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28094 PE-1751B MIDILOME 3rd Addition 2001, Jan Stormwater Drainage Report 'i , STU~ATER DRAINA~E REPORT ' and Roadway Uesigrz MIDILQME EAST 3rd ADDITION Jantiary 200t RECElVED V MAR 2 9 Prepared by: sPOKan~~ COVrTY ~NG'iNEER ~ . Siinpson Engineers, Tnc. North 909 Arganne Raa.d - SpQkane, Washington 99212 The design zmprouementts shorvn in #his set o£ plans conform to the agpIicable echtians of the Spokane Caunty standards far road and sewer canstuctacm and 5pokane County guidelines for sfarmwater ntanagement All desagn deviatiQns have be,en - approved by the Spokane Cvunty Engineer. I apgrQUe #hese pIars for construction TABLE OF CONTENTS 1. Dramage Suanmary U. * Typica1 CLirb Iniet and Driveway Cufi Calculativras . (additional calcuiatians with Basrns) * Storrnwater Drainage Calculations for Midilvme East 3rd Additian: Basins A tluougli L. " T[I. Attachrnents: ~ . * Roatiway Surfacing I?esign * Sails Map and Tables ~ * 1'v1idiIvme East Ist Add., Drainage rnap and calculatians ti * Mic3ilame East 2nd Add.; Drainage map and calcula~ivns ggG7 ~ s P1Proj ectsl1g83811283&-ZOSda; ' ~EXPERES _ I~`~►'~ ~ ~i ~ E j _ SY,nrmwater Z3t`ainage RepQrt .11tidilarrie East 3rd Addition ~ I]RAINAGE SUNINARY: - This project is located sauth af 32nd Avenue and east af Pines Road The plat prc+pQSes 37 residential aots totaTing approximately 17 acres - The deveiopttzent is divicied irita twelve (12) basins; A through LSee Drainage Map for NNEdilvme East 3rd Aciditivn. Each basin is compased of two subareas, 1} grass lawns arid svva.les, and 2) irnperuious roofs, - driveways, and asphalt paved streets Storinvvater flovvs overland across raofs, grass Iawns, a.nd driveways arrad in#a grass surales beMnd the street curbs Storrmwater ftom asphalt streets flvws along t.he curb gutters and into the grass swales tfaraugh driveway curb cuts and curb apenings located at low poincs in the curb prafile. As specified in the "Guidelines for Starznwafier IWlanagetnent", gage 5-4; where a sloging swate is less than ]GO ~ feet 1flng, and slapes ar 1ess, the swale ma.y be considered flat I3riveways along the road wiil obstruct the swales, creating a series of individual swales that are less than ] OU feet long and Iess than 1 4%, and 6 inches , deep between the driveways. Therefore, each swale wilI be consitlered as flat. Storinwater will fi1l each swale to - a6 vnch depth and then vverflow acrtass each drivevvay until the water reaches the finat swale and dryvveid(s) f. . The grass swales were calcuiated to hold the first 112" of rainfaIl runoff aver the asphalt street areas - Figure 2, page 6-3, af the "+Guidelines fQr S#onmwater Management", by Spokane County Engineers, was used ' for rainfall intensity and duration occumng at a 10-year starm frequency. The Rational and Bawstring 1Vlethvds were used to calculate the peak stormwater runvff for each basin, and the i type and number of drywells needed for each basin based an the starage capacity of the swale ~ In accordance with °Sod Survey, Spokane County, Washingtan", 1968, the svils at ttae site axe categorized as. GmB, Garrisan Very gravelly leaam,... simiPar to Garrisan gravelty Ivatn, except that the surEar.e layer is very gravelly SxB, Sgringdale gravelty sandy ivam, deep,, similar to SpringdaIe gravelty loam, except that the depth ta gravel and coazse sand is more fi.han 36 inches. These t}pes of soil are considered acceptable for drywell installatican per Section 4-4.1 of "Guidelines for 5tormwater Management„ - Starmwater Drrainage Report Midilome East 3rd Additivn CURB INLE7 AND DRiVEWA~ CUT CALGLLATIONS 1} For each basin, calculations have been made for the curb inlet docated at a lovv point. Each curb irlet lacated at a low pvint is sized to accept the flow nf starrrzuzater from the contributing pavement subbasin ~ 2) In svme cases, additionaI curb inlets are required on continuaus grades Runv$' calculations have been - made for the pavement area in these subba.sins. 3} Tlriveway cuts on cantinuous grades vfitl intercept the stormwater flaw in each pavement subbasin prior to the curb inlet at the low poirat A typica,l calculation has been made for a driveway cut far the - pavement in subbasi-n 345, siace this subbasin has the largest pavement area of ariy subbasin in trie plat, it wil1 nave the 1argest peak flavv of any subbasin. A driueway cut of 1182 feet as required for thrs sub6asin, but is less than #he typical driveway cut of 24 feet 5ince, the runvff wi.li be less in all other pavement subhasins, driveway cuts far the other suhbasins vvill be sufficiently wide (24 #t ) to intercept the storrnwater in the corresponding subbasins Qrivevvav Oroenine on Continuous C'i~rade, Example 5ubhasin A5 i " a= fl in Flawline depression at agerzing ~ y= 4.1 ft. Depth offlvw in nortnal gutter ~ Q = 0.26 cfs I3esign discharge ~ QwLa =0 022 Fram Fig 16(a), page 6-39 "Spakane County C'ruidelines fos _Starmwater Nlanagement'= L = QI(Qa1La) = 0 2610 022 = 11.82 i3 Dmveway Qpening; 24 ft. wide, s in. deep OKAY i I RATIOhlAL FORNiUl..R HYQF:OLOGY f3RAfNAGE 8AS9N ANALYSIS iDr 10 A'ERR 57ORhA EIAENT ~ ❑ate 3121101 Project h7ame h+4iddorne East 3rd Addatian _ Qesign• kwm Pcoject Numher 12838 . nisxFne R4roleetsti1283svatronallaa1v2638nnE3jjs 5ite Lacation• N 112, 5 34, T 25 N,R 44 E W.M _ Basin ivEame 'A5' Basm Descnpbora 36th Ave and Mcponald St Poiret af Cancentratron 5ta 38+70, left ~ SLJgAREAS: Intensiiy-puratian fpr 10-year 51orm Event ❑escnpt3on Acres C A"C ' Time Time Intensity Incrmnt Incrmnt Pavement 0092 090 0083 (min ) {sec ) (in Fhr) i#3'601 500 30000 318 ~ - - 5 soa 31s 10 soo 224 `l5 9[}0 1.77 20 1200 145 - 26 1500 121 34 1806 1 04 , Tofia9 Basin Area. acres = 0.092 35 21{]0 0.91 CumpvSite Runaff Caefficient = 0900 40 2400 082 - Combined (Area ' Runoff Coefficient) = 0 083 45 2700 0.74 50 30DtJ 068 55 3300 0.~'i4 60 3600 0.61 TIME C7F CONGENTRATIQN [minutes] 55 3900 0.60 70 4200 0.58 Tc (QVerland flow) rc {gutferClaw) 75 4500 55 80 48DC} 0,53 Ct = 015 L2 = 223 85 5100 052 Zl _ 36 sa 5400 050 - LI(A) - 18 zz = 0.167 95 5700 049 ru(a,) = a 016 s= a 100 soao 048 5(A) = O.027$ n = 0A96 5 = 00135 , Tc (A) _ 021 d = 0.1 L146J = 0 Tc {guk} 2 58 N(B) ° p Te(A+B) 0.27 S(B) = a Tc tQfal 5.04 Intensity 318 PEAF( DISCHARC+E, 10 rEAR sraRM- Tc (B) = 00 Holding 7 95 Q=C`1'A= 0.26 C.F.S. Q (estimated Q tl) = 0.2$ e t.s Time af Concentration = 500 minutes A5 ~ - DEPTH C}F FLOW - y - FEET E bt 02 03 04 . 05 .06 aH .ifl 2 3 a 5 fi 7 .8 9 14 s - ~--F- T~~°°E~- i s I 4__1 ~ I I ~~I R~i ~ 1I T f P 4 - ~ 1~--i- i~- ~--~,~--1~-M rt'- ~ ~ • 3 LL;~I7i Q~ Lf - La v$ ~ti~'G ~ I i_I I 1~ 1 i I i j 9 ~ ~ .v6 I ~i ♦ ~ . ' ~ ~ .as i ~ I~e P' , I i 1 I 04 i I d ~ ~ ~ ~ '.03 oa L~ , d J~~ i l 4~ 9 ~ J t~ f ~ I ~ I I A P / t I I I I ~ 1/ I I I_I i I I A P 1 I~~! I~ 6 10 (a) DISGHARGE PER FOaT OF ! LENGTF# 0F C17R9 DPENING IPiLETS WHEN INTERCERTING .s E04°lo Lf GLlTTER FLOW o L , E (b) PaRrIaL Ir~TERcEP~rrv~u ' I~ 1 ! Qa RATE~] FO~t PNL€TS ❑F LENGTH LESS THAN L. ~ I7~ -.z ~ I ~ I I ~~~•~oop L ao I .05 .0£ ❑fi .19 .2 3 .4 S .4 .8 t.4 LILa ' CAf'ACITY DF GUR9 (7PENING INLETS oN CaNTiNuOUs GaaDE 6-39 FiGuRE 16 Circular Channel Arialysis & Design , Salved with Manning's Equation Open Channel - Unifarrn flow I Warksheet Name: Midilome East 3rd Comment: Fzpe fram Cvnc. Inlet to Drywell - Solve For Actual Depth i Given Input Data: Diameter.......... 1.00 ft ~ Sltipe 0.0200 ft/ft Manning's n....... 0.010 Discharge......... 1.00 cfs , Computed Results: Depth 0.25 ft - Velacity.......... 6.03 fps F1ow Axea 0.17 sf - CritiCa1 Depth.... 0,42 ft Critical 5lope.... 0.0034 ftlft Percent Full...... 25.41 a _ Fu11 Capacity..... 6,55 cfs QMAX @,94D 7.05 cfs Froude Number 2.45 (f1Qw is Supercritical) ~ Open Channel Flow Madule, Version 3.21 (c) 1990 Haestad methods, Inc. * 37 Braokside Rd * Waterbury, Ct 06708 ! 5tarmwater Drainage Repvrt _ 11. S7'ORMWATEIt DRAINAGE CALCL]LATIONS; ~I I Ba5if1 A ~ AI"ea - , TotaI = 145,830 sq. ft. 3 3478 acre Pavement = McDona.td St = Sta 38+45.32 ta 44+21 88 =(575,56')(18') = 10,378 sq. ft - 36 t' Ave. _Sta 9+54 3 5 to 9+97.1 9 _ (42.84')(1 S') = 771 sq. ft. (156.86')(18') = 823 sa+ ft 13,973 sq ft. - 0.3208 acre ; Sidewalks _ (576 56 + 42.84 + 128.52)(6.5) = 4,862 sq ft. - 0 1116 acre Dnveways = 6 dnVeways at (30.5')(Z4F) = 4,392 sq. ft - 0 1008 acre Rovfs = 12 rvvfs at 2,000 sq ft.lhouse 24,fl0+D sq ft. - 0.55I0 acre Impe,rvious = 13,973 + 4,$62 +4,392 + 24,000 = 47,227 sq. ft - 1.4$42 acre Grass Lawns ~ 145,834 sq. R. - 47,227 sq. ft _98,603 sq ft. - 2.2636 acre ~ Storaee Reauired a} "208" Stcarage Requireci =(13,973 sq. R. )(112" =1 2 ir►. per ft 582 cu. ft b) avwstsing = 781 cu ft+ 3 Dvuble Barrel Uryweli, Type B (3.0 cfs nut) 5toraee Provided: - Swales 786 cu. ft > 5$2 786 cu. ft. > 781 E ` I _ MIDILOME EAST 3`d ADDITIDN DRAINAGE CALCUT,ATIf]N5 _ BASIN PAVEN[ENT AREA "208" STQRAGE SWALE STC)RAGE REQUfRED AVATI_.ABL~ ~1 (-339°)(18°) _ 6,102 sq, ft. 254 cu ft. (102')(3 50 ft 2) _ 357 cu, ft , A2 (85')(1$') = 1,530 sq ft 64 cu ft. (6l°)(2.1z ft. 7) =129 cu ft. _ A3 (85')(18_) _ 1,530 sq. fL 64 cu. ft (61°)(2 ~ - - ~ ~ ~ } 129 cu ft A4 (44')(18') = 792 sq ft. 33 cu ft. (6 i')(2. 1? ft. 2) =1 29 cu ft --As (223.28')(18') = 4,019 sq. ft. 167 cu. ft (20=){2. i 2 ft. 2} _ 42 cu. ft ` Tatal 13y973 sq. ft 582 cu ft 786 cu. ft i MIaILOME EAST 3RQ AaDI TION January, 2001 FwnG6 197a Z7~tp5f17t E7t9b76Q~7'S, l3LC. Dl~O I n CI C~ e l~ CI lcuI atI Q ns iYVIL ENGENEERS & LANfl SURVEYORS N.943 ARGDNME RC3Ap SPOIfAIdF, WA 94212 PH 926-1322 TYPGCA,L SECTION: DRAINAGE SWALE AND DRiVEWAY - N (7T TO SCALE R/v~ ~ 13' 7' 18, 5 25' fi 25' 65 ' ~ zoo% 6" deep, curb cut , ' - • . 37 m'" 00 Cernent Cvncrete /Ff ~Nvrmvf swale slope Concrete Curb 5wale Bdttom 13 R/w 7 Crass-5ectivnal ,4rea v( Swvle 5 25' 6 25' ~1 ~ 6 S' ~ ~ 2 68~O zds (1/2)(0 5°)(z ss') +(i /2)(o s)(2 68') - 1 .34 sq 5 4r8s~ fl ,gs~;. 0 . ~ 067 o~~ 7 64 ~ ~ TYPICAL SECTION: QRAINAGE SWALE 2' WIDE N OT TO SCALE , ' 13, R/w ~ 7, 18, 5.25' 5 25' ~ ae + 6 5' 6„ deep, curb cut , I _ 2 04% - ~ .~3 5X mpn [a f~ ~ ~ . • , _ . I, ' Cement Concrete Normvl swale slvpe ~ Concrete Curb ❑nd SEdewalk C1rivewoy ~_Swole Bcsttorn 30' R/w 1o' Crczss-Sectionpl Area of 5wele ; 5 25 , 2' 5 25 1' S 5' ~ ~ ~ ~ (1/2)(0_5'}(2 25') + (i /2)(0 5')(2-25`) + (0 s')(z o') = 2 12 Sq ft ' z zs ~H2215 056 0.56 i aa a ~ ¢ ~ MIDILOME EAST 3Ra ADaITION Jpnuary, 2001 FoURdrd 5D4e 6impson E7tgineB7'S, I1ZC. Q r a i n age Caic u I a t ion s CIVEL ENGIHEER5 de UW D SiJRVEYGRS r ' N,9[,19 AR.