ S'tg cinp loam______ ` . _ ~ e~'ntQ• 1 slages, seuereir eroded. fram silt aa rolling to hilly uplanci5. - CL-------- A-G------ 9_ ~ to 100 90 to 100 80 to 90 0a 0 lr to 0, _0 fi, G to r 3 T,on-------- \Foderate. 1 FaC3 Freeusan silt 1nam, 20 to 36 percent , j siapes, severel,v eroded. E_ Fm Fresbt Nmter mnrsh, Shailow, swam pp, intermittent poads aad , fnnges uround lakes thaG have a Buctuating . rvater table. Engifleanng dasa 3s zofi, given, ~ ss lAnd tqpe,s too vnriahle. ' GaC3 Garfield siffti• elay loam, 0 to 30 pcrcent 1'erv deep, weLl-dromed soil cieveioped in laess 0 to s Silty clay loam------ CL A-B------ 95 to 100 $Q ta 100 90 to 93 0.1- to 0.8 ' 4 17 to 0. lfi fi. 6 to i. ; 13oclerate. slopes, severelv emded. on radgeeops and knobs an the mllmg ta hfllt 5 to_3 SilGv clnr________,__ CH ~_7 95 to lOQ 90 to lOQ 90 to 75 0 05 tn 0.2 0. 14 to 0. 17 G~i tv 3 Lo«------- Hi h u~lands sn the P~lause so~l area. ?3 to 84 ~ilty ~l~y loam------ C~,-------- A`6 95 to 100 90 to 1oa 90 ta 93 0. ^ to 2.5 0. 17 to 020 6. 6 to i. 3 Iam- ali~deraie. ~I GgA Gntrison gravelIr lpam, 0 to 3 percenG GraveLiv, medium-textured, somewhat exces- 0 to 15 Grsve]ly ]oam_______ slapes. sevely drained suils fvrmed sn gravelPr glncW 15 c-o 44 L'en• gravelly loamSM A`~------ 65 t0 ba 40 t0 50 33 to 30 0: 5 tt~ a 0 12 to 0 14 G 6 in 3 AFoclera ie La~r, GgB Gurrisaa grarelly laam, 5 to 20 gercenc auinnah material from a vnnatr af acid, ~k4 ea 60 5aod, gravel, and G 11 A-------- 73 to 65 30 to ~0 5 so 13 _ a to 4.0 Q. I~S to f~. ]d G 6 ln ; 3 tifadera#e__. LoR. :lapes. igdeaus pnaent rock; on aearlg ]evel ta mad- co-bblesmnes. ~ GP-------- 1-1------ a to 35 IQto _0 4to 5 i F 10 0 04 ,o U UG G G ia 73 I3sgi------- Lan•, eeately slaping terraees; depth to muture uf ~ sand, gravel, and cabblestanes ranges 3rom , . t4 a feEt. I , GmB G1ta154n very grarcll}• loam, Q to 5 Similsr to Carrison gravel]}• loam, eecept Chat Q to la g~er}• gravellr lflam. _ G~~ A_0 30 to Ga 20 ca 34 5ta 13 5 tn 5.0 O. GS io 0 10 ! 6, ; to 6 G :~foderate._ La~r. p ercetit slo~ies the sud;sce iager is ~~er~• grati•ell}•, 13 to ~4, ti-err grave21}+JaamG1t-------- 45 to Ga 30 to 60 a io 13 5t0 3.0 V 03 to 0_ 10 G G t4 7. 3 lImdente___ Ltirr.' - #4 to fi6 5and~ Eravel, nnd Cp------ ~ . A-1------ ~ to 3S 10 tq ..0 Q to 3 r10 U. W ca 0 UG 6. 6 ta 3IItgh------- La~e. • cobblestanes. GnB Garrisan ver5• stony loam, 0 ro?0 4imi1aT to G41T150q gs'svellr ]pam, escept that percent slopes, the svrface laver ss very atonv. ! GvA Glenrase siitlQam, Q taa pereentslopes. 1`erc deep. medium-teetured, well-drained so'rls 4 to 72 5ilc loum---.------- 141~CL.--- k-4------ 50 to 95 75 to 95 60 ca 55 f n. 5 ta ^ Go8 Glenroses~ltfaxm.5u?4perrenT slopes. tor~ned from acad igne9sas g[acial till, surface • a -•a 0~ 1 ta ".3 lindern:~._ Lo~v to ~ mnrlawYle GpC Clenrose silt laum, 20 to 30 perceat laver influenced br lmess nnd voleanic ash, an slopcs, gentlr rolling to sieep upinnds - I GpD Clenrose silt loam 30 to _nn± ~~uw~4~. i f I . I ~..,.a. I