~'ipNNE ROAR SFOICANE, VYA 99212 PH 925-1322 - TYPIGAL SECTI4N: DRAINAGE SWALE AND DRIVEWAY , NQT TO SCALE ~,~w r~ ~ ,3' 7' 18" ~ F ~ 6 25' fi 25' 6 5' 6" deep, curb cut 200% ' ; rrTin , I ' ~ _ ' ~ , . . • ~ r - - Cernent Cancrete IJormal swole slvpe ~ Concrete Curb • ~ 5wale Bottorru ' 13 R/W 7 ~ Crass-5ectional Areo v6 5wale ~ 6.25' i 6 25' 11'4 6 5' (1,~z)(v 5°)4z ss') + (112)(0 5")(2 6$') _ 1 34 sq. tt ~ ~ ~ . ~ 067 067 ~ yn _ .i I TYPICAL SECTIC7N: DRAINAGE SWALE 5.5 WIDE NOT Ta SCALE ' 13' ~/W ~ 7' 98° CL ~ F 3 50' f 5 5' k 3 50' 6.5` ~ ~ 1 ' S" deep, curb cut z ao% I co , , , ~ • - - , --J o,~-,l Gement Ccsncrete p55 fWormol swnle slvpe ~ Concrete Curb and Sidewaik 'briVeway 5wole Bvttvm 10' RIW t{]' Cross-5ectiorsal Area a( 5wale 3 5D ~ 5 S' 50 l1'i 65, ~ (1 /2)(0 5')(1 50') + (i /2)(0 5')(1 50) 5')(5 5') = 3 50 sq #t 4.375 0375 2 75 p ,g t ,I ' DETEPJTI(7N BASIN RESlGAE RATIE}AlAL FORNtUl.A HYqRC7LOGY & BOWSTRING NIETHCIC] ❑RAINAGE 6AS1N ANA,LY54S far 10 YEAR STORM E11EN7 ' Qate- 1124F01 Praject Name Midikome East 3rd Addittorr Job No 12838 ProJect LacaUan. N 1/2, 5 34. T 25lV , R4t IE W M - Designer K MCMlJ4KIN Dramage Basin Name- "A" Disk Dir. P Iprojectsil 2B38lkinwstnng C3rainage Basin Dewr'sptiow Qnsrie Falsname 12f3"3$ME3xis '2038° Pnndmg A,rea Name• swate For Tnmfinsan Porsdmg Hrea Loatiarr west scde of 1NcDanald St. Pamt of ConcenfraGan- tovu F't, 42+44 44, Lt - SIJBAREAS T1ME OF GONCENTRATIQN iTc1. m3nutes Descrip8on Asres C A`C C►verSand Flow Channe9 F1ow I Imoenr[ous "208" Areas SgymeritA. !.2 = 570 - ,Asphalt Pavement 0321 0.90 0.289 Ct = D 7 S 21 = 45 5idev+aiks 0.112 0 90 0.104 L3 (A) = 1 E P2 = 45 OrrvewsYs 0101 0.90 01091 fd(A) = 01016 B= 2 Raofs 0551 0.90 0 496 S(A) = 0.02 n~ 0.03 Gras5 Lswn 2264 ai 5 0340 Te (A) = 0 23 s= 00102 Q(her Aress_ ~Lepmeirf A d = 0.959 L4(B) = 0 Fe [ch y 4.24 fl!(B) = 0 7c(A+6) = 0.23 S(s) = 0 Tc tolai 5,00 = #r~nsfty = 318 1`afal Bssm Area. acess ~ 3.34E~ 7c [g] UA Cornpasate 3dunoif CoeifitEent = 0 39 , Gomhirsed (Area ' Runot# C,oefficient) ° 1 315 ❑(esfamated @ d) = 4.48 c.f.s Tirrts af Cencertratian = 500 minutes '208" pRAIhiAAGE PARAMETERS _ "208" Pavemerst Area ~ 13973 sq- ft PEAF( D1SCF1ARGE, 10 YFJIR 5TORM '208" Voluma Prnvided = 786 eu. ft, at 6" depth _ Stnrm Storage Ptovided = 786 cu R. at 8" depth Q= C*I' A= 418 C.F.S. _ 6OYV8'CRING CALCLJiJ1TION5 ~t #"t 93 04 ~5 s6 #l N1JMBER and "dYRE af []RYWEI.LS PRC]Rf75EA Time Tme Irotcnsity p dev, V irr V ouf 5'iorage - _ Irscrmnt Incrmnt. 0 Singfe-Barrel (&pokane Couniy Type A) [mtn) {sec.) {in.lhO (ds) (cu ft.) [cu R.) {cu ft) 3 f]nuble43arral [Spoirar►e Counky 7ype E]} X'1`64 fA'C"#3} (ouff'92) {#5-#83 _ ~ 3-9'B a~$ i7 s~T6'~b rtTf C]aatHow Provldec#. 3 0 s. ' b 3150 3 3B 4-18 I'W3 90b 7$T i 10 600 2.24 2 95 2068 18p0 268 15 SDD 1.77 233 2333 2700 -3E7 20 1208 145 191 2483 360D -1117 25 ism 1.21 1 55 2550 45d -7954 °208" TFsEATMENT Vt7Ll1ME , i 3(} 1800 1G4 137 2E02 5400 -2798 ~ 35 21013 091 1.2[] 2636 5300 -36fi4 Required G P.A. pondmg vQlame 40 299d 0.82 7.08 2659 720D 4501 Impemvus '2fl8' Area x tl2° = 582 cu R. 45 2700 474 097 2727 8100 -5373 Valume provided at 6' depth = 786 cu Ft , 50 3000 0.68 089 2774 9DOO -6225 EyKa 55 3300 0.64 0 84 2864 m -7Q34'i . 60 3600 D.59 0 80 2970 1m -7830 - 55 3SO0 060 0 79 3158 11700 -&r42 " 70 4200 058 0 76 3281 9260D -9318 75 45M 056 074 3390 13500 =10110 S7c3RM STOF?qGE VC7LtiME 80 4MO 053 470 3417 14400 -109a3 as $goa 052 0 6B 35M 15300 -1 1742 Maximum stvrage required = 781 cu ft. 90 5404 050 0 66 3618 16200 -925$2 valume pravided at depth ~ 786 cu R_ 95 5700 0.49 064 3739 47100 -13361 OKI 1DCS 60M 0 48 0 63 3853 18D60 -14147 i Simpsvn Eh9fneers; [nc. 909 NorlhArgonne Road, Spolsa►Ee WR 99292 (50) 926-1322 '-I , lmrl~~ . ' Storrnwater Drainage Repvrt i II STqR,MWATEA DRATNAGE CALCULATIC]NS: ~ Sub-Basin Al ~ , Cur'b Ovening at Law P~int_ Sta. 42+44.44, Ieft, McDanald Street h= 8 in. = C).67 ft Total height of vpening H= 4 133 ft Depth af water at enfrance Q_[].40 cfs 7atal peak rate of flow Q = 3 0$7(L)(H)312 fOF Hltl C 1, ~ 133I0.67 = D. 19$5 C I , L = Q - (3,087)(H)312 = 0.46 - (3 087)(0 133)~2 ~7- 2 67 ft - Construct Curh Opening, 3 ft. wide, 8 in deep i ~ RATIONAL FORMULFl HYDROLO{',Y DRA,IEVAGE BASfN RNALYSIS far 10 YEAR a1`CJRM EVEN7 _ Dale 1124101 Project Nams' Nlidilome East 3rd AddtUon DesiAn kwm ProjeeY Number 12838 DiskFiie RVprqect51528381ra4QnaR16t12838ME3)ds 5te Lacation: N 112, S34, T 25 N, R44 E W M. , I Sssin Name "A1" Basin Descript3an Mc[]anald Street ~ i Pomt af ConGentration 5ta 42+44 44, ieft I ; SCEBARE45 Irtferssi}y-Durativn far 7C1-year Storm Event Qeseripfion Acres C A`C Tirae Time lntensity Incrmnt Incrmnt ' I Pauemen4 0140 090 0126 (min } {see } (in lhr) ~ai•so~ 800 30000 318 - 5 300 318 10 600 224 15 90D 'i TT 20 32f]D 145 25 1500 1.21 341 1800 104 Tatal 6asin Area, acres = 0140 35 2100 0.91 Compasite Runoff Coefricient w 0900 40 2400 ❑ g2 carnb~ned (Area ' Runoff coefficienc) = 0126 45 2700 074 50 3000 0.68 ' 55 3300 0,64 60 3fiC10 061 TIME 4F CC3NCEhITRATIaN (minutes) E5 39[)0 0_60 ! 70 420(] 058 Tc (auertand /fow) Fc (gu[terilvw) 75 4500 056 St] 4804 053 , Ct = ❑ 15 L2 = 177 85 5160 052 ' Z1 = 36 90 5400 0 50 L1 (A) _ 18 7-2 = 0.167 95 570[] 049 N(A) = 0016 B= 0 101) 6DOO ❑ 4B S(A) = 00278 n = 0016 s = 0007 Tc (A) = 0.21 d= 0133 L9 (B) = Q Tc (gut ) 2 35 N(B) = 0 Tc(A+f3) 021 S(8) = il Tc total 500 Intensgy = 318 PEAK DE5CHAi2GE, 10 YEAR 5TL3RM: 7c {P} = 00 Fiolding 631 ' A=C' 9°` A= 0.44 G.F. a. 0 (estimated @ d) = 040 c f a Time crf Cvncentratian = 500 minutes - - At , Stormwater Drainage Repvrt _ fI. STORMWATER-IJRAIlNAGE CALCULATIONS: -Basin B ~ Area Total = 49,000 sg, ft- 1 1249 acre Pavement = McI7ona'Id St = Sta. 42+01 4f} to 44+2 1.88 = (22 V)( ] 8') = 3,978 sq ft. 35h Ave = SEa. 0+ 1$ to I+50 =(132')(18') ~ 2,376 sq, ft. ; fi11et = (20)(20) - (If4)(7c)(20)2 = 86 s4. ft. - 6,440 sq. ft. 0 1478 acre Sidewalks= (179' + 3 V+ 11 2')(6 5') ~ 2,096 sq ft. - 0.04$1 acre Driveways =2 driveways at (30 5')(24') = 1,464 sq ft --a 0.0336 acre ' Rvvfs ~ Z roafs at 2,(]00 sq, ft.Ihause = 4,000 sq. ft- 0,0918 acre , TmperviQUs = 6,440 + 2,096 + 1,464 + 4,000 _ 14,000 sq ft. - 0.3214 acre ~'rrass Lawais = 49,000 sq ft. -14,Dtl[l sg =~5,000 sq ft~- 0.8035 acre ! 5toralae Required a) "208" Starage Requered = (6,440 sq+ ft. )(112"= 12 in. per ft } = 258 cu. ft. b) Bvwstring -224 cu. ft. +I Doub1e Barrel UryweIl, Type B (10 cfs aut) SEaraee Provided: - Swales: 354 cu. ft. > 268 354 cu. ft. > 224 , I E I , Mff]IIdDME EAST 3`d A.DDITiQN ~ nRAINAGE cALcuLATIaNs BASZN FAVEMENT AREA ' 64208" STt]RAGE SVVALE STC]RAGE AEClLTLRED AVATLABLE , ai (20+150)(18') _ 3,060 131 Cu ft (100')(2.12 ft 2) =212cu ft (20)(20) - (1/4)(7c)(2())2 = 86 )j46 ; B2 (106°)(18°) ~ 1,908 sq ft 79 cu. ft (86')(1 34 ft.2) = 115 cu ft. B3 {77°}(18°) = 1,386 sq ft ss cu. ft. (20')(1 34 ft x} = 27 Cu. ft _ Total 6,440 sq. ft 268 cu. ft. 354 cu. ft. , ~(]Qi MIaILDME EAST 3RD ADaITlDN January FauH06 14K i 6& T,7tZV5iln *nBErS, I'I'LCC. DI' CJ I fl Qg~.' CC] lC LI lCf tI of15 cIwL ENGIrtEERs &LAraD suRVEYoRs hi 909 QRGONfJE ROA❑ SPOKANE, WA 99M PH 926-132? I TYPlCaL SECTION: DRAfNAGE SINALE AND DRI1JEWAY - N OT 7a SCALE i R/W 7 - ~ 6 25' fi 25' 6. 5' E" deep, curb cut _ 2 OQro rr3in _ ~ . . - • ~ ~ Cement Cpncre#e~ ~t/F1 p^~sbl Normol swale siope ~ Cor~crete Curb 5wnle Batfbm ' i , 1~ R'~ 7! , CroSS-Sectional Area af 'Swale - ~ 6 25' r f 25' 1 6 5' R ...~I~ - 1 (1/2)t0 5'1f2 68'7 + (1/2)(0 5')(2.58') = 1.34 $q rt 067 067 . •s ,~a ~ , TYPICAL SECTION: DRAINAGE SWALE 2' WIDE NQT TQ SGALE ' ~ R/W 7' ~ 5 2S* 5 25° ~~o~ - I 6" deep, cwrb cut mm is0 J 0 ~ ~ ~lormal swale slope A \-Concrete Cement Conerete Curb and 5idewnik Driv2wpy \-Swole BDtiom i i - ia' R/'" 10' Cross-SeEtiongl Area ofi Sv,afe - I5 25 2° ~5 zs 6 s 1 (1l2)(0 5'){2.z~'} + (112)[0 5')(2 zs') + (0 5')(2 o') = 2 12 5a. ;t ~ I 2 22s 2s ~ + ' •~T~..~ 056 0.56 t C1C7 p2 J MIDlLOME EAST 3RD ADaITION J°n"°r y, ~ 6s Fwn600 99~9 I - ' f irrcpsot. Ergineers, Inc. ~ Dr aincge CQ I cuf C] t ionS CIV1L ENGlNEERS & LANp SURVEy+JRS I H.909 ARGDfdNE RQAp SP41CANE, WA 81212 PH 926-1322 I ' TYPICAL SECTIQN: DRAMGE SWALE AND DR111EWAY NoT To scALE R,"' - 13' ~ 1$' fi 25' 0 25" 65 ' /-6" deep, curb eut _ 200% ~ _ - ~ • rnin Cennenf Concrete I~'~ ~Norrnal swole slapQ L Concrete Curb Swale 8ottom ; I 13' R/W 7' Cross--5ectionai Areo of 5wale ~ 6 25' r 5 25' 5 5' ~ (1 /2)(0 5')(2.68') + (1 ~2){0.5°}(2 ss') - 1.34 Sq ft ~ . 067 ' S 0. 67 TYPICAL SECTPON: aRAINAGE SWALE 5.5 WIDE ~ NQT TC] SCALE - 13' R_, _ 7' 18' ~ _ 350'IM-1- 55, 0-1~ 3 SQ'~ 6.5' 6" deeP, curb cut z oa% n 00 ~ Cemen t Con crete a~ p• Normal swale slape ~ Concrete Curb and Sidewalk ❑rfuewcy Swoie $ottorn • 14' RI'" 10' Cross-5eckioe~ol AreQ of 5wa1e 350 i 55' i 354~1'i 65' ~ ; ~ T r (1 I2)(0 5') (y 50') (112) (0 5')(1 50') + (Q s)(5 5') _ 3 50 sq ft - - ~,~~3 5 ~J 375 0 375 2 75 ~ Q .5 I , DE'fENTION BASIfV pESIGAS RATI[]NAL FQRMi1LA HYDROLC7GY 6 BflWSTRING METHbD QRl41AlAGE 8A51N ANALYSIS far 10 YEpR 53C]RM EVENT i pate 1I24101 Project Name M3diEame East 3rd Adddivn ,lcsa N0 12838 Proiect Locadvn N 112, 5 34,; 25 AE , R 44 E W 4V1 . Dessgner K. MCMl3LKIN arainage $asin Name "B" disk Die P lproject0 2838tbovestring Drauage Qasin f7escnpbon CJnsrfe ' Ftlenarrte 12$3$1UIE3xls "208" Fanding Wea Name swale For T4mslinsvn Pandmg Area Locaban east srde af Mcpprtald St Point af Ceneentratian, Law PG, 42+43 44, Rt SUBARF-AS _ 7dME dF CONCEN1"RATI[3N Cfcl, m3nubes Descripbon Aeres C A'C Overtand Flayv Channel Flaw lmoerwrous "208"Amas• 5eumerrt A: L2 = 177 Asphal# Paugmerrt 0148 090 0133 Ct ~ 0.15 Z1 - 45 5idevvalics 0.648 090 0043 L1(A) = Q 7-2 = 45 Orroe+rv-ays 4 034 a9C1 0430 N(A) = 04 B= 2 Raofs O.092 090 0.083 S(A) = 0_01 n= 0.03 ; Grass La'nm 08[u1 0.15 0121 Tc (A) = 000 s~ 9.607 - 0117erRmes. S{e merrt8 d 02$1 L1(B) = 6 Tc {ch } 2 08 - N{6} = p }"c{A+$} = 0_04 ' SO) ° p 7c total 5 00 = Tofal Bas:n Area, acres = 1 125 Tc (£3) 0.0 Irtensity = 318 Composife fturcoffCoeffczern= 036 _ Comhined (Area ° Runoft Coefficient) ~ 0.416 G! (esbmated (c# d) = 1 30 04 Time of Concenfrahon ~ 5 00 mznutes "208" [JRAIN4GE PAFZA4IAETERS _ °208" PavasteentArea - 6440 sq R PEA1t DISCHARGE. 70 Y~r4R STOFtAA °208° Volurne Pravidsd = 354 cu ft at 6° depth - i 5tnrm Stnrage preavided = 354 eu !t at depth Q= C"I° A= 130 C.F.S. SOWSTRING CAtCLJk,ATdC3N5 9;2 $3 44 #5 iFb #1 TfldMBER and 7YPE af DR'NUELLS PROPC]SED Time Time intansity Q dev. V in V out Starage Incrmnf Inermnt. 0 Sinale-Sarrel (5pekane County Type A) (min ) ~ ~ {m.l#Er) ~{efs}~ (eu ft) [tu ft] {cu ft} 1 QQU69e-8arrel (S~ktane Gourity Type (vutf '#2) [95-#6~y h bo ~4 y~O ~T CWlaw Prarndesl 1C.f s ; 5 3w 3 its 1 3u 9T4 3m 222r , 10 &oo 2.24 0.92 Sa4 sou 44 - 15 9Da 1 77 0.73 727 9DI] -173 20 1200 7.45 0 59 773 1200 -427 _ 25 1500 121 0.50 794 15[T!] -706 °2t18° TREATNIENT VOLUME ' 30 1800 104 0.43 81❑ i80D •990 35 2100 091 0 37 821 2100 -1279 Required G PA pondmg nolume 4❑ 2400 0 82 034 841 2400 -1559 ImPernaus "208" Area x iP2° - 268 cu R 45 2700 ❑ 74 0 30 849 2700 -1851 valume prvVided at 6° deAth3 354 cu ft 50 3CX1U 068 0 28 864 3000 -2135 ,pK! 55 33f3D 064 0.25 892 3300 -2408 , 60 9500 061 0.25 925 36M -2675 ' 65 3900 060 0.25 984 3900 -2916 70 42D3 058 624 1422 4200 -3178 75 4540 0ss 0.23 1056 4500 -3444 STC]RN! &70RAGE VaLiJME , 8Q 48M 0 53 0.22 1064 4800 -3736 85 5100 052 0.21 13178 5100 -3992 Mawmum stvrage required = 224 cia R ; 80 5404 050 020 1127 5400 -4273 va[ume providad a# S° depm = 354 eu R 95 5700 6 49 020 1165 5700 •4535 pKI 100 6[300 0 48 020 1200 sow 48aC1 Sfmpson Engitreers, lnc 90 Afanb A►gapne f2uad, Spakane, 1M1"c4 93217 (509) 926•1322 I - i ,a¢~s n a 5tormwater Drainage Tteport TI. STORMWATER DR.ATNAGE CALCULATIONS- (continued) Suh-Basin BZ Curb Onenina at Low Point_ Sta. 42+44 44, right, McT3onald Street h= S irr = 0.67 ft. Total height of apening , ' H=[3. 086 ft Depth nf vvater at entrance Q _0 13 cfs Total peak rate Df flow ' [l = 3087(L)(14)31 for HJh < 0 0861[] 67 = a 1284 < 1 L = Q - (3 087)(H)"2 = 0 13 - (3 087)(0 485)302_ 1 67 ft Construct Crarb C)peaung; 3 ft. wide, 8 in tieep , Suh-Basin BI Curb Doenine on Continuous Grade, Sta 1+40, left, 35t' Auenue 'a= 2 in. = 0 17ft. Flowline depression at flpening y=0.a99 ft Depth of flaw in narmal gutter ~ Q= 0.21 cfs Design discharge i QalLa = 0 066 From Fig 15(a), page 6-39 "Spokane County Guidelin~s far Starrnwater Management" L = Q/(QarLa) _ 0.21/4. 066 = 3.18 ft. Construct Curb +Qpening, 4ft wide, 8 in deep • RATICENAL FDRNEULA HYpROLG+CY ❑RAIh$AGg BR3lA! ANALY5IS far 10 YEAit STDRM EIIEMT 08te- 4111l00 Project Name. Middorrse East 3rd Rddttran Desogn kvum Prvject Number. 12838 o,sk Fiia P Iprajectsl12898Sr*pisa114p112838ME3xls Sde Location N 112, S 34, T25 N. R 44 E Vlf M , Basin Idame "s2" 8asan Qescnphon MeDongld Stteet Pani af Cancentration Sta 42+44 44, nghf , SUBAREAS IMensOv-puration far 9avear Starm Ev+ L7escnption Acres C A`C - Tima Tirre Entensiiy 4nermn# Inctmrrt - PaVemenc 0044 0.90 ❑ cy39 , (min ) {sec ) (trr Itsr) [m `W 500 3o.0a 318 5 3[?Q 318 i 10 S[m 224 15 9DO 177 20 12GO 145 25 1500 7 29 34 9 soQ 1 04 Tatal 8asin Rrea, aeres = ❑ Q44 35 2100 0 91 Compxssite Rurroff Coefficieryt = 0900 4[) 2400 0 82 Carnhined (Rrea " Runai€ Ccefftr.iertt) = 0.039 45 2700 0 74 5p 3000 o.se ; 55 3300 ❑ sa sa 3600 0.si TIME OF CONCENTRA7fC3N {minukes3 65 390f} 0 5(} 70 42fkO 058 Ta (averianr! flow) Tc (gutfsr flow) 75 4500 0.56 8o 4800 0.53 Ct = 0.15 L2 = 177 85 5100 0.52 - ZI = 36 90 5400 050 L'i (A) = 18 7.2 = 0167 95 5700 049 - N(A) _ iD.015 B= 0 100 6000 048 S(A) = 00278 n = ❑ 01fi - - s = 0007 Fc (R) = 021 d= 08fi L1 [B] = 0 Tc (gut } 315 ; N(8) = D Tc{A+8} 429 S(B) = fl Tc total 5.00 - tMesasrty = 118 REAK DISCHAfEGE, 70 YEAR STBRM: Fe (E3)= 0.0 Fioiding 631 ' Q=C"I*A= 0.13 C.F.S. Q(estirttated @ d) = a.13 c f s Time af Conoentration = 500 mtn;,ktes t ; _ ea RATiONAL FQRMUTA HYDRQLQC,Y ' C1RA1NAGE BA511V ANAI.YSIS ivr 40 YE14R STORM E1FEN7 ❑8ie 4114100 Project Name Midi#ame East 3rd Addihan - Design' kwm Prvject Numter 12838 ' oisc File P 1pm'ect!.A128381ratwnaill[3112838ME3:fs 5de Lmcatiorr N 1/2, S 34, T 25 N„ R 44 E. VII M BasFn Name. °61" 6asrn Descnptivst 35th AVenue - F'oind of Concentration• Sta 1+40 SUBAREAS - Intensitv-[3uratian for 10.year 5torm Event Rescripbon Acres C A•c - 7ime T'ime intensrty IncFmnt Incrrnnt. Pavemen# 0072 020 0065 (min ) tsml [)n.rFsr} ~•sa} 500 300.00 3 38 5 30C7 3.18 10 SoC7 2.24 i I 15 Soo 177 20 1200 145 . 25 15Da 1.21 30 1600 104 ' Toft1 Basin Area, aares ~ 0072 35 2100 091 ' Gompnsife i2unoff Cveffident = 0 900 40 24DO 0.82 Comhined (Area ` Runoff Cicient) = 0065 45 27M 0.74 50 3CriW 0 58 55 3300 064 60 3600 (].61 TfME OF CONCENTRATION [rninutes] 55 3900 060 70 42W 058 Tc, (ovedarrditow) Tc (gufterflow) 75 450(] 056 8{3 4800 53 Cf = 0.15 L2 = 143 85 510[3 052 ~ Z9 = 36 90 5400 050 L1 (A) = 18 Z2 = 0.167 95 5700 0,49 N(A) = 0016 B= 0 tOD 60DO 0.48 5(A) = 00278 n = 0016 ; s = 00097 TC (A) _ 0.21 d = 0 099 L1(B) w 0 7c {gut } 1 97 Np = D Tc(A+B) 021 S(8) = p Te tatal 500 irrtensity = 3.18 PEAFt DISCH{IRGE, 10 YfAR S'fORM: Tc (B) = 0,4 Hs,lding 5 09 0=C" I*RL = U.7'.I ~'r.F. '^J. 'I Q(estimated @ d) = 021 cf5 7;me aT Goneentratian = 500 minutes - - ar va41019 gEPTH OF FLOW - y - FEET t i.oi Q oi vx 03 04 .as os as .~o z ~ a s.s 7.e s ! ; I ~ s ~ ~ ~ ~ XV/ --T' T-t 77 -T- 1 • .n f ~,7; a ~'41 1-a 1~ ~~°~~~f I f ~ ap~► E , ~ o• , oe 06 -}~-L as , -i ~ ' -T- 04 ~ f ! i~ f I I 1 ~ I ~ i E I .oz ~ I~ it Sfl i y I I ! ~ , 1 f (a~ D]SCHARGE PER F'OQT flF i LENGTH OF GURS OPENlNG ---t-~s- _~o -~-r lNLE7S WkEN ENTERCEPTING ~ ,4 - I00°Io OF GU7TEFt FLOW I Q (b) PART'aAL 1NTERCEPTiON I~~ ' ~0 ' RATIO FflR 1 N LETS OF , ~ o~ I ~ I k I I LEAiGTF1 l.ESS THAN La . i : ~ fr`" • ~-~1-- -I----~---~---.z j ~ f ~~~~`I F _ ~L._ E ~ _ ~ - el- 0 oo, I . ~ ,..-L..I .10 .99 .06 .09 l0 .2 .3 4 S •8 8 1.0 Lka S~~ 4S^l ~ I CAPACITY UF GURB QPENlNG 1FVLETS DN CONTINUQUS GRADE ~ 6_39 FIGl1RE Ifi ~ Stoi-mwater Drainage Report TI STORNWATER DRAINA+GE CALCLTLATIQNS . - Ba.sire C ?►rea TataI = 45,874 sq ft. - 10531 acre , - pavement = 35'~ Ave = Sta. fl+]S ta 1+50 =(132')(1$') = 2,375 sq ft, fillet = (20)(20) - (114)(7r)(20}2 - 85 sq. ft. _ McDonald St = Sta 38+45 32 ta 42+01 40 =(35G')(18') = 6,409 sq. $ 36'h Ave. = Sta. 9+54.35 to 9+97 19 =(42 84')(18°) = 771 sq+ ft. (156 96')(18') = 2.823 scf ft 12,465 sq ft. 0 2862 acre Sidewalks= (112 + 314' + 318.19' +42 94 +156.SG)(5,S') _4,298 sq+ ft - 0.0987 acre I)riveways= 8 driveways at (30.5')(24') = 5,856 sq. ft. - 0.1344 acre ° Raofs = 0 rvafs at 2,000 sq ft.lhause = 0 sq, ft. Tmpervioras = 12,465 + 5,$56 f 4,298 =22,619 sq ft - 0.5193 acre Crrass Lawns = 45,$74 sq. ft. -22,619 sq. ft, _23,255 sq ft - 0.5339 acre ~ Stora!ae lteauired. - - a} "208" 5torage Required =(12,465 sy. ft. )(1J2"= 12 in+ per ft) = 519 cu+ ft. ' b) Bowstring = 400 cu. ft + 1 avuble Barrel i3rywe11, Type B(1. a cfs aut) Storaee Prouided: , Swaies• 530 cu. ft> 519 530 cu. ft. > 400 I ,i N.QDILOME EAST 3'd ADDITION DRAIlNAGE +CEILGULATI0NS BASIN PAVEMENT AREA "208" STORAGE SVN.A,LE STflRAGE REQUTRED AVAILABLE ci (64+150)(18°) = 3,852 164 cu ft. (100°)(2.12 ft.2} _ 212 cu ft ' (20)(24) - (114)(7c)(20)y = 85 3,935 ' C2 (80'){18y} = 1,440 sq. ft, 60 cu ft (6$')(134 ft = 91 cu. ft c3 ($n')(x8s) = 1,440 sq. ft, 60 cu ft (56')~1~4 ft = 75 cu. ft. c4 (80')(18') = 1,440 sq ft. 60 cu ft (56')(1.34 ft. 75 cu ft, C5 (39')(18') = 702 sq. ft. 29 cu ft, (56')(134 ft 2) = 75 cu. ft C6 {5129'}(18) = 941 sq. ft 39 cu ft (15'){I 34 ft 2} = 20 cu. ft. C7 (52.29')(18°) _ 941 sq. ft 319 cu. ft = o cu. & Cg (5 7.29')(18°) _ 1,031 sq ft 43 cu ft = o cu. ft C9 (32.84' )(18') = 592 sq. ft. 25 cu. ft. = 0 cu. ft, ' Total 12,465 sq. ft, 519 cu, ft 530 cu. ft. I i - MIDILOME ~AST 3RQ AaD~TIa~ ~~n~~~~', E Fwmdsd 1Qi8 ` imps~. Eng'znesrs, I~,c. D ra ~ n~ g~ ~ Q~ C~! ~ G~ I Q P~ S CIVIL EWG]NEERS &!_RND St]RV~Y~RS t~.s~s ARCaMr~E F~~ab ~~HAN~, WA 95212 PM 928--5322 , ~YP1~A~ SECTl~N: DRAIf~~~E S1~ALE A~ID QR~11EV~'AY NQT T~ S~A~E i- _ ~~W I~r ~ 6~s' ~ ss' L _ ~ - ~ 1 I ,~~6,~ deep, cur1~ cut 2 Y7~~ _ ; .~,3 59 rr~~n ~ r . ' . I~ ~ r - , U ~~~7 ~ F`~ ~ Gement ~Cvncrete-" '~~f~~ 9~~~~ ~Normal swale slope Cor~erete Curb 5wale Bottom i i~ R~ 3 Crass-S~ctionvl Area ot SwaEe ~ 5 25' 6~5 I1'+ 5 S' ~ ' ~ s~~ z 68 ~ ~~I~~~~ ~'7(~ s$~} (~!~)fo.s'3~z.s~') _ ~.3~ ~q ft - - ~ 4]85,~ Q t&~-~1_..... ` ~ ~ L~ 67 ~ 5 ~ TYPICAL SECTI~N: DRAIN~4GE ~1~VAL~ WI~E ~ N a~ sca~~ , , a° ~ - 5 25' 1' 1' 5 25' ~f t, ~ ~ 5' ~ ~ I 2 a6~ -I fi" deep, cunc ~ut . 4 ` m~r~ u~ ~ ~ ~ ~~~I . • • . i ` . ~ i ~ `ss ~ ~ Gement Conerete ~ ~2 ~ Cl ~ ~ Nprmpl swole slope ~ Go~~rQte Cur~ ❑nd 5~dewvllc Qri~eway 5wale Botfiarn ' 10' R~~` 10' Cross-5ectionol Rre4 ❑f Swale ~ z~ ~ z°~ s'z~ ~j'~ s~~ I {i~2~~a z~'l +~~~z}~~ s')~~ z~') ~°)[z ❑'7 = 2~~ sq ft ~ ~ ~ - Q~ 2 2s z zs-~~ D Sfi 0 55 1 0❑ 4S2ja Q~~~~._ , s MIaILOME EAST 3RD ADDITlON January, Feuntletl 9946 (~`p & '~77IZ~?5D'Tb L' ~71g't7eC'T'S, I7tc. Dro'inQ ge t.+'j I c~..~[ Q tions CIV1L. ENGiNEERS & LAhtp SURYEYQRS N 909 Ai2GC1NNE ROAO SPOKANE Wk 89232 PH 926-1373 TYPICAL SECTIaN: DRAINAGE SWALE AND DRIVEWAY NOT TQ SCaLE R~~ 7' ~ F 25° 15 25' I 6 5' 16" deep, curb cuf ~ 200% rn in Cement Concrete-/ /c- a 1a61 ~-Norrrial swole slape Cflncrete Curb Swale Battorn . 13, R/w 7, 625` , 6 25' E1', , 5' 1 Crass-5e[tiona] Are❑ of 5wole - ~ I _ - E I ~ (1 /2)t0 5'3(2 ss') + {1 /7}(0 s')(z 68') = 1.34 sq fit , sa z sa ..w............ 67 ~a~-~; 087 TYPICAL SEGTION: DRAIfJAGE SWALE 5_5 WfDE ; NOT TO SCALE ~ 13' R/W 7' 183 ~ CL 3 50'~l-dW 5 5' ~1--w 3 50'~ 6 5° 5" deep, curb eut 2 00% ~ 3.5~ nrn co ~ . - - . I , Cement Cancrete Nnrmal swole slope ~ Concreta Curb and Sidewolk. Clr[vewoy ~-Swale Battam 34' R!'W tp' Cross-5ectionol Area o# Swale , 3501 55' { ~501 I'l 65` I (1I2)(05')(1 50') + (1I2)(05')(1 50') + (05')[55') 350 Sq rt ' s sa;;- 0375 ❑ 375 2 75 ~ I - DETEiJTItJN 6AS[fV DESfGN RATIONAL FQfitMUI.A FiYdROICJGY &BOWSTRiNG METHOb QFRPJIYAGE SASIN AfVALYSI$ for 10 YEAR 570RM EIAENT i ❑ate 1I24101 I'raject iVame Midtlame East3rd AddiUon JQb No 12838 Prolect Lflcabon N'112, S. 34, "T 25 N., R 44 E!N M Designer. K MCMULKIN Dramags 8asfin Name "C" Disk D{r P lpraject0 2$381Ysowsfnng Drainage Basin C7escnption Onsde _ Fi]ename 12838ME1xls "208" Ponding Area Name- swale For Tomltnson Pvndmg Area Locatian south side of 35th Avenue Patnt of CryneentraGon 5ta. 1+40, nght, 35th Ave SUBAREAS TIME OF GC3NCEN7'RA'fIQN {Tc}, minutes I]escr€Pbnn Acres C A'C Overland FIQw Channet Flow ; Imoervious 268"Areas_ 3eamenfA- L2 = 690 Rsphalt Pavement 0.206 0.90 0.256 Ct = 015 Zi = 54 Ssdewalks 0.099 0 9Q 0 489 Li (A) = 4 Z2 = 54 - L7riveways 0134 690 0121 N(A) = 04 8= 4 Roofs 0_Cm 090 0DO(] S(A) = 001 rs = ❑ Q3 Grass Lawn 0534 0,15 0 080 Tc (A)_ 0_00 5= 00105 - d = 0410 06'iEP ,Qre85 S@q7fAEI7t B Li(g) = ff Te [ch.] 5 59 N(B) = 0 Tc[A+B] = 0 00 S($) = 0 TC total 8 59 TC (B) Total Basin Area, aeres ~ 1 053 = 0 n Intensity = 2.~ Cvtitposifs Runoff Coefficierrt = 0 52 Comhmed (Area ' Runoff Coefficient) = 0547 0 (esbresated @d) = 1 58 c f.s Time of Conoentrativn ~ 8 53 msnutes - - "208°DRAERIAGE PAF2AMETER& "208° Pavemant fuea = 12485 sq. ft PEAK f]ISCHARGE, 10 YEAR STORM "208" Valume Prmvided Q 530 cu. ft at 6" deplh Storm Storaga Pravided g 530 cu ft, at 8° depih Q= C" I' A a 1.58 C.F 5 BOWSTRING CALCUl.ATtnNS ~9 ~f2 83 #4 ~i #6 7~! I~LJNlBER and TYPF of ~YWELLS PROPC]SEC1 Ttme Time intensny Q dev V in V aut Staraga Incrmnt incrtnnt 0 Smgle-SarreE (Spckarte Courity Type A) [min ) (sec ) tnlhr) {Cis} (cu. if.) {cu ft.) [cu. ft.) 1 f]ouhle-Barrel (SgnEsane Gaurrty Type B) _ (#1'EP) {A'C'#3} (cuif°#2) (#546) i 5 59 33M 268 rm 05 AM 42U Clumow grovided 1 c f s ' s 3uu 318 1 ra 700 300 400 14 600 224 1.23 901 600 301 15 900 1 77 0.97 1002 300 1D2 24 120D 145 079 1059 1200 -149 25 15@ 1.21 0.66 1083 S 5[ld -417 "208" TREATMEN3 VOLkJME 30 1800 1 i64 ❑ 57 1401 1800 -699 35 2100 091 050 1113 2100 -9$7 Required G P.A gonddng vokume 40 2400 4.$2 0 45 1938 24[)0 -1252 Impernaus °208' Area x 10= 539 cu ft 45 2700 0 74 041 1148 2704 -1552 yalume prornded ati B° degfh = 5m CLI ft. 50 3[30p 068 037 1167 3W0 -1833 OKI 55 3300 0 64 0 35 1203 3300 -2097 80 360Q 061 033 1247 3600 -2353 65 35D0 060 033 1325 3900 -2576 70 4200 0 58 4 32 1376 4200 -2824 75 4500 056 031 1421 4500 -3078 STORfN STOiAGE VC7LL1{18E 80 4860 0 53 029 1432 4800 -3368 85 5100 D.52 028 1490 5100 -381 0 Maximum storage raquired = 400 ou ft SD 54E30 050 0.27 1515 5400 -38$5 volume pmvaded at 8° deptts = 538 cu tt 95 5700 0 49 0.27 1565 5700 -4135 • pKI _ 100 SOOp 048 0.25 1612 6000 -4388 5rmpspn Englneers, lnc. 909 fVarfh Argrnne Rosd, 3peskane, WA 89212 (SBS) 9284322 I I e~a+am-c Stof-mvaater I7rainage Repart II STORMW_4TTlt DRAiNAGE GALCULATIQNS (cQntanued) ' Sub-Sasin C1 Curb [)r)ening on Cantinuaus Carade, Sta 1+40, right, 35"' Avenue = a= 2 in =017 ft Flawline depressian at Qpening y= 0] Da ft. I7eptha of #lous in narmal gutter ' Q=0 26 cFs Uesign discharge QalLa = 0 07 From Fig i b(a), page 6-39 "Sgokane County Guideiines for ~ Starmwater 1VTanagement" L = Qt(QafLa) _ 0.26/0.07 = 3 71 ft - Canstnuct Curb C3pening, 4 ft wide, Sin deep i . RATfON/1L FORlVIULA HYDROLDGY DRP,#NAGE BASIN ANA£Y518 fnr iQ YERR S70RM EVENT Date 1l24101 Project Name MidElgme East 3rd Rddition i Design. kwm Pro}ect Number 12M8 o+r* Ha Plnroject5k9assftationaninuza38nnES w5 Srte Locaiion N 912, 5 34, T25 N, R44 E W M ~ 9asm Name "C'1" 8asin Descnption 35th Avanue Pomt cvf Concenfrabon 5ta 1+40, right i I ~SU6ARERS Irztensrty-Duration for 1D-year Starm Everst Descripbon Aeres C A`C Time TFme Intensrtp - Incrmnt Incrmnt ' Pavemenr 0090 090 o a8t (min ) (sec.) [in Ihr) ' r~,•srn 500 300.00 318 5 340 318 10 6w 2,24 15 900 1 TI 20 12M 1.45 25 1500 1 21 ~ 30 18M 1,04 Tatal Basm Area, acres = 4090 35 2100 ❑ 91 ComPosde Runoff Coefficierrt = 0 9m 40 2400 0 82 Comimned (Area " Runoff Cioeff~cient) = 0081 45 27D0 074 5(] 300D 0 F~ ~5 3300 064 60 3600 061 , TIME OF CONCENTRATIDN (minutes) 65 390D 050 ~ 70 424I0 0 58 Tc (overlandfiow) 7c (gulfsrRaw) 75 4500 056 Sfl 48(]D 0 53 Ct ~ 015 i.2 = 205 85 5100 052 Z1 = 36 90 5400 0.54 L7(A) = 18 22 = 0157 95 5700 049 N(A) = 0016 B= 4 100 6000 048 3(A) = 0 4278 n= 0.016 I s = 00118 7c {A} = 024 d= 0103 L1(6) _ 0 Tc (gut } 2 49 N(B) = 0 Tc{A+B} 021 ~ 5(B) = 0 Tc total 500 inferrsdy - 318 flEAI{ DlSCHJ4RGE, 10 vEAR STDRNl: Tc {6} = ❑ 4 Holdmg 7,30 ' i Q= G`I* A= 0.26 C.F.S. Q(estimated @ d) = 0,26 c f s. Tirne of Cnncerstratran = 500 mmutes C3 DEPTH OF FLOW;' y- FEET - fli 02 ❑3 pa 05 OB C7B 10 2 3 4 5 .8 .7 $.9 1.0 _ ~ - tTr ; I -rT~~ ~ I a + " I~ T-l I .a ' - L j--l 11711, ~ ~ fif• i eo ~ ~ iL La _ i o '.08 ~ ~ i ; ~ I I~ i~ iti. I ~ ~ I ~ I f I I f ~ ~ ~ ' i~~ s1'I I I I i 05 .n4 , ~ - I!~ E i_~ ~ f i ~ 1 1_E C ~ I f J,f I 7 i 1 .oi j - r I I ' 1.0 ; tay DisCHaRGE PER Fovr oF LEfVGTH ClF CURB aPErylNG - -+a ~ .5 INLETS WIiEN ]NTEFtCERTING - I00°/e OF GUTfiER FLdW $ Q 4 _ `~=------0',~ V ~ ! I I i.3 ~ (b) PARTIAL lAITERCEPTION ~~1-~- L RATEO FQR IN~.ETS OF LENGTM LESS T}1AN Lfl -1~ --4- -.2 , i a i ~ 1 ~ 1 f `E1000 , j/001 i F ! ~ 1 s i ,~fl .QS .Dfi .OB .IC! .2 .3 .4 .S .6 .B 10 L~L,o ! caPACIrY oF cuRa aPENir~~ IN~ETs - 5~~-F5-as►y, Ck vra coNsINUQUS ~RAoE 6_ 3g F1 GiJRE 16 ~ Stvrmwater TJrainage Report 11. STC3RIuWATER pRAINAGE CALCULA,TIC]NS Basin D 1) Pre-Develaoment Area Total= 143,500 sq. ft. - 3 2943 acre 1} Post-Develanment A.rea Total = 71,130 sq. ft - 1.6329 acre Pav€ment = 0 sq. ft 'I Driveways = 0 driveways at 1,060 sq. R.Ihouse =0 sq ft. , 1tnofs 7-1f2 driveways at 2,000 sq ftJhQUSe =15,000 sq. ft. - 0 3444 acre ~ Imperviaus = 15,000 sq. ft- D 3444 acre ~ Gra55 LaWnS = 71,130 sq, ft- 15,000 sq. ft. = 56,130 5q. ft - 1.2$$6 aCre ' NOTE: _ The Post-I?evelopment rate ~f runoff flowirag of'Fthe site and to the east and south ant4 adjacent prvperties is less thaun the Pre-Develapment rate of runvff` Therefare, na drainage facilities are planned for Basin "D" it , ~ ~ r~ ~ ~ - 3 2 1 I `r ~ I ~ , - -7 ~ J ,n~, ~ ,o. U ~35 th A 1~. io ~ ~ i ~r~ i__ N89'45"&5'1f q 2 9 ~r~-~ ~ ~ sJsw 9 (~~j ~ ~ f 8 73a 122ta ~ i~ ~ , ~ ~ i I F~$'i I j 1 W l I ~ 1-5 jg~~ t ' • In~.~'/ - I kM\ ~ ~ _ 4~' A- Q16 5 x4 JI r I . -r------F ~ -.•-r . 70AS , ~ . _ . ~ , ~ ~ , ~ ~ ~ ~ ~ ' , ~ ~ri ~ ~ ' f g 4 ~ ; ~w @ ~ ~ g . ; , ~ , , ~ ~ ~ ~ , e~si I~``' ; oo.ea . _~:~°e`~ ~ ,i;~s~~s.\ .'~v ~ ~ ~ I ~ CT , ti ~ k L_D I```t -v ~ 7 ~ F - ~ ~ i ; RATIONAL FORMUiA HY[3FtOLaGY ❑Rf11NAGE BASlN ANALYSSS for 14 YF~1R ST9RM EVENT , Date 1124JUi Prvject Name Midilome East 3rd AddiUon i pesign kwm Project Number 12838 Ch5k File Plpropcts11283B5rationaR1O1125.38ME3 xls Sde Location N 7/2, S 34, T 25 fV , R 44 E W M ! Basm Name "D" Basm Descnptivn Post []evelopment Pssirtt of Cnncentratian Na;ae SUBAREAS lntensrtv-Duration far 10-Year Storm Event ❑escripttan Acres C A'C Time Time intensity fncrmnt, Incrmnt Grass Lawn 1.2$9 015 0.193 (min ) {s+ec.} (an IFir) . Mouse Roofs 0344 090 0310 L01•60) 6[]5 36329 2 98 - 5 300 31$ 10 [3Uf# 214 15 900 177 20 12t3O 1.45 - 25 15DD 7.23 30 18t]OF 1.134 Total Besin Area, acres = 1633 35 2100 0.91 Campasite RuhofF Caefficmnt = 0308 40 2400 0.82 Combined (Area ' Runa#F Caefficient) = 0503 45 2700 0.74 50 3000 0.66 55 3300 a sa so 3600 061 - TIME DF CQIVGENTRAT1aN (mirsutes) 65 3900 060 , 74 d2[]0 058 Ta {overland flow} Tc (gi►[ter Rosv} 75 4500 0.56 80 A8C1[3 0 53 Ct = 015 L2 = 0 85 5100 052 Z'1 = 0 90 5400 050 Ll (A} = 95 72 = 0 95 5700 049 N[A] = 05 g= n lDo s[mo 048 S(A) = 001 n = a 5 = ~ Tc ~A) = 6.{]5 d = Q L1 (B) _ 0 Tc (gut ) 0 00 . N(B) _ ❑ Tc(A+B) fi Oa ' - S(B) _ 0 7c total 605 Interasyty = 298 PEAK UISCHAR{+E, 10 YEAR $TARA11: Te (8) _ 04 Holding 000 Q=C"C*A= 1.50 C.F.S. Q(estrmated @ d) 000 c i s TEme erf Canoentration = 6(]5 mirsutes ~ I D(Past) RA7ICYNAL FORMULA HYRRQLOGY DRAIMAGE BA51N AIVALMSIS for 10 YEAFt 5TC]RM EVENT ❑ate 1134101 Project Name- Middeme East 3rd AddMon ~ Design kwm Praject Number 12838 Disk Fda P-1projeuTs112$3dlrahwsall30142838ME3xis 5rtee Location N 112, S 34, T. 25 N, R 44 E WM Basin Narne "b" Basm Descnption Pre-bevelopmgnt Posnt of Concentrafirrn None SUBt7REAS• ]ntenssty-puratian far 90-year 5torm Event [3escnphon Acres C A`C Time Trme Intensrty _ Irtormnt Incrmrt Grass field 3 294 0 25 4 824 (min ) (sec ) (sn.l#tr) W1`60l 8 45 .waU718 2 53 5 300 318 10 600 2.24 15 904 1 77 20 120[3 1.45 25 1500 1.21 30 1800 1.04 Tota! 8asin Area, acres = 3294 3,,5 2100 0 91 Composde Runoff Coeff(ciant = 0.250 40 2404 0.$2 _ Cambined (Area • Ruroff Coeffc3ant) - 9 824 45 23DO 0 74 50 3000 068 55 331)D 4.64 60 3600 0 51 TIME QF GC]NCENTRATION (minutes) E5 39DO 0.60 70 42{]0 058 Tc (overland flow) Tc {gutfQr ifow} 75 4500 456 8[} 4800 053 Gt = D'k 5 L2 85 5100 52 Z1 = 0 90 5400 0.5(] L'! (R) = 350 Z2 = p 95 5700 0.45 N(A) _ 03 B= 0 1{]0 fiClOQ 048 - S(A) = 0017 n = 0 5 F Q _ I Tc {A} = 8.45 d = L1(B) = 0 Tc (gut ) 0 00 N(B) = D Tc{A+B} 8 45 _ S(6) = a Tc tatal 845 ' Interrs3ty = 2,53 PEAK DISCFEAFtGE, 14 YEAR STORM: - Tc (8)= 00 Holdmg O.(30 Q=G* I* A= 2.08 C.F.S. Q(estiinated @ rf) = 0 00 c.f.s Tifne af Cortcentwattan = 8 45 minutes I o(pre) ' Stormwater Drainage Repor# 11 STaRMWPrTER DRAINNAGE CALGULATIONS: ~ Basin E Arrea Tata.1= 23,500 sq ft - 4.5395 acre Pavement = 3 6hAve. - Sta 7+95 84 to 9+54 3 5=(15 S' )(18' ) = 2,844 sq ft. fitlet (20)(20) (114)(n)(20)2 = 86 sq. ft ~ Wvodlawn Drive = (174')(18') = 3.400 sa ft. 6,334 sq, ft 0 1453 acre i, Sidewalks= (112' + 31.4 + 117 5)(6 S') = 1,596 sq. ft- 0.0389 acre ~ Driweways =I driveway at (30.5")(24') = 732 sq+ ft. - 0.016$ acre Raofs = 1 ravf at 2,000 sq ft fhouse = 2,40{] sq ft. - 0.0459 acre Impervivus = 6,330 + 1,696 + 732 +2,000 ~ 10,758 sq ft. - [l 2470 acre Grass Lawns = 23,500 sq. 10,758 sg. ft = 12,742 sq+ ft. 0.2925 acre - Storaee Reauired: a) "208" Sxarage Required = (6,330 sq ft )(112"-- 12 in per ft.) = 264 cu. ft+ b} gowstring =254 cu. ft. + 1 Single Barrel Drywell, Type g(D.3 cfs out) ~ - Staraee Prnvided' ~ Swales 295 cu ft a 264 295 cu ft > 250 i~ NIIDTLO1vdL EAST 33" A,DDITItJN DRA`[NAGE CALCULATIONS BAS€N PAVENENT AREA "208" STC3RAGE SWALE STQRAGE REQL]TRED AVAILABLE Ei I (158')(18') _ 2,844 I 134 cu. ft (66')(2.12 ft 2) _ 140 - ' (2Q)(aa) = 400 ' (10')(2. i 2 ftZ) = 21 ; (20)(20) - (1f4)(7e)(20)2 = 86 161 3,330 E2 (150')(20') = 3,000 sq. ft 125 cu. ft. (100)(134 ft.2) = 134 cu. ft I Tvtai 5,33D sq ft. 264 cu. ft 295 cu ft _i ~i i I DETENTfQhI EASIN C?ESIGN RAT[ONRL FQRiNlJL.A HYORpf OGY & 8QW5TRING 1VIEFHf59 - DRAINAGE 6A51N AIJALYSfa^ fcir 10 YEAR STORM E51EA3T oate 1f24I09 Frurect Name MEdilame East 3rd Addbon Jvh Ho. 12838 Rrcted Latahcn: N 112,8 34, T 25 N, R 44 E WM I I]esigner K. MCIVIULKIN Qramage 8asin Name "E" ~ Aisk Qir , P 1projects112=tnwstring Drainage Basin Descnption: ansrte _ Fitename 12$38ME3)ds '2138" Pondirsg Area Name swale Fnr: Tomlinson Ponding ,Wrea Loca(ron svuth sule of 38th Avenue Pvint of Concentra'&on Sta 8t45, nght, 3E#h Ave SLIBRREAS TIItRE DF CDIVGENTRATIOhI (7c). rnirsutes Descnptan Acres C A'C 47verland Flrsw Chennei Fliyv lmaenious "208"Aneas S2prnenfA L2 R 150 Asphalt F'avemertt 0145 ❑ 9D 0.131 Ct = 0 1$ Z1 = 45 Sidewalks 0.039 0 94 0035 Ll (A) = ❑ Z2= 4.5 Drivewrays 0.017 090 0015 N(A) = 04 B= 7 ' Raafs 0.046 090 0041 s[A~ ° 001 n= 003 Grass Lawn 0293 0.15 0.044 Tc (A) = 000 s= 0 01 d = O.205 Ofier Areas• Se¢menf B- L1 [B] = 9 1`c [ch } 1.76 N(B) = Ll Tc(A+'8) c 040 S(B) = 0 Tc tataE 5{]4 Tc (B) _ ❑ 0 lrstensity = 3.98 ToffiI $asin Area, acres = 0539 Composrte RunoH Coefficient= 049 Cnmbmed (Area ` RunaS Gtrefficien* ~ 0 266 a(astmated @ d} _ 085 c 4.5 Time oT Caracerstrahcm = 500 minutes °208° [3FtAlf+1,RGE PARAMETERS ~ °208° PaVamertt Area = 6330 sq ft PEAK DlSCHARGE, 101'EAR STORNC , "208" Volume Aravfdect = 277 Fu ft. at E" dep3h Stortn 5lorape Provided = 277 cu ft at 8° depfh Q= C" 1" A= 0.85 G.F S. - B(5W3TRING CALCULA7`4ON5 ~2 #~3 A 45 ~tn ;F? NUMBER and TYPE of oRYWELLS F'ROPOSEt] Time Time Intensd.y 0 dev V in Yout Storage Incrmrt. fncrmrrt. 1 5urgle-6arsel (Wkane Caunty Type A] (rrnn ) [sec ] (jnJhr) (rft) [eu. ft.) [eu ft] (cu ft ) 0 Dnuhie-Barrel (Spnkane Cnunty Type B) i# 1' {A"C"#'3) (outF•"#2) (#5416) ~M o.t~ :im -417DL ztu Qufflow Pravided: 0,3 c.f.s b ;iuu :i ZtS O.t* 34U 90 2gU 1 a 600 2 24 060 418 180 236 15 9m 177 q.41 472 270 202 20 1200 1.45 039 502 360 142 25 3500 1 27 ❑ 32 516 450 66 "248" TREATMENT VQLUME 30 1800 164 0.28 526 540 -14 _ 36 2100 0.91 024 533 G39 -97 Required G.PA, pondmg aalume• ' 4D 2440 0 82 022 546 720 -174 fmpervlous'208° Area x 112° = 284 cu ft 45 2700 O.74 020 552 890 -258 wWme provided at 6° depth = 277 cn, ft 541 3DO0 068 0 18 561 900 -339 QK! 55 3300 0 54 4.17 579 9m a411 , BD 360d 0.61 0.16 5171 1om -479 65 3900 ❑ fi0 016 638 1170 -531 70 4200 0.58 0.15 Sr+{ 12E4 -595 75 4500 056 015 BSfi 1356 -6E4 SFQRM STORAGE VOLUME 80 4800 653 0.14 691 1440 -749 85 5100 0 52 4.14 720 1530 -$1 ❑ Maximum starage requiteci = 25D eu {c. 90 5440 050 013 732 1520 -888 valuma pravided at 8" depth = 277 cu ft 95 57DO 049 013 756 1710 -954 pKI 100 6Dw 048 013 779 1800 -1t321 Simpson EngFr►eers, Inc. 90$ Alrerfh Argonne Road, Spokane, WA 99292 (50) 9$64322 I Stormwater IDrainage Repart Il STORMWATER DRA.INAGE CALCL)LATI+DNS. (contmued) Suh-Basin El Curb Ovenin2 at LQw Point, Sta. 8+45, right, 36"' Avenue h= 8 in. = 0 57 fr Tatal height of opening H=0 10 ft T3epth of water at entrance Q= D 22 cfs Total peak rate of flow Q = 3.087(L)(H)3'-2 for H/h<1, 010I0.67 = o 1s C 1 L = Q - (3.087)(~312 _ 0.22 (3 087){0 10}312_ 2 25 ft - Canstruck Curb [}gening, 3 ftwide, 8 in deep i ~ Sub-Basin E2 ' Curb C3nenina on +Continuous ~"rrade, Sta. 35+91, right, Wvodlawn Drive a = 2 in. _0. 17 ft. Flowline depression at opening ' y=0.09d ft Depth of flow in narmat gutter Q _ 0 24 cfs Design discharge QalLa =0.Of 5 ]Fram Fig 16(a), page 6-39 "Spokane Gabtnty Cruidelines #'vr Stomnwater Management" _ I L= QI(Qall.a) = 0.2010.065 = 3.0$ ft. ~ Canstruct Gurh Opening, 4 ft. wide, 8 in. deep i i' i; FtATIONAL FORM4JLR HYORpLC]CY ~ ❑RAiNAGE BASIN ANALY51S tvr 10 YFAR STDRNE EIIENT - ❑ate i24101 Prcject Name, AAidilome East 2nd Addifivn , i Design kwm Project Number 12838 oisk Fiie ni vacanaiR9rniz83sAs Sne Locatiara- 9V 1P2, S. 34, T. 25 N., R. 44 E.'W M Basin Name. "E'f" Basin Oesonptson 36th Avenue Point af Coneents°ahon 5ta 8-r45, 18' nght SL18PeREAS Irstensity-Dure4an far 10-year 5fivrrrs Event i Descnption Acres C A"C Time Time Iniensfty Incrmnt incrmnt PaVement 0076 090 0 G69 (min.) [sm] (in Ihr) 5.0[} 30000 318 - 5 30Ci 318 10 604 2 24 - - 15 900 177 2[} 12{10 145 25 4'S00 9 21 ' 30 9800 1.04 ~ Tctal Bamn Area, acres = 0076 35 2100 021 Camporite RunofF Goeificent = 0.900 40 2400 0.82 Combined (F1rea' Runoff Coeffictent) = 0G69 45 2700 0 74 50 3€100 068 ~ 55 3300 ❑ 64 BQ 3600 17.51 TiME C]F CONCENTRATfON (minutes) 65 3900 060 70 4200 Q.58 Tc (vverlerrd lfaw) Tc (gu€ter naw) 75 45W 056 80 48OO 0.53 , Ct = 015 i2 = 109 85 5100 0.52 i i z9 = 36 90 54DO 050 L1 (A) = 18 72= 0167 95 5700 0 49 N(A) = 0016 B= 0 104 6000 048 5{R} = ❑ 0278 n W 0016 s W O.Q'1 Tc tAJ = 021 d = 01 - L1 {B} = f? Tc (gc.€t ) 1 47 N(6) = ❑ Tc(AtB) 021 5(B) = D Tc tatal 500 lntens[ty = 318 PEAfC DISGHAFtGE, id YEJ4R STQRM: Tc (6)= 00 HoEding 388 I , Q= C * I " A = 0.22 G.F.S. 0 (estimated @ d) = 022 G.f s. Time pf GoncenYration = 5 00 minutes ~ I F, RR7IDNAL FORMUUA HYQROLrJGY , DRAiNRGF 6A5iN ANALYSIS for 10 YEAR 5TC3RM EVENT Dafe ir24101 Pra;ect Pdame Middome Easf 2nd AddftEOn Clesign: kwm PrQject Number 12838 ~ aisk Fie ni vaWanl ov2&3aA5 5ite Location N 112, 5 34, T 25 N., R 44 E W M Basin Name "'E2" Basin Qescriphan: Woodlawn I]rnre Pvint of Concentration Sta 35+91, 20` nght 5U 6Af2 EAS• Intensity-Durdtsan far 10-aear Storm F-vent Desonpfion Acres G W`C Time Time Intensity Incxmnt ircrr►tnY. Pavement 0069 0.90 0062 {mm } (sec } (inlhr) 5 0R 30000 318 5 300 318 10 6DO 2 24 , 15 900 1 Tr 24 3200 1 45 , 25 1500 1 29 ; 30 l8fl0 104 , Total Basin Area, acre.s = 0.069 35 2400 0 91 Compasife Runaff Cofficient ~ ❑ 9f70 ' 40 2400 0 82 Cambined (Area' Runof# Coeffsc'sent) = 0062 45 2700 0.74 50 3Q~ 0 fi8 55 3300 ❑ 64 60 36EK] 061 _ TIME C]F C[]NCENTRATIQN (minute.s) 65 39M 060 70 42D0 0.58 Te (avsrfand Rayv) Tc (gufterfJow) 75 450D 056 S{] 4800 4 53 Ct = 015 L2 = 150 85 5100 0.52 Z1 = 36 94 5400 0.50 , LI (A) - 20 c2 = 0167 95 5700 ❑ 49 N(A) = 0016 B= 0 100 6000 0 48 - 5(A) = 0025 n = 0016 s = 001 , Tc(A) = 423 d= 0096 - L1 (6) = 0 Tc (gut.) 2.07 PI(a) _ To(A+6) 023 - S(8) _ 0 7o total 500 lnterrsity • 3.18 PEAfC D15CHARGE, 10 YERR STOFkM: - To (B)= 4.10 Holding 534 Q C C* I"A= 0.20 C.F.S. Q(estirnated @ d) = 0.20 c f s. Time of Cvne,entration = 500 rninutes E2 DEPTM dF FLC?W -~y - FEET 01 az 03 04 .03 os .og iv .z .3 4 .5 s r 8 9 1.0 ' .9 ~ + ; 4--l -l-T- T--r o 4 +`~1 , 2 a ~ F--~--~ L a f I f F- _ .Ea ~'.00 .fls i , 9 ' ~ ~ ! I I. . . i ,03 04 .03 - I A-"j, ~ !~t i t i l,l i~ I ~ r! I 1 ~ I t I I E .01 E; ( o} DISGHARGE PER FOQT ❑F I ~ OJ, j. ` s LENGTH aF CURB ❑RENING ~--~---t--+~-wa 401 ~ -t b6l lNL'ETS WHEN INT£RCEPTING - - I00 % ClF GIJI`YER FLt7W - - - t - .a Q - (b] PARTIAL INTERCEPT1aN i.3~g RA~'IO FQR lN~.ETS [3F L J~-~~ i~•...1- LEN G T H L E 5 5 T H, 4 N L ~ ~ ~ -1--F- -~-----I--.~ "0 00 000 ' .OS .06 .OB .10 .2 .3 .4 .9 .8 .8 1.0 - - L'~La S 2- CAPACITY 0F CURB flPENlNG 1NLETS ON CONTINUOUS GRADE 6_39 FIGLlRE 16 ~ Stormvvater Drainage Report - 11. 5TC]RMWATER DRArNAGE CATT..CULATIQNs. - Basin F Area Total = 20,200 sq. ft. - 0.4537 acre Pavement =WoodIawn I]rive = Sta, 36+3 I to 39+00 =(269')(20') = 5,380 sq ft fillet - (20)(20) -(1 J4)(7c){24)2 = 86 sq. ft. 36'h Ave = Sta 8+16 $4 to 9+54.35 =(138')(18') _2.484 sp ft 7,950 sq ft 0.1825 acre Sidewa.Iks= (117.5' + 31.4' 23I')(6 S') = 2,469 sg ft- 0.0567 acre DriVeways = 2 driveways at (28 5')(24') = 1,368 sq ft. N 0.0314 acre - Ropfs = D roafs at 2,000 sq ft.lhouse = 4 sq. ft. Iangerviaus =7,95[] + 2,469 + 1,368 + p= 11,787 sq. ft w0 27[}6 acre ~'xrass La.wns = 20,204 sq ft. - 11,787 sq ft. = 8,413 sq ft. - 0 1931 acre Staraae Renuired ' --a) "208" Storage Required =(7,950 sq+ ft)(112"-12 iia, per ft331 cu, ft. - b) Bowstring = 258 cu. ft+ i Singie BarreI Drywell, Type A(0 3 cfs out) Storaee Provided ~ Swales. 332 r,u+ ft. > 331 ' 332 cu ft > 258 I~ ii NNMiLQN,EE EAST 3'd AI)DITT(]N DR.ATNAGE GALCiJLATIONS BASIN PAVEEMENT AtEA "208" STC]RAGE SWALE STORAGE FtEQUIltED AVALLABLE Fl (23 l')(20') = 4,620 sq ft. 193 cu. ft (6i')(3.50 ft,2) _ 214 cu. ft F2 (38')(20') = 760 138 cu ft (55+333)(1.34 ft. = 118 cu ft. (118')(18') = 2,124 (201)08) ~ 36 0 (20)(20) - (11'4)(7c)(20)2 _ $6 3,330 ~ , Tatal 7,450 sq ft. 331 cu ft 332 cu. ft. I ~ bETENTtON BRSIN DESEGh! RAtIONAL FOftMULA MYDRCJL4GY &BUYV5TR1hiG METHOQ ❑RAtNAGE BRSI{V ANALYSIS far 10 YEAR 3T€}RM EVF-A3T ' Date 9125101 Froject EVame Niiddoroe F_ast 3rd Addrhon ,Ioh Na 12838 Projeet Lxatlon Ai 1C2, S 34, T 25 N. R44 E W iN • Qesigrser K. MCMLJLKIAf Drainage Basrn Name "F" Qisk Clir .P.tprvjecsl'! 28381pnwstring OrairEage Basin Qescnptivn ❑nsde F3lenatne 12838ME3xls '208" Panding Rrea Name swa9e Far Tomlinsorr Fvnsiing Rrsa Locahon vvest side af Woodlawn Dr Point af CcncentraUon Lov Pt, 37+75, Rt. -I SUaAREAS TiME aF GdNCENTRATION [Tc), minutes Lescriqtian Ar-res C A"C Overland Flow Ghannel Flow Imnenn=208"Arees 255 SrrnerrtAL.2= - AsPhaR Ravement 0185 090 0164 Ct = o.15 Z1 = 54 $ideuvalks 4.057 090 0051 L9 (A) _ ❑ Z2 54 E?nueways 4 039 0 94 fl 028 N(p] ° 04 8= D Ftoofs 0= 090 0000 S(A) _ O:a1 n= 003 Grass i.awn 0193 0.15 0.029 Te (A) = 6 40 s= 0007 flfherAreas- d ~ 0.35A ~ment 8 L1 {g} = Q Tc {ch } 329 Nisl = 4 7c(f1+B) = ❑ U4 5(g) = 4 Tc total 500 = Total 6asin Area, scres = 0464 Tc {B} 40 Irdensity = 318 Cvmposdo RurtaftCoefficient= 0Z9 Combmed {Rrea ` Rurtoif CaefficEerrt} _ 0.273 4{esfimated ~ d} = 0 87 s f.s Tme a^f GonoentraLan = 5.06 minutes °2[38° QRAfNAGE PAFiAMETERS °2W PavemernArea = 7950 sq ft. PEAK D15CHAROE. 10 YEAR 5T'ORM °208" 'Jolume Provrded = 332 cu, ft. at 8" cfspth , 5tarm Stora9e Previded = 332 cu. ft ai S" depth QQ C' C* A= 0.87 C.F.5 BOWSTRING C,ALCiJLAT1Clh15 na 94 #5 *t; #7 lJUMBEiZ and TYPE af t3f2YWELLS PROPOSED Tims Time Intensity 4 dev, V m V out Storage ° Incrmrrt €nermnt 7 Sing#a-Bartel {5pokane County Type A} {mrn } (sac,) {nlltr) (cfs) [cu ft.) {eu fk) {cu. $ ) 0 Dnu61e-earreE (5pnkna Gcurity TyFfe (#1'66) (A'C'#3) foud'#2 i#S-"} sT1If`~ s-'Es v`$e 4T,.,~ Outflow Pravfded. 03 c f.s g :sbu 3.16 oFZ r 32% ~ 2'gt 10 600 2 24 061 429 1$0 249 15 900 177 a.48 483 270 . 223 20 1200 145 04E3 514 350 154 25 1500 1.21 0 33 528 450 78 °208" T#tEATSiAElJT VpLilluTE 30 1800 1.04 028 539 sao _1 35 2100 091 0 25 546 630 -84 Ftequiaed G P.A pDndirig voluma 40 2400 0.82 022 559 720 -961 lmpennous "2Q8" Area x 1Z= 331 cu. fit 46 2700 0 74 0.20 565 810 -245 volume pronded at fa" depth = 332 eu R. 5(] 30DO 068 0.19 575 9Qp -325 ,pKr 55 33p4 064 ❑ 17 593 596 -337 so 3600 061 017 615 1080 -465 ' 65 8900 0.60 0.16 654 9170 .516 70 4200 D 58 016 580 1260 -wo 75 4500 056 0.15 702 1359 -648 STQRM STflRAGE VDLUME 60 4800 0.53 014 708 1440 -732 ' 85 51[]6 052 014 737 95W -783 Maximum s4arage required = 258 cu fk so 5400 050 0.14 750 1820 -870 ualume provided at 8" dsA = 332 cu ft. 55 5700 049 013 775 1710 -935 pKI 1170 5DD0 048 ❑ 13 798 18CIU -1002 SFmpson Engineers, Inc. W9 IyorLfr Arganne Road, 5pokane, YYA 992f 2 (W9) 928-9322 i Stormwater Urainage Repork II STORMWATER DRArNAGE CALC[JLLATIONS. (cvnt'rnued) Suh-Basin Fl Curb Clneninia a#`Law Point, Sta 37+75, right, WaodIawn L7n've h= 8 an. - 0 67 ft. Tatal height of apening H=0. I22 ft Depth af water at entrance Q= 0 30 cfs Total peak rate of flow Q=3.087(L)(H)3'2 for H/n <i, o r2z10.67_01s <1 L = Q - (3 087)(H)32 = 0.30 - (3.087)(0.122)312 = 2.28 ft Construct Curb Dpening, 3ft. wide, S in. deep 5ub-Basin F2 ~ Curb Ot)eninQ on Continuous ~`irade, Sta. 8+45, leit, 36`h Avenue a=2 in = 617 ft. Flawline depressivn at pgening y- 4 148 ft. Depth af flow in narmal gutter Q _ 0.22 Cf5 DF51gIl d15GhaI'ge ~ QaILa = 0.07 From F'ig 16{a}, Page 5-39 "Spokane Cvunty Guidelines for Starmwater Manageir3ent" L, = QI(Qa1La) _0 22I0 07 = 3 14 ft. Construct Curb Dpening, 4ft. wade, 8 in deep i ~ RATIaNAL FORl1AULA HYQROLOGY DF2AIhiAGE BASIN ANRLYSIS Frsr 90 YEAR STDi2l1A E11ENT Date: 4111100 PrcIect Narne: Middvme East 3rd Add'ttiQn ❑esign. kwm Prqect Number 12338 omk F~le NpnqMcWi zsagu atomni(hi 28ME3 x~ Ste Lncalion N 1/2, S 34, T 25 N, R 44 E'W.M ' Basm Name "F1" Basin f]escnphon' +rNaoliawn C3rode Poirrt of Cancetitrabon 5ta 37+75, 20' right SLIBAREAS kntensrty-QuratiQn fasr 1¢year 5tasm Everst Qesaription Acres C A'C Ti€ne Time Intenafty inr,rmnt Inermn#. Pavement 0106 090 0095 (min } (sec.) (m.mr} - ~23s'~(zer`}~ 4,~2a ~5~.'`n.. o.ra6 Rcre 5.0[} 30D.DD 3.18 _ 5 300 3.18 40 600 2 24 35 90t} 1.77 23 1200 1.45 25 15M 1.21 3[] 1800 1.04 Tota1 Basin Area, arres = 0.106 35 21(YO 0.91 Composkte RuriofF Coeffrcterd = 0.900 40 2400 0$2 Cambin$d (Area • Runaff Coef'icserrl) = 0095 45 2700 4 74 'S0 3WQ 068 I 55 3300 064 60 36Dd 061 , - YIME OF CDPfGENTRATkC]N (minutes), E5 39DQ [}.60 70 42DO 4] 5B Tc (v►rsdand ffow) Tc (gtJftr flow) 75 45Da 056 84 48DI3 053 Ct = 015 L2 = 125 85 5700 052 . ~1 = 36 90 5400 050 L1 (A) = 2{1 72 = 167 95 5700 0.49 #V(A) = 0016 9= Q 100 600U 0.48 5(A) = 0 R25 n= 0.016 s = 0006 ' Tc (A) = 0.23 d = ❑ 122 - L1(B) = 0 Tc (yuE ) 190 N(B) = 0 Tc{A+B} 023 S(B) = 0 Tc k4tal 5.00 Iritensityy = 318 PEAK 015CFiAitGE, 14 YEAR STQRiVl: Tc {B} = l?,Q Halding 4 45 ~ 4°C'4"Aa 0.30 C.F.S. Q(esdmated i@ d) _ 030 c f.s - T[me af Cvncentra~ion = 500 msnutes I i F1 RATI[7AJAL FC]RMULH HYDFtDLQGY - DRA1RlAGE BA5lN ANALYStS frx 10 YEAR STORM EVEN7 E?ate' 4111100 Prvjeci Name ' Midiiome East 3rd Addtjon Design kwm Projed hJum6er 12M , omx F[~ P "pctsil zsWMhDnan+rnl xaMMFS As Sft Lvcatton- N 12, 5 34, T. 25 N., R 44 2 W M. Sasan Name• "F'Z Basin Desenphan Wooftwn Drn+e PQrnt of Cancerttrafiast. Sfa 36+72, 20' nght SUE3ARE,45 iritens*v-Duratian for I 0.year Starm Event DESCSiptton Acres C A'C Trme Time Intensfty frermnt. Incrmxt Pavement 0.476 tl.S[] a.069 {min } (sec ) {inJhr) {N1°BO} 500 30000 318 5 300 318 '~0 Goo 2 24 95 900 177 20 1200 145 ~ 1500 1.21 30 1800 104 Tvtal $asm Area, acres = fl 076 35 2100 0.81 Camposge Runoff Goe#Foierrt = 0.900 40 2400 4 82 CQRlbl~ (Am1'` RGfloff C02ffiCieflt) = 0069 45 2700 074 , ~ 300D 068 53 33DO 0'G4 60 3600 ❑ 6S --T1ME OF C0NGENTRATfON (minutes)' 65 39M 060 i 70 4200 058 Tc (avertand flow) Tc {guttar Raw) 75 450E] 066 80 -0800 0.53 - Ct = 0.15 L2 =154 65 5100 0.52 , Z1 = 36 90 5400 0.50 , L1 {A} = 20 2:2 = 0167° 95 5700 0.49 N(A) _ 0.016 B = 0 9 0D 60DO 048 5(A) = 0.025 n = 0.016 s = 0.0065 Te (A)= 023 d = 0.1 D8 L1 (B) = d 7'r, Sgut.; 238 N(B) = 4 Tc(A+B) • 023 S(B) ° 0 Tc tatal 5.00 Interfssty = 3.18 PEAK DtSCHRRGE, ia YEAR ST❑f7M: Tc (B) = 0.8 Hvldirg 5.u Q= C*I' A= 0.22 G.F.S. Q (esbmated @ d) = 022 c f a Tsme vf Concentratrun - 500 minsites I F2 neaoB QEPTH OF FLOw ~y _ FEET . .DI 02 .LIS 04 .E3$ .06 a8 .l0.$ 3 4 .5 fi 7.8 .9 10 I ~-7-~.:.- T . ~ , -~t~ - i --T ~ , a ~1I~ 1 ! I C ~ I~~~ ~ 1 ~ a II V40 ~~y L 10 1~~' vs I E o E , ~ I t ' .oa 03 f~.az I ; ~ 01 ~ ~ a) D1SCHARGE PER FOOT OF ~ i a- ~y LENGTH OF CUR9 OPENING • s fNL€7S WFiEN If~TERCEPTING ~ --~`i+~~❑ ~ ~ 100°o +0F GUTTER FLQW ;Z ~ + t ~ .4 L I ~ 0 3{,q i (b) PARTIAL INTERC£PTE41V i---- i f aw. J~y I ~ 1 Ra'~Ifl Ft?R ENLETS ~3F LENGTH LESS THAhI L. 1- -4- -.z - I • f • ~ .10 ~ - 0OS .DS .DB ,10 2 .3 ,4 .9 .8 [ o LOLQ CAPACaTY OF Gl7RB aPENfNG fNLETS _ QN CDNTIfVUOl1S GRADE - 6-39 FIGURE 16 r NIDpl"CEQN t11939 f"'y~b1~A~~N'~r ; i N ~ f ~~'vtf m Ir~Al. -Z 35 TP kx s PiUE VttOUDLAwN DR1VF, I I 3 C~Cx2 + 41d?aZ D:~'-7665 ' p` ~~~+r~ ~ ~'~r'a~G ~ P ~~o~'~~' D•~~'~C.~Cre i 114, , 3~3 4 s : ~E13 r'c? 7 -113 > S34- L 9,617 , ([36) 1L OOGrI - 3 ~ ~ ~ ~1 ~1~•~~ o~~`l ~ ~ ~~~~,~Q1~ . ? ,n (,-Z L) Z-L6 L 6S sg 09 1 tb ~r - ~Zl o 9 v 1~1 Ili 5 N 1 s%4S I - o Z'~ ~ i CE1"ENTIOiV BASIN CSESIGN RATIC3NAL F[7FtMUL4 HYpRpLOGY &BUWSTRIMG hAEFHQO _ QRAINAGE BASlN ANAL1+SlS far 10 YEAR STORM EVENT _ L?ate 1125I01 Praiact Name MidElcme East 2r€d Addiflvn .4ob Nv. 12$38 Project Locabon IV 112, 5 34, T 25 N,R_ 44 E W M Desi9ner. K_ MCMULKIEU ❑tainage 6asm Name "[3`. Disk Dir A1 Ibawstring IIrairtage 8asin Dascriptan ansft Filename 92$3aads '208° Pondmg Area Name swale Far Twnlirssari Pondwg kuea Lowtivn sssuth side aT 35th Avenue Pomt af Conc.enhaban' L P. 9+50, Rt i ' I- - SUBAREAS T1NSE OF CG7NCEN"ffL4"911OfV Cfcl. minsrtes C7estnphan 11cres C A'C Overland Flaw Channei FEwv I rvtaus '20$'Ag!as' So Srmrtf A L2 ~ 290 Asphatt Pavemerrt 0.273 0.90 0248 Ct= 015 Z1 = 73 Sidswalfsg 0.033 0.9D 0.(]38 L1(]° Q 71 = 86 Roafs 0069 0.90 0062 N(A) = 04 B= 4 Qriv"ays 6093 090 0083 5{A} = 001 r~ = 0.03 Grass Lavm 0449 015 0067 Te (A)= 000 s= 6 019 d = o3» QtlfarRn~a3• ~Bqmenf 6: _ L 1(B) = ❑ Te {Clh } 2 43 i' N(B) = 0 Tc(A+B) - tT Om S(B) = 0 7c total 500 FotalBasin Area, acrgs = 0 926 Te(B)= 60 lrs6ensity - 318 Camposiie Runaff Coefficisrrt = 054 i i Cambfned {,area "RunoB C,oefficient} = 0 496 p(estrmaiei @ d) g 1.58 z f s i'fime oT Cartaerrtratan ~ 5.[10 rmnutas _ "208" ❑R111NAGE PARAMETERS - '208' Pa+uement Ama = 11870 s4- ft REAK D1SCHAft[iE. 10 YEAFt STORM "208' Volume Rrv+nded - 713 csi 8. et 6' deRth - ' Storm 5taraae Pravided = 713 eu ft, at deAth Q r C' d' R = 1.68 CF.5. SMSTidlA1G CALCULATICFNS #2 #3 A #5 9-1 NUMBEii and TYF'E of ORYVI7ELLS PRpF05ED Time Time ir+tensi[y Q diyv W in V au! StnrAqa ' Irrcrmrt_ Incrmnt, a Singlo-Banef (Spnksne Gaurrty Type A) [min ) {sec.) {rn.lhr} (efs) [eu N (cu. ft) {eu 1`0 1 QouhfesBarrel (SpoImne County Type 8) [#1'60 'C'93 {ouC `#2 f#5-08) 5~ 3 31$~ A''~ s3$' Ou[icw Provided 1 c.F.s, 5 30D 3.11 136 tis4 im 334 ia 600 2.24 1.1' zsa 6m aao 15 900 9 77 088 88O 900 -20 20 1200 1.45 032 837 1200 -263 , 25 1500 121 060 962 1500 -538 °248° IREATMEAST VOLUME 3d 1800 1.64 052 982 fBClq -898 35 2100 0.81 045 954 2100 •S 106 RQquued G p.A, Ponding volume. 40 2400 0 82 0 41 9018 2440 -1382 Impervivus °208" Area x1P2' = 495 cu. ft. 45 2700 0 74 037 1029 2700 -9 671 valums provided at 6° dePth = 713 eu R 5t] 30D0 0 68 0 34 1047 3000 .19W pK! , 55 33M 064 032 9oso 3300 -2220 60 3646 469 D.30 1321 3600 -2479 55 3900 0.60 0.30 1992 3900 -2708 70 420D 0.58 0.29 1238 4200 -29M 35 +iSM 056 (].28 1279 4500 -3221 STORMSYC]RAGE IJC7E.UME i i 80 98(ID 0.53 6.26 1289 48Df1 -3511 85 SiDO 052 026 1342 5100 -375$ Maximum sMrage requireci = 334 cu ft. 58 5400 0.50 025 1365 5400 4035 vnlume prov'tded at S' deptla = 713 eu ft. 95 5700 049 4 24 1411 5700 -4289 pKf 900 6000 048 024 1453 6000 -4547 SIr»pso►r Fngfneers,lnc. 905 Nerth Rrgvnne Rnad, SPokanQ, WA 99212 (509) 928-9322 I zmaea~.a ~ ~-i ❑[~F~1t•'I~C~~ Cf~LCUL~~i lvNS - ip-1W , .r: _M_. _ < ~ ~ s ~ ~eri~ ~ -4 - - - - Q - - - - - - - - - - -------4...__ ~ ~ - - - - - - - - - ~ - _ - - - • - • - - - - - - - _ _ _ _ ~ ~ ~ ~ _ . _ . - • - 07 ~ DT Y' tV e- 'vJ 0. y • DD ' - . ~ , . ~ I~ .T~ , l . a d • ° ~ ~ ~ . n _ • . ~ . "^Y~~ . . . \5 ~ . _ _ . , ~ a . , . ~ e . ~ . . _ - lllll. •l...J:: /i. ..r.. ~ ~ Zronc ~ur'b- _ ~ _ _ _ - -s _ ~ - - 10 , I . ~ • r _ • _ `-s~ _ GY'aSS- `~eC'~iES~na~ ~N'~0. DT ~ ; G.~S ~.5 _ - ^ \1,~L- yy,~_~~ ~,v~~- I------ ' • 5 Z5' Y,5- 11.•~ { Co .5 , I . ~iv? o~ ~r;ve.,rvla. Z.1001n, T' _T 4 . $ ~ 6 • ~ ~ ~D~~ Do~ _ ~ - . '.yr~'- y~~' c. • ~ t - .i , t I~ b(i'~fl/~rvi~GiL~~....t~~.~ k'1 1~~ -2-t 5'nta1p- B oiinrr, ~ _ - I 1 ~ ~ ~ v S Cn.TIr ~ r~R] . NF', ~an.' ~j ~ - -----.1.5 _ - e a ~i ~7~~ ~ , _ • . _ _ • - - - - - • _ _ k~y lAn°7r1~ ^ f•--~- - ^ - • I l} ~ ~ J Q ~a'~ ~ ~ Nkr ~Ac.~ ~a ',o~3,d ~`C u z3ti~.-a'~r~ _ ~S a 7* • • - _ . _ _ ~ • °l's '7~h~~ ~^~S y~ ~~~„r'~" ~ - a 1,L~!!~"~~i►~~1= E _•~~7_1~ ~l Q~~~ - • - .r ;~.'i'.~,rr~ i~ ,~i ~F . ~ • d • ` 9 ` • ' - r ~ ' •b ~ tr ' 1 ► , a - ! " c' ~ ' ~1'e~r~fi--_ 5~~ ` • • " a~ ..~~,,~.~-r,~~.`_.. r,~~~/fI •'~°1 ~ ~C'Q.. ' R' _ . ' ' 5 ' _ ' _ ' ' " ' " _ ' _ _ i 7 L7 I - _ . Y r~~ ~ _ _ • r~tn~t~A,"~'~~c] ~ _ _ . _ " ' I • _ _ . ti . ~ ~ Y~: ~ . ~ • - - • • - ° --.~ir ' _ ~ , '~~d - - - - _ _ _ _ } ~ ~ • - r~~- ` r - • - ~ ~y'~T. _ ~ - - - .z~.~ Qa~'1 ~ ~~~'~~~~a'~?~~ 7 -4 ~1,~'~~\~`~~\ 1_~ ~ - S-a r ~ - ~ ~ r • _ ~"A.y' ~ai 6 ~ . ~Q~~Q~ ~1~~~ - • i •7v,e~ --ZA _.....r ~rs~~ 1'°`~"~at~ ~~aC~~j~,►~~ - ~ p~~y -1~ ~ - '~~r.~ ~ ~~a~ • - - - - - - y3 l - ~ i,~:. ~ wt•~-_ ~ ~ ~r ~ L ~ ~~P , ` '1, tr ' o• ~ . . 6 ~ ~ e ° -1 ° : I %LL~ta•Q a ` ~ ° - I ~ f • - - ° • --1 - ' - - - ~ ~ : - ~ • ~xa ~ S~o ~ ' ~ 1 - • - , Th~-~, ~ - - - - - . _ _ _ . _ _ - - - - - - - - - - - - - - - - - - - _ _ - - I ~ ~ SL~iY~i~~ tt~~~ J %4 ~ i t'~L ~aa 3 ~ - DIF-►A1NAGS CALCUL.ATic>N, m M1 ,Dl i~ t7Ni -r_ L:;-FiS'T fkVDt `r[ v N 117,6/01 ~ ~ ~r~oe~ ~i~ewr~~~r r~ ~t►~, ~WI~ ' I&"? eI~ ~ 93f2-oa ~.13~~ ~c~~ • ~ T~v-~- ~a~Y~ ~v evt~e 5~oa.~'~' , ~d irc~►~ic+~ ~❑~a.~ . v ~r t~ fi~ 3~r ~ $ 3~ ~ $ ~ 35~~ ~~e~lnu~ : + ~ o z-I v! + nz' h'1.f(01 C, ~r k-:L... 0.4`~iv ~ fr 5t8r*WALr-5 ~ ~~k8+ 30(6,59 ~ 969 ~i.'•.~,9"~~t2 - ~ ~3~tvEs `3 -7 ~ ~ 9161- 4 -L+~~ ~ 11- -0 DO ~ 30r3b~ T'~y 049~5$ - - ~ ta~7- AS~ ~ 9 foz . 1 5 9- 0T1 -~S 1 ke UL~r £ W C.DVt S 1 d @.1 ~ 'D~5 fl e11 ckD ~ e,4 OlA .I 6 tp Ollr' ep4 . LI ~L++~ic I`~l a~. . G 0. 4 G u,~ R. s D~► $ - S 1 DfLI~GF, `~ix? i ---OL) N~~$` a.cy~, ' ~ ti~ ~►+.t~~. 4-77 5 T F F- 0v1 v~~ : 7 . ~ L-9' zi , a ~ aZJ -Z 14,1 ~7'1 - .6 L~' r~ 2 4 8 6•1)1 Vst} ~%Z'z = (,51){,~.~~) -H- '7, i+'~ EL ~z~~ ar~•~]~~ ~'k~ ~~L`1 ; I L .~4-~ ~Pz)~°~~ 3~~~-~~~In1d c523~~~~ . ~~'o So~~ S l!) 'd-tia~.~ tA s vaN\~ ~ N~►~.'d~ n`~~~~ 39'~N1~+~C'~ 18b1 -nj5 N ; ~ ~ ~ i 1 - C'~11~7t LD'M1~ T ~ DgAIt4kae CAk.CULAZtpNS ~ 4 _ _ - - - - - - - - - - - - - _ _ . ._..-.~.~i YY Y' • - - - ~G[7.S~Y~nC,4~+'~_ r-_.-._..v__ _ • i _-•••-~j ~ • - F _ . `,~4 - • • _ ° - ~ ~ ~.~I • ~.SF _ . _ e, ---•..._____.....~~.1 G~ ❑~1V'~~t+~CA~___ ~ .._....~__..__.........___v . ~ -V - . • • ~ ~ (1. ~Q 1 ~a"1-• q'- / ~ ~ ~ 1' ~ 7~ r ~ . 'C 1 a ~ - ' ' 9 . s f. . 0 ~ . ~ 7 ~ .1 ' ~ . • f ' ' ` • ;'~}'1~ SII~ ° F7.I f /~\r~f~'Yr~,~I ~ r ~ i~i~ y ~ FTI F ~1~7~~' ' ' ' ' ~ _ 1"' • tz- C. vnc . r . _ , . _ $.5~ _ f t, - - - ti - - _ C ~~C~•~`~C~.~~) ~ ( ~~~o~s~~3.~~} ~.~8 ~0".Il 4 29~,3~G5 C~__- - - ~[~.`tl -_--~.s . $ ~ - ~ . i I - - - - - - _ - . _ _ - ---..i ___.t_ _ ~~W ° - - I i - - i - - - - ~ _ r..___ - - _ _ _ , . ' g,SF- - w --•_~~~;~.5' - ° _ - a - ` TLag~ cf pravewau~_ m• _ _ _ - ~ , rl ~r~o Jo ~r ilj4~•~. _ ~ I~_ ~ (~~i ~ ~I.~ti,Yf P - _ a .'p 4. l' ' ' a-~, . a ti p- c 9 1 ' L ! I l . a t 7 L .4ffih~;~1~~~r~; ~ f1Y 1 _ ._.-..i o~ p-^!1 ~n~ ~~•/F µ l~r~•-~~~~~~~~,~~ ` : ►v~~.`~?'~~:7~,~~`~`~=~' ~1Y ~ Fq-~~~ ~e SA~le- 5, o', t 0~..~.. - - - - _ +-5~ Sw aA ~ k-9 ~ _ _ . - - • • - _ ~AN i. . ._..._w~.~._~~_____-- Q p,~•4_ - •w-••_ , _ - - - - - MIUILVML EAJT 3RD t1UDdTIV1V January, 2001 FounCe! 44f6 6& Z43Zp5m E?t f znf'm, Z= - Drt7 I nC7 ge CC] lCL! IQt18n 5 CwL ENciNEERS ec LANo suRvEYORs M.909 ARGOPIHE ROAb SPDKAHF. WA 99212 PN 926-1322 i Tl'PICAL SECTION. DRAINAGE SWALE ANd DRIVEWAY hlOT TO SCALE RI`" 7' 6 25' 6 25' 6 5 deep, curb cu# _ 200% LL . . 5 h In ~ . 1 ~ - • • ' ~ ~~'S> ~.t /F`~ ~~.Ita Gemenf CvncreteJ p ~a ~prr'~1°G ~~y4a~ ~ ~oncrete Cur~ ~5wale Battom slQ°e I ` 13' R!w 7 Crass-5ect9onal Areo af Swale I 6.25' i 6.25' J7'~ 6 5' ~ ; .68~ ~ (1/2)(0.5')(2 68') + {1]2)(0 s')(z.ss') = 1 .~a sq ft. .s0 4,$sz 4.67 0 67 - ' s* - TYPICAL SECTIDN: QRAINAGE SWALE 2' WIDE hIOT TD SCALE R /W ~ 13' ~ 7' 5 25' ~ 7' 5.25' 65' 6`, deep, curb cut - - ~ 2.QR39: ! 1 ~ ~3 SY min 07 ~ ~ . • . f hlormol swale 51r~ e ~ Cement Concrete ~ Concrete Cur~r and 5~dewalk - - Driveway \-Swale BC,ttorrr 10' R/''r to` Cross-5ectional Rrea nf Swols - + 5 25 2' S 25 1'i fi 5' i d - (1/2)(0 57(z 25') (i~'2)(o.s')(2-25') + (0 5')(2 t~') = 2.12 Sq. ft. z.7s ~ t22 5~0.s5 o 5s f aa Sti~ 45 'i QETENT[C3N BA5lN DEM}V RAMONAL FORIFIL1Lf4 HYDROLC3GY &BDWSTRING METFIOD , aRf1iN,4GE BA5[N ANHL,T5i5 fcr td YERR STORM EVEN'F Dale 1 f25FOt Frojed Aame Midilame East 2nd Pddihnn Jah Nn : 328:38 Prcjec4 Lcxaton. M 1P2, S 34, T. 25 N.. R. 44 E W.M , Designer K. NfCMLJt.HIN Draiftage Basin Name "F-0" Das [7ir A1 •16avrsUing L7rainaga Basin 17escripton: QnsRe _ Filename 12838.x1s "2(18°Fondfng Area Name swale For Tomlinson Rondiftg Rsea Lncairon east side of Nfrginta Road F'a[rst of Cnneentaalsars' E.R 0+38, FtE. SL[BAREAS T1ME OF d'>QNCENTRA71O3V ffcl, minutm Descrfablon Acres C R•C Ovedand Flaav Channe3 Flow jr+ae►vKws 20R" Ar&as - ~r►~enf A L2 = 356 Fisphalt Ravemer:t 0299 pSp 6262 Ct= 015 Z1 = 7.3 Sidgwalks 0.022 0.90 0.020 L1 (A) a Cs Z2 = 8.6 - Roois 0321 0.90 0.289 hl(A} = 04 8= 0 ' Onveways 0.D89 0 SD !].C155 9[A] = 001 n - 03 Grass Lavun 1 444 0.15 ❑.21 T Ts (p) ~ 000 s= 0 412 d ° 8.425 C7Hrer AnMg~ Sspmenf B- LI(B)= o Te (cn ) 3.06 N(B) = o Tc(A+B) _ 0 OD S(B) = 0 7c #atal 5 00 ~ Tofal 8asira Area, acres = 11140 Te (B) 0.0 lntensity = 118 CcmRes's6e Runaff Cam(flcisN = 4.39 Camksmed (flrea ' Runbff Coefficisnf) = 0 843 Q(esbmated d} = 268 c.f.s . T~me of CQrrcentmfian = 5{1(3 minuies °208` DRAI3VAGE PARAMETERS '2W PavemerR Area = 32676 sq, dt PF-4}C D1SCFfARGE, 10 YF-lft STORlN '208' Volume Premded - 588 cta R_ at 8' depl!'r . SWrm Starage Pro+uided = 588 su. ft et S' depfh Q=C' I* A= 2.68 C.F.$. BC)WSTRiNG CALCiJiJA'FIDIVS ' A A 95 ~ ~1 NuNtBER and TYPE at [IRYWEIIS PROPt35ED i Tima Tirrta lrtem[iy Q dev. Vin V ouS Swage . - Irtumnt IncrtnrtL 0 Sfngl&-Barrel {Spokane Ccn~aty 4ype q} na (min ) (sac.) (Inlfu} (cfs) {cu. ft} {cu fC} [cu ii.) 2 L7au6le-Banel (SpoIcane Courily Type S) 1`50) [R'C'#3} [outt(t1548} - a`"M :51~ a-% zti'Gr r ~i. 477' putl3ow Prmnded' 2 e f.s. :sEiu ~3.11 271Es 1677 SCm aTT 10 saa 2,24 1.89 1325 9200 125 W5 906 1 77 1 49 1435 18DD 43M 20 12DO 145 1.22 1551 2400 430 ' 25 1500 1.21 102 7634 30DD -1366 `2W YFiE,i4TMENT VDLUME 30 1$w 104 688 1867 3600 -1933 . 35 2100 4.91 4 77 1689 4200 •251 1 Requlred G.PaA. pondinri vcafutna. 40 2400 fl.82 069 1729 48pq -3071 lmpervious °208' Area x 10= 528 cu. ft. 45 270D 014 0 62 9 748 5Qp -M52 valuma prvvidad at 6` d0pth ° 588 cu ft. 50 30DU 9.88 0 57 1778 6000 4222 OKI ' 55 3300 0.64 0.54 1835 6600 -4765 ~ 60 5600 0.61 0.54 1sCi 7200 -5297 - ss 39M 0.60 051 20124 asM sr76 TO 4200 058 049 2103 8400 -6297 - 75 4508 056 0.47 2172 DDDO .6828 5°fQRM STC]RPsGE VC]LUME aa 4800 053 045 2190 ssaa -7410 - 85 51 W 0.52 044 2280 10240 -7520 Mawmum starage required = 477 cu, ft. so 5400 050 042 2319 1[18Ba 4848i votume provislad at 8' dspth ~ 5BB cu, ft. 95 5700 4 49 0.41 2396 11400 -9014 {}K i 100 6000 448 0.40 24E8 32000 •9532 Slmpsvrr Englnaers, lne. 909 North Argar+r+e Roat, :pokane, WA 9921$ (509) 9284322 ~ , Stvrrmvater L7rainage Report ; U. STORMWATER DRAINAGE CALCULATTONS. (continued) ' Basin H Midilorne East 2nd Addztion Curb flnenina at Low Pa'rnt, Sta 0+43, right, Virginia Road (Existing) h A S in. = 0.67 ft Total heigh# af vpening H= Cl. 105 ft. Depth of water at entrance Q= 022 cfs Total peak rate af fl❑w Q = 3.0$7(L)(T~""' £'or H/h < 1, 0. 105/0.67 - a 16 < r L = Q = (3.087)(H)"' = 0.22 - (3 087)(0. 1os)~~ = 1.90 ft Canstructed Curb Operiing, 3 ft. wide, 8 in deep Curb Oioeniniz on Continuous Grade_ Sta. 6+10, ~eft, 35'h Avenue (Existing) ; a= 2 in. _0. 17 ft. Flvvafine depression at apenzng y= O.D$ ft. Depth vf flow in narma[ gutter Q = 0.11 cfs Desigin discharge I_ Qa1L.a = fl 054 From Fig 1 G(a), page 6-39 "Spokane County Guidelines for Starrnwater Management„ L y QI(Qa/La) = o. 11/0.054 _ 2.04 ft. Constructed Curb vpeniFig; 3ft. wide, 8 in, deep Midilome East 3rd Additinn i ' Curb Octenina crn Continuous Crade, Sta. 7+00, left, 361, Avenue a = 2 in. _0. 17 ft. Flowline deptessivn at opening y= 0.09 ft Depth of flow in narnzal gutter ; Q = 0.15 c#s Uesign dischsrge QafLa = 0.06 Frram Fig 16(a), Fage 6-39 "Spoka.ne County Guidelines for ; Stormwater Mar~aget~ent" L = Q/(f~alLa) = 0.15f4 06 = 2.5(] ft. Canstruct Curb Dpening; 4 ft. wide, 8iri. deep i i ~ RAT3t]NAL f47RMUl.A HYbR6LOGY DRAINAGE BA51lV RNALY5IS for 101(E{IR STQRM EVEPiT CJafe 1R6101 Prcpt Name- Middvme East 3rd fddibafl ~ Desr$n, kwm Froaect IVumter. 92838 o,sk File nl VaWnanVrnixsseAs Sde Locatian N 1/2, S. 34, T. 25 N, R. 44 E. W.M 8asira Narrie: gH" Basin DsscripfiQn. 36th Avereue ~ Parrt of Ccrncertrafion• ~ Sta. 7+00, 1S' left SU6ARFA8 InlerrtsitY-I]urafion far 10-year Storrn Evenf QesCnqtion RCres C A'C - Time Time Irstensity Incrmrvt Ir¢vrrrznt Paverrent 0.051 090 0.[746 [mira ] {sec.} (inJtSr) i (wm 5.00 300 00 3.18 5 3(70 318 ' 10 600 2.24 15 900 7Tr 2Q 1200 1.45 25 1500 9 21 i 30 18t]d 9.134 _ Total Basin Area, acres = 0051 35 2100 0.91 Camposite Runaff Coefficiertt = 0.900 40 2400 0.82 - Comihnned (Area ` Rueoff Coefficient) = 0046 45 2700 074 50 3000 4.68 - 55 ?3DO 054 6[? 3600 0.61 TIME OF CONCENTRAi'ION [mmutes]' 65 3900 50 ~ 70 42i]B 0.58 Tc (vvsrfend itaw) T'c (gutfsr flaw) 75 45M ❑56 so 4800 0,5:i - C# = 0.15 l.2 = 88 85 5100 0.52 Z1 = 36 90 5400 [}.5[] i L1 (A) = Zi} Z2 = 0.157 95 5700 0.49 N(A) = 0.016 B= 0 100 EQDO 0.48 S(A) = 0.025 n = 0016 ~ s = 47.007"'I . 7'c(A)= 023 d = 009 - L1 (B) = 0 'Fc (gut.) 9 45 I N(B) = 0 Tc(AtB) , 023 ' S(B) _ 0 Tc tsifal 5 oo Irrtens►ty= 3.18 PEAK IIlSCHARGE, 10 YFAFt 5TOR{N: `ic (B) = 00 Molding 314 ~ QaC"I*A¢ 0.15 C.F.S. Q (estimated @ d) = 016 c f s. Time of CQncaentraticsn = 5.00 mirrutes I . Hi S7J i ~ - RAT1G1NAL F❑RMULP, HYYDRULOGY DRRINAGE BASIiU AfVALYSlB iot 14 YEAR STC]RM EVENT [?ate: 911 sI98 F}roject hiame; Midilome East 2rsr# Addttion Oesign. kwm Projecf Number. 1283B OskFle. A1 Vstien8lt7(A12a36 .ts She Locafian. N 1!Z S. 34,'f.25 N., R.44 E W.M. i, 6asin Idarne: °Ff° 6asm Desce#on. > 3w) A+venu 1-1 paint af Concentrafeon. Q SL~~ ta ~1 p, 7 S' keR ts~ ~ 8ll6AREAS: drrterisb-Duratton for # C~-year Stcrm Event ❑escrtpbnn ACm C - ,q•C ' . 7une Time lnYensity lncrmnL Irscrmrit Pavement 0.037 090 O.U33 (min ) {sec-} (inJhr) [r"ar - ~❑.0317 Qe S.QC? ~p.~ 318 - 5 300 318 10 600 2.24 - 15 900 - "d.TT 2D 1 2DQ 145 25 1 5M 1.21 30 18(,O 1.D4 Tatal Basin Area, acres = 4.[]:37 85 21 DCY 0.51 CQmpc,siie RunofF Coeificient = 0.9[]0 40 2400 0.62 Camhtned (Area • F2unpTi Coefficient) = 0.033 45 2700 4.74 5D 3[7DO p.6B 55 3300 0.54 - TtME OF C4]NCEtdTFLATION (minutes): 60 360U 061 ' 65 39DC1 O.W I 70 42DQ 0.5B T'e (averfand fiow) Tc {gtftr flosv) 75 45t7O 056 , 8t} 48(~C7 (3.53 ; Ct = ~ 15 L.2 = 9a $5 510D 0.52 i Zi = 36 90 5400 0.5] _L3 (A) = 18 Z2 = 0167 95 57DO 0.49 N(A) = 0.016 v 100 svDa oas S{A} = 0.0278 n = 0.016 . i s = 0 t]0T7 TC {A} = 0.21 d = D.LI$ - ' L1(B) ~ Tc (gut} 1 so ~ N(6) = a Yc{A+6} • 4.21 S(B) _ 0 'Fc tofaf 5.04 lNensity = 318 PER1i [31SCHARGE, 10 YEAR S7DRM: - Ta (B) = ❑.Q Hnldirsg 3.21 ; Q=ck+`A= 0.11 C.F.S. Q (e.stimaterS @ d) ~ o11 c.i.s. -Time oY ConcenbuUan = 5.00 minut$s ~ m RATICIAEAL FORMUtA FiY[3ROLVGY DRAINHGE 6R51N RNALY515 for 70 YEAR ST(]RI1fi E11ENT Qate 9115/s8 Proled Rlame: Midlome East 2zd Add`sfivn Design• kvvm Project Number 128M Usk F[k. A1:lrahona141011=$.& Site LocdQn• N 112. S. 34, 'f 25 N. R 44 E.WM. .~,e.-. Basin Name: 'Fi° Basin descriphon ~ Virginia Roaf Pmrrt vf Cortcentrafiun• ~ Sta. @+43, i 8' Frighf Y' S ' SUBARF_RS• fnterrsity-Durafran for 10-year 5torm EVerrt Desmpbon Aeres C A'C • Time rime Iniensfty lnerTnnt Incnnnt. Pavement a.G76 0.90 0.069 (min.) (see.) (mJhr) 5.D0 3DO OQ 318 - 5 300 318 ' 10 60D 2.24 ~ I5 900 . 9 Tl 2D 1200 145 25 1500 1 -21 _ TotaI Basin Area, acm = 0.076 3€1 18D0 7.04 35 29 CO 0.91 Carriposfte Rtus4#F Coeifiewrf - ❑.900 4{] 2400 0.82 corr,bined (Area - Runafi coefficierd) = o t3E.a 45 27DD 0.74 ; 50 3000 0.68 - 55 3300 0.64 - TIME QF GflNCEI47RAT1aN (mmu6es)• 60 36DO 0.61 65 39Da 0.60 - _ Tc {ovarland tJcsw} 70 4200 0.58 TC (guttar flrrw) 75 45U0 0.56 80 48t70 0.53 - Ct = 0.15 L.2 = 97 85 5100 0.52 Z1 = 36 90 5400 050 L1 (R) = 18 Z2 = 0167 95 5700 049 iJ(R) = 0.016 B= 0 700 6000 0 4B - S(A) _ 0.0278 n = 0.015 ° s o.Of377 ' Tc (R) = 0.21 d= 0105 L# (8) = 0 7'c Out.) 1.44 N(B) = a Tc(A+B) 0.21 S(B) = 0 Tc totat 5.00 Iniensity - 3.48 PEAiC D13CHARGE, 9o YEAR S"FORM: - Tc (B) = 0.0 Holding 3 46 Q =C`I"H~ 0.22 C.F.S. Q {estimated Qd} _ 022 e.f.s, T'ime of Concentraton = 5.00 minuFes H , DEPTH OF FL-OW - y - FEET .vz .as .a. .~s .as c av .z .3 4 ~ , , , . ~ - ~~--7~ i .s +-1 ~ -_.t - a ~ T ' ~ I I ' ° T"- -I ~ jj ,3 ~ .2 c~ La ~.08 L 77 ~ , - ~ ~ ~ C5. C~~' .aa ~ I l ~ .a2 L_! l oi - i.a 077 I .s ~ 4 a 3 d15CHARGE PER FC?DT OF . i ~Iv~ r k LEN~TH 0F CURB OAENENG kNILET5 WHEN iAiTERCEPTIMG i I00 °Io QF GUTTER FLOW ~ 4 ~ (b) PbRTIAL INTERCEPTI ON I+`•.8 pa RAT f❑ FUR lNLE T 5 O F 4 r._t LENGTH LESS THAN L. ~ ! ~ I x I I~[ - i r r!- oer i " _ as ar$ 0 .oe ro .z .s .a .s .s a 1.0 L/La ,~,?~.~t~ CAPAG~TY C]F Cl~R6 0~'EN1NG 1NLETS UN CQNTINlJC3US GRApE ~ 5-39 FIGllRE 16 ,i TH Pve, 'FAs IN Ik T,, 1 ~ o ~ o cl 3 wD t7 at0Lwh ~ Y l R~ a ` ^ • ~3 lv Au. °L iry 11t E. .'S L7 d"y dr Is . d,. e a'~'~ti~''~ t ~54`fl~~~4~ o.1~ ~ A (7-4O 4 ?,~~r 0.114-4; rn-~rL i ~ 5 ~t a t~ s e. u.Ct- ' C~~P.s~ ~'~U, ~C3❑ ~~~i~~ ~ ~3,~:~.~ i ^r f1~~946 acre p~is,~e~ a~re~ c~~ns;dered megl~g►bl~ ,~a~.d 4n~.1~~1e,~ o~r ~~.~rel~~~~ OhS i~e- Av- toi . DF.A.G C S RU 1~SID : uZS iGrv.c~~, ~Qw ~ir►v►.c~ ~ 774 5 ~ ar, ~ ~ i v~. ~ 1 cr $ 0'vr e.1 ~j ►r ~ w e~~ s ~ ~ Cr[ 5 Olk'~ ~ i ! ~ l 5I z K W ~•`l I L[~~S SAS-T V-W'm $P,S lN - • RE~L~t~~i~ f~VAEt~F.~~.~ - a ~ ~Zo }~1~P j r~T~ ~T 15 ~~i ~ ~~a`~ ~ ~ •°f ~ ~ a~ [56t,€0 '9 $ ~'Tz~ lE~ ~r•P e F~- ~ , ~~:E-'~ ~t~ ~ ~ S~ ~4~C4~~~g ~ ~ ~T~ 3~ ~ (z.k 7. ~ o -L f-t~~ R• 'FZ. 400 1-7 - (l5~; -z t-I.r { L5.~1~~~., F[~ ~~2~ - 3 ~ (?-A 7- f'C t4,3 -755 f -T. 1 ~ , f ~ , ; , ; - - - E w., _ _ _ . _ - • - . _ - - • • • . _ ..~;Y ~ , r; r - w ...~...a'w~+ r. - ~ . _ _ _ ~ w_' ~_"a~ ' _ _ .l3' ~ o.s ar~~---- _ ~ . . _ _ _ . _ . _ _ - - - = ~ - _ - - - Z)r,Lv~wa~_-- - - - - , - - - ~ - - - ~w ~ ~r•w•itr~'y~~,..~~ o,~:i . ~ 00. ❑.D1(a'7-cT•~F°r• " ' ~ ' ~a a 'r ~ + ' i 1 . • a, r 1, ~ ~ FT./"rY,-..,~~. _ _~_wu~l~_5.~~~~-- _rlor~m~`.S~°` _ _ ►~Cvn~., C uv- b _ - - --~Qr. ~y • _Cr.D55~.~.~~~ 1~.1*1~1i. . ~1~~~_~b~~~h,! o~~~,~- rrr`7~ ~ s J 1~6•~JL~.Z~~ 1- ~,z~~0~~~~3.~4~ ~ 1.`~ $ F~. _ - • - - - - ~~.1► .3_65 0_1 _ - - - - ~0.91 ! ' - - - - - - - - . _ 05 0.0 4• _ a : . - a . - !V ~ ~C~ ~~T. 1 7 ~Td~7 e ~ Ih f _ 1 ti t•~e _ . . ,q ~ . ~ - _ ° i o' _ ~ e 1 t . , ° ~ . ~ . ~ ~ ' 4 ~ , • ~ L . '~(j~1]jiC~Irt;'E?li~l',~i ~l►~r~,~'~1.Y1~~ -~+a.l•~~a1~_sfoFe_---------- a~~~`- - - co~c, i . - _ _ _ _ ~ w al ~ P~ o~ ~ t~ ~rn - ! - - - - - - Cv.~ 1~ ~.5'~--- Crvss- Se.ciivmal Are_w a17", Swatz- v-- _ o° !r~?- i ~ • C~ ! ,+~T~ - ~ - - - - - - - - - - - i ,~j• A°..-•__ ~ _ .,.~.Y_ - - ° • , , n~. MIDILOME EAST 3RD ADDlTlON Jonupry, 2001 ~ FUUMM 1946 imp~on Engimer•s, 1nc. D r a i n a g eCa I cuict i a n s UwL ensGINEMs & uwo suRVE°rvRs , N.sns ARcorrNE ROaD SPOKADIE, WA 89212 PH 926-1372 TYPICAL SECTION: aRAINAGE SWALE AND aRIVEWAY - NOT Ta sCaLE 13' R/w ~ 7' 6.25' 6 25° 6.5' r ~6' deep, curb cut 200% rn'Fl t2z , r ~ ~ ' " ' + • ' I~"'s j 7~ Cement Concrete lF# ❑ ti8~l ~ Normfll s~v[~le sbpe ~Concrete Curh ~ 5wale Botfom R/W 7 Cress-~Sectiono! Are❑ of 5wale 6 25' _ ~1'' 65' ~ zs~ ~ (112)(05')(2 68°) +(1/z)(0s'){z.ss'} = 1.34 5q. ft 0.67 067 ~ ~ TYFICAL SECTIDN: LRaiNAGE SINALE 2' WIDE NoT TO scaLE ' 13' RtW 7' ~ ~ ~ ~ 5 25' 3' 1' S 25' ~f 5.5' ~ ~ ~ ~ oa~ - E deep, cunc cufi a y _3 SX mmy Kr i ~ I- ! . ' - ~ J ' ~ : i ~ ~ Cement Concrete 0~~~ ~ Nvrmvl swale slope ~Cvncrete Curb and SidewQlk priveway --Swr1e Bpttvm ~ iD' R/W ip' Cross-5ectional Areo of 5wale ' 1 525 2' S25 65' ~ (}I2)(0-3')(2-25') + (1I2)(0.5')(2z5') + {a.5')(20') = 212 54 ft 2.25~O 2 25 056 0.55 1.00 ~ ~5 ' DETENfTIaN 6A51N T]ESIGN RAT16AfAL FORMULA HYDROLQGY $ 601N5TRING dVlETHt7b dRH[IVHGE BA5[N ANALY515 for 10 YEAR STt3RM E1fEY+lT Rato 1126109 Projeet Name: iNidfleme East 2nd Addition ~3 IF-ID A•A A. Jab No. 128W Project kocation. N 112, S. 34. T. 25 W R 44 E WM , tlesigner 1C MGl+illLKEN Dra[rra9e Basin hlsme "P' pisk Oir.. A! lbnvvstring prainage Basin Aescnptian• ansde - Filename 1 2838x1s °208" FblTdltia ArC'd N3A7@ swake For: Tamlinsars PandIng Pirea Locatian souBr side cf 3M Avenue Poirst of Concenirsbon Ste &FC6.50, i3t. SL1BAREAS TIlhRE 0F C{=EN7RATIO!'J (Tc), minutes DescnaUm Acres C A'C tharland Flaw Clvanne1 Flcrrv fmasrv{acrs 208'"LA119as• Seax*rtfA; L2~ 415 Asphaft Pavemen4 03Q4 fJ 9E} 0.214 C! = 015 Z1 ~ 4.S 5idervalks 0.057 0.80 0 051 L1 [Y#) ° D Z2 4 45 Rooft 0138 0.90 0924 N(A) = a.a aM z or+veways 0.116 o.so 0104 s4p,p a 001 n= 003 G►ass Law, 0995 0.15 0149 rc (A)= oDO s= 0.0094 d m fl saa OtherArees. som,rertt B L1 {B} = p Tc [ch ) 3 79 N(8) a a Tc{A+B} - D.OA 5(B) = 0 Te total 500 Total Basin Area, scres = 1610 Tc (B) O 0 trtensily a 31 8 Camposb Runvff CceffieieM = 0.44 Cambined (,qrea • RunoTf fi.*efficfenf) = 4 703 ❑{es6rrxited @ d} R 223 c gs, , Tirre of Csrscefttratioa = S.Dm minutes "208" C3RIUN4GE PAFLAMETERS "208" Pavament Ame = 13246 sq, ft PF-+RlC DtSCHARCiE. 10 YEAR 5T[7RM '2UB' Vvlwm Pmvided = 755 cu. ft at 5' depth Sform &tora3e 'Fravided o 755 cu. R at 8° dePth pmC' I' A= 2.23 C.F.S. 8[3WSTRING CALCJLRTlQNS a A lib oo NUMBER and TYPE af DR'PWELtS PROPOSEI] Time 7ime Infensity Q dea. V in tl out 5taran Inermnt Ir~rmrR ~ 2 Single-Barrel (5pokane County Type A) {min.) {sec) (srsJhr) tcfs] (cu. R.) {cu ft.} {cu R.} D Double-E3errel (Spvkane [:aunty Type 8] ~ 5.00 . 3. .i fiF Outflov Provlded. 0 B c fi s b Liw ;ki d 2M3 495 180 li'F 70 660 2.24 1.57 1905 360 745 16 8m 1.77 1.24 12-06 540 705 , 20 1200 145 1.02 1327 720 507 ~ 25 150D 1.21 6a5 1362 900 462 "2W TREFITAAENF VQLLlAl1E ~ 30 18DO 1.04 T3 139(] 1 U8D 310 35 2100 0 91 064 1406 1280 148 RequirQSl G PA ponding rrolurrre. AO 2400 6 82 D58 14+32 1440 Z impsrvious "2[78" Area x 1R` _ 542 cy ft- 45 2700 0.74 0 52 1457 1820 -163 vcgumaprarrided at 6' dePth= 755 cu fL 50 3010 0 86 048 1482 1aw -31 B p}{+ i 55 m 0.64 045 153D 4980 -450 ' 60 3600 0.65 043 1587 2160 -573 65 5900 4.50 Q.42 9687 2340 ~'i53 7D 420D 0.58 d.-01 1753 2520 -767 - 75 4500 056 0.39 1$11 2700 -M sroRM srORAGE vaLUME so aeaD 053 027 ieze 2880 -1054 85 51[30 0192 0.37 19(}4 3060 -1159 Maxlmumstaagerequired ~ 745 cu ft 90 544A 0.50 0.35 1933 3240 -1307 aatume RmAded at B" depRhh 4 755 cu ft 95 5700 0.49 034 1998 3426 -1422 pN(I - 700 6= 048 034 2456 3600 -1 542 5fmpsan Englneers, 1nc. 908 Nutflf A+sgonea Roed, 5pokane, WA 982t2 (509) 929-1322 Stormwater Drainage Report - II STORMWATER DRATNAGE CALCULATIdNS. (continued) Basin I Midilome East 2nd Additinn Curb Onenine at I.ow P'oint. Sta. 5+06 28, right, 36h Avenue (Exasting) h=$ in = 4.67 ft Total height af apening H=O.48 ft. I]epth of water at entrance Q= 0 11 cfs Tvtal peak rate of flovv Q= 3.Q87(L)(H)" for HIh <1, 0.08l0.67 = D 12 <1 - L = Q - (3.087)(H)312 = 0, 1I - (3 087)(0.08)3i2 = 1.58 Canstruct Curb Opening, 3 ft. wide, 8 in. deep Midilvme East 3rd Add'ativn Curb Ouenine an Continuous Grade. Sta. 35+91, teft, Woadlawn DriVe a= 2 in. = 0.17 ft Flowline depression at opening y=[3.f)96 ft Depth of flow in nvrmal gutter Q- 0,20 cfs Design discharge i QalLa = 4 466 Frvm Fig 16{a}, page 6-39 "Spokane County Ciuidelines f❑r ' Stazmvvater Managemment,> - L = Q](QalLa) = 0.2010.466 = 103 ft Caustntct Curb Opening; 4 ft wide, 8 in deep RAT1OA(AL FQRMilLA Hl'DROL4GY DFtAfNAGE BAS[hf ANALYStS far 10 YEAR STDRM EVENT Date 9115198 Project Name- Allidilame Easi 2nd Addbon Qes'sgn: kwm Prooe Numher. 12M8 _ Usk Fiie A1.Vabana1M12a3aads Site Lxafian: N 112, S. 34, T 25 N., R 44 E. W.M. Basin Name Basin Description. ~~tt;Avvenue Poini ot` Canaeratratan 7 Sta 28,1 V Right t~gL ( a~ SLlBAf2EAS IrstensitH-Duration for 10-year Starm Event Desortptimn Acxes G A`G Time Time lntensity Inermrft ]nrxrtsnt Pavemer+r ❑.o38 0.90 0034 fn,ir,.y {sec.) CinJhr) - ~~~'y~►~`~ = ~e5~ 0.03 t a~11- 500 300.00 3.18 a 300 3.18 10 fi06 2.24 15 HIX} 177 20 1200 'i.45 25 1500 121 30 i soa 1.04 Total Basirr Area, acres ~ 0.038 35 2100 0.91 Cvmposte RLnaff Coefficcient = 0900 40 2400 (}.82 - C:vmhined {Area' RunoFF Coeffi6ent} ~ 0 D34 45 2700 0.74 , 50 3000 4.68 55 3300 Q.Ca4 50 3600 0.61 TfME pF CQhICENTRFITI❑hf {minutesl' 65 3900 060 ' 70 42Q[1 ❑ 58 - ~ Tc (averlarrdflaw) Tc (gcrtteri9csw) 75 4500 0.56 sIl 48M 0.53 ~ Ct = 0.15 L2 58 85 5100 0.52 i Z1 = 36 90 5400 0.50 L1 {A} = 18 I2 = 4167 95 5700 049 N(A) = 4A1B B= Q 100 SDOO 048 StA) = 0.0278 n= 0.016 s = 0.{3dTI Tc (,q) = 029 d = Q.UB Li (B) = 0 Tc (gut.) 103 N(B) = 0 Tc(R+S) ~ 021 - Sp = a Tc #ota1 5.00 lntensityY ° 318 PEAK DISSCHARGE, SO YEAR'STORNi: ~ Tc (a) _ 0.0 3-1old'ing 2.07 I Q=C"I*A- 0.11 C.F.S. Q {esbmated @ d} _ [l 11 c.f.s. ' Time ot Cancen3ration = 5.00 runutes i RATIONAL FORMUlA HYC]ROL[]GY bRAINAGE 9AS1N HNALYSIS far 10 YEAR 5TORM ElIENT - Qate: 116101 Praject Narre Midilome East 3rd Adddian Desrgn' k►ym Projed Idumber• 72838 - [hskFde Pspropcts~1283BrabrmanIM12aUrne3)6s 5ite Lacaiion: N112, S34, T. 25 N, R 44 E. W M I _ ~ 8asin Name. 17" Basin 0escnption ~ VHoodtavsm I]r'sve t Pomt vF Concertra4on: ~ Sta 35+51, 2[}' feft •---..~.---v~.-_-.-~--- SLJBAREAS Irrterisdy-Duratian far 10-year Stsxm Erent - mescriptan Acres C A`C Time Tcme lntensty incemrt IncrmrK Pavemerrt 0.069 090 0062 (min ) (sec.) {[n.lhr} Ti-scs} 500 30000 39$ 5 300 3.18 10 6m 2 24 16 90D 177 20 12410 9.45 25 1500 121 , • 30 1 soC! 1.04 Tatal Qasin Area, scms = 0069 35 2100 0.91 Cgmpdsde Runaif Gaefficient = 0900 40 2400 0.82 combined ~~urtaff coeffiotent) ~ 0.062 45 2700 0,74 so 3000 o~ ~5 330D o:sa sa 3600 0.61 TIME aF CONGENT'RATi[]N (minutes). 55 3900 4.60 ' 70 4200 0.58 Tc ('averiend flow) Tc (gutter flow) 75 4503 0.56 80 98i)0 0.53 C4 = 0.15 L2 = 150 85 5100 052 Zl _ 36 90 54[]0 050 L9 (A) = 20 Z2 R 0.167 95 570a 0.49 N(A) = 0046 B= a 100 6000 0.48 S(A) = 0.025 n = 0.016 s = 0.01 - Tc (A) ~ a.23 d = 0.096 Li (6) = a TC {gut } 207 , N(8) = Q TIXR+B) . 0.23 _ - 5(B) = 0 Tc totai 5.D0 intensityy 318 PEikK DISCFfARGE, 7Q 1'EAR 57DRAA: Tc (B) = 0.0 H€dding 5.34 ~ Aim C* I* A p D.ZQ C.F.S. Q (estimated @ d) 0.20 c.f.s. , Time of Cvncentration ~ 5DO minutees I n aEPTH OF FLOW - y- FEET 01 02 .03 04 45 06 08 !Q 2 .3 4 .5 6.7 .8 .9 1.0 1.0 Y E ; ; ~ ; I I f~,; .s i ! i~_, ! 1 i ~ I I I I ' .6 4 ~fi p ~ I I I~ I I ~ i ~ ~ I ~ , i4j j .z aa T---F I ~ i ~ L° ~.,o F E_C)~ P 1 Y.O B .os 05 .Ua lo, .03 ' I I 9 ~ ox t~- I~~j~t~ ' . 1.0 t I ' I ' I I t~~ DIScHaRGE pER FOva OF I s~.~ s 6 LENGTN OF CLlRB C}PENIIVG INLETS WHEN ENTERCEPTiNG 1 ~ .s ; 100°re OF GUTTER FLDW .4 (b) PARTIAL INTERCEPSION o° RATID FdR INLETS OF -t- `i- I..EN!G7H LESS THAN La 2 I. T s 1 I 0,0 ~ / I r r e of 0 '000 y ~ .QS .05 .0e .tO .2 .3 4 5 .S .A 6.0 L/La CAPACITY OF CURS OPENtEVG INLETS (7N CONTINI}OL15 GRADE 5-39 fIGUR£ 16 Starmwater Drairiage Report TI. STQRNWATER DRAINA,CrE CAf.CULATIONS ~ Basin K ~ -Area Y 'I'otal = 20,250 sq. ft. N0.4649 acre ~~~~ment = vaovdtawn Dr.= sta. 3 6+3 s ta 3 9+00 (23 l')(20i) _ 4,620 sq. ft. - 0 1061 acre s3deWalks =(23 l')(6-5') = 1,502 sy ft 0.0345 acre Driweways =2 driveways at (28 5')(24') = 1,368 sq, ft. - 0 (]314 acre Roofs = I rvvfs at 2,000 sq, ft.lhvuse = 2,000 sq. R- 0.0457 acre Impervious =4,fi24 +1,Sd2 + 1,368 + 2,400 = 9,490 sq ft. - 0.2179 acre Grass Lawns = 26,250 sq+ ft. -9,494 sq, f}. = 10,760 sq. ft. N 0.2470 acre Stara-ae Reauired: a} "208'° S#orage Required =(4,524 sq. ft. ){1l2"= 12 in, per ft.) = 193 cu. ft. b) Bvwstring = 208 cu. ft. + 1 5ingte Barrrei DryweH, Type A(0.3 c£s out) Storaize Provided. Swa.les: 214 cu. ft > 193 214 cu, ft. . 208 BASIN PAV~MENT AREA "208" STORAGE SWALE STORAGE ' REQ[Ti~'tED AVAiLASLE , -K (23 i')(20') = 4,620 5q. ft. 193 cu. ft (5l'){3.50 ft 2) _ 214 cu. ft. ~~tal 4,620 sq, ft. 193 cu ft. 214 cu. ft. i [3F-TEPJTiON BPSIN DES1GN RA7l(7NAL FCIRMULA HYL1ROLOGY & BOWSTR1PlG METf10}] _ DRA€r~E BASIN ►vNALrsIs tF ta rF-AR srORM EVFr4r Qate. 1r"1 Pra1et Idame MidiEome EssY 3rd AddFdon .3ob fda.: 32538 Praject Locaffan. N 112, S34, T. 25 Id.. R 44 E UV M , Designer• K. MCMULKIfd Qrainage Bastn Name: "M` Oisk PJir.; F':iprojsctsll 25381b~g Qrainage Samn Descnption OnsRe Filenarree• 12$38ME3xls '208' Pondi1€g Hrea Nama ervafe Far- Tornhnsan Porrding Area Lacabvn. we.st sids of Woodlawn Dr. Pe[rrt Af Ccnncentratian. Low Pt_, 37+75, Rt. - 5U8AREAS T1AAE QF C(3NICEf1'i`RAT10H! fTc3. mmutes [7escdatian Aeres C A'C Werland Fionr Gksanns3 Flaw ImDaevratrs '208'Areas swA. L2 125 Aspha@ Pevemerrt 0106 0.90 0095 Gt= 0.15 Z9 = 5.4 5idervalks 0 035 0.90 0039 Lt{Y1y = 0 Z2 = 5.4 _ Drveways 0031 090 0.028 N(A) = 0.4 B= p Raafs 0.046 0.90 0.441 5{A] = 0.01 n= 063 Grass Lawn 0.247 015 4037 Tc (A) = [)0 a= 0.006 d ~ 0.342 O~herArees. L1(8)= Q Te (ch.) 1 78 N(B) _ a Zc(A+S) - 0= 5($] ' 0 Tc toul 500 a ~r = 338 Total Bastn Area, ecras = 0465 Tc (a) 00 frdens Cvmpvsb Ru€mf! Cs+affrcisrd = 0 50 C,ambinsd (Area ' RunoFf Caefficfeat)- 0233 0 (ebtmeted @ d)~ 0 74 c f.s Time of Concerftbon = 5.00 minuEas "203` DRAlNAGE PAR►WIE'TERS "2W Pavemard prea = 4620 sq ft. PEA1( DISCHARi`sE, 10 YEAR STOFtJN *20ir Voluma Frc+ncFed a 214 cu. ft at B' dept, 5tcrm Stora9e Prandod a 214 cu R. at a' tiepth G! a C` I• A= 0.74 C.F.S. BC3NfSTR11+iG CALCULATIt)NS im iT4 ib alb #7 NLlMBER and 71'PE of QRYWELLS PROPZ?5ED Time Time trrtensffy Q dsv. V in V caut 5t►sage Inermrtt. Incrmnt. t Singls-Barrei [5pckene County T]+Pe a) {min ) {s~.} (infir) (CfS) [M !i) {cu R.} (dr ft.) 0 [iouble-8aure1 (SPafmne CauntY TYpe S) WC-#3} fouff'#2 n% s:'1U 674 2% KOO QuSRow Provided• 0.3 e fs. iwpuu ~ 5 3iw 3•11 ofTa 298 gu 2ZU 10 600 2.24 0 52 367 180 187 15 8f10 1.77 0.41 414 270 144 20 92Ilp 1.45 0.34 440 3M 80 i 25 75m 1.21 0-2$ 452 450 2 208'TREFITNIENT VOLUME i 3D 9800 9 09 024 461 540 -78 95 2900 8.91 0.81 467 834 -463 Re4uirad G PA, pandinS votume• 40 2400 0.82 O.18 478 720 -242 ImPerviciss "2[E' Pea x 1R' a 193 eu, ft. 45 2700 6.74 017 483 810 -327 valume prodided ffi 6" elep#s = 214 cu. ft. 50 3000 0.68 a rs 492 goa -4DB aw ~ ss 33DO 064 0.15 sos sw 4m sca ssDO 061 0.14 527 1080 -553 - Bv` 39W 0.60 0.14 5w 1170 -69 0 70 42f,tO 058 014 582 4260 -678 TS 45M 056 0.13 601 935D -749 STORIdf STUR4f',E VOiUME 80 4800 0.53 0.12 606 9446 -834 85 5100 052 012 631 1530 -8w M1llaximum ,taraga rsquired = 208 cu. R. so 5" 0.50 B.i 2 644 1BF0 -979 volume pmAded at 8'° depth = 214 eu, ft. 95 570O 4143 0i1 663 1710 • 1 D4l p~~ 100 60DO 0.48 Oi] 583 1800 •1117 Sl+rrAsvrr E►rginears, Inc 90 Nor'tIt Arganne Roed, Spokane, 6YA 99717 (SI9) 9264322 ' ' x Stormwater Drainage Report 11. STORMWATER I]RA,INAGE GAI.fCLTLATTQ1VS• (cantinued) F3asin K Cnrb C7nenina at Low Paint. Sta. 37+75, left, Woodlawrt Drive h= 8 in. = 10.67 ft Total height of apening H = 0.122 ft. Depth of water at entrance Q= 0 30 cfs Total peak rate of flow Q _ 3.087(L)(H)32 for H/h < 1, 0.122/0 e7 = a 18 < I L = Q (3.087)(H)"2 = 0.30 (3.087)(0.122)' ~ z 28 ft. Canstruct Curb Dpening; 3fk. vaids, 8 in deep i RAT[Q1VAL FORIUiULA HYDRC3LC#GY DRAIidAGE BASIN AtWkI.YSlS for 10 YEAR S7ORM EVENT Date 7126101 Pmpct IUari3e, AAvdiEvme East 3rd RddAsara ❑esign- kwm Prpject Number, 72MB OM F~~ P XpojechAiza9avmb=n9Ml 2838ME3jds Site Lor.aGon. NI1Z S 34, T 25 N., R. 44 E W.M Basm Narrse. °k" Basin Qescriptivn. Wvodla4m brnre Pvirtt of Goncentratiar►' Sta. 37+75, 2[f' left SUBAREAS 1ntensrtl+-6uration for 1p-Vear Storrn Event Descnpton Aares C A`C Time Time Intensity , tstcrmnt Incrmrrt. , Pavement ❑ 1 05 0.90 0.095 ~min ) (sec } (in-Ihr) Wi*sa] ►~~~~~'~~c'~~ ~Y ~`^D~.R~C~ ac~~ 00 5 300 318 ' • 10 600 224 15 900 1 77 20 1200 145 25 15DD 4 21 3(] 1800 104 Total E3asin Asea, acres = 0106 35 2100 0.99 Cvmposite RunofF Cofficient = 0.900 40 2400 0.$2 , Combined (Area' Runoff Coefficient) ~ 0.095 45- 270[] 074 50 3Qd[? 0 68 55 330(3 0.64 50 3600 61 - TIME i7F CDNCEIdTftATI0H (mirsufes). 65 3900 0.60 7[3 42DO a 5$ _ Te (overlsnd fiow) TC (gufter flo►v) 75 4500 4.56 80 4800 C1.53 ct 0.15 L2 = 125 ~ 5100 052 Zl = 36 90 5400 0.50 L1 (A) 20 Zc = 0167 95 5700 0,49 N(A) = ❑[316 6= Q 100 6000 048. 5(A) = 0025 n = 0.016 _ s = [}.006 1'a {A} _ 0,23 d = 0122 - L1(B) = fl Tc (gLt ) 7 90 N(B) _ 0 Tc(A+8) = 0.23 S(B) = To total 500 imensity = 3.9 9 PEAK C71SCRARGEy 110 YEAR STORM: Tc (B) = 0.0 Holding 445 Q° C* I' A a 0.30 C.F.S. Q(esbmaied g d) _ ❑ 3(l c f s Time of Goncentratavn = 500 mirrutes I N Stvrmwater Drainage Repart _ U. 'STOR,MWATER DRAINAGE CALCULATIONS ' BssinL I . _ Ai'e3 Tatal = 32,000 sq. ft. - 0.7346 acre . Pavernent = Woadlavvn I]riVe = H.P. 39+00 tv E R. 43+07.73 _ (408')(20') = 8,160 sq. ft ~ 0. 1873 acre S1deWalks =(4(]8')(6.5') =2,652 5C]. ft 4 0609 a.Cre I]niveways = 4 driveways at (28.5')(24') = 2,736 sq, ft - 0.0628 acre Roafs 1 roaf at 2,000 sq. fR Ihouse _2,000 sq. ft. - 0.0459 acre Imperrivus = 8,160 + 2,652 + 2,736 + 2,000 = 15,548 sq ft. - 0.3569 acre Grass Lawns= 32,000 sq. R: - 15,548 sq, ft. = 16,452 sq. ft. - 4.3777 acre Stora.ee Reauired: a} "208" Storage Required- '(8,Jb0,sq ft• )(112"-12 in.,per ft.) b 340 cu ft. , :'b) Bovvstring = 414 cu. ft.'+,1 S,ingle Barrel Daywefi, Tyge :A,'(0.3 cfs Qut) Existing , I . - • ' ' . . ' _ 5' • ' :t' ' . ' ' _ ` „ ' . Stfli"Size PT[?Vlded: ' _ . . , • . - _ ~ - . S'WaleS: 498 Gil. ft. S 340 49$ Cll. ft. 7 414 BASLN PAVEMENT AREA "208" STORACrE SWALE STC]RAUL - - REQUIRED AVAILABLE - ~ L1 ' (165')(20') = 3,300 sq. ft. 138 cu' ft. (1001)(1.34 ft.) = 134 cu. ft. - tn L2 (45')(20') = 404 sq. ft. ' 37 cu. ft. (48)(1.34 ft. 2),= 54 cu. ft. ~ ~ L3 (s6r)(2a') = 1,720 Sq. ft 72 cu. ft (20)(2.12 ft. 42 cu ft. L4 (86)(20) _ 1,720 sq. ft. 72 ~u & (61)(2.12 fi. 2) - 129 cu. ft. L) (26')(24') _ 520 5q. ft 21 Cil ft. (61)(2,12 ft. ) = 129 GU. $ Tdtal ' $,160 Sq ft. 340 Cit ft. 498 Cli ft - []ET£hPTiOfN EfASIRI DES[GN RHTIONAL FORiVIUlA !-i`1`DRDL4GY & BDWSTRlMG METFdOD aRAINAGE.BASIN MIA1.Y8lS for 10 YEAR 5TORAA EVENY ' . Date' 1rmf IRto)eet Neme: Miditame Eaat 3rd Addido;r Job W. 12838 Rraject Lardon N1f2. S. 34, T 25 N., R. 44 E W.M C]esigner K MCMULKIh! Qrairnage 8asin Name ..L" [9isk Dr • P:0*jects11 Z8381bowstrIng {]minage Bas'rn Descrtption: Onsft Filaname. 12838ME3xls '208' Pondm9 /Uea Rfame: swale Far 7rtmlinson Pandire8 Area [.ocaLon eag side crt WoodlaFrm d]r. Point of Conaan"tion Law pt., 42+50, Rk 5U8A{iEAS TIME QF C[7NCENTRATfON (Tcl. Qrtinutss Descripfian Acres C A`C Overfand FW Channef F{ow tm-no'n- 708"RresS' ~~nartt AI. L2 ~ 350 Asphatt Pavement 0187 O1SO 4.169 ot = 0.75 Zf = 54 Sidewalks 0.061 o.S9 0.055 l.1 {A} - 0 72 = 54 Dmreyalr3 0.063 0w 0057 N(A) a 0.4 9= d Roo% '0.046 0 9U 0.049 S(A) R OAi n= 0.03 Grass Larrn 0378 41$ 0.057 Tc (A) = 0 OU s= 0.01 , d = 0.373 Oti~er' Aress - a~mm, errt 8. ~ L1(@) _ 0 Tc (ch.) 3.65 N(B) = Q Tc(A+B) a pZO - S(B) _ (i Tc bftl 5.00 - T6 (8) 0.0 lr1G9R51#y a 3.18 Tatal 8asln Area, acms ~ ifl 735 Carrrpasfto RunoffCoifflclsrit= . ' 0,51 Comtifned (Rrea ' Rutsnf6 Coefficuont)- - ' 0.378 Q (esLrnatad @d) 1.20 C.fs - - - - Time Qf Cancefflratinn = . - 5_dm [ninutes '20E' E7RPilNAC;E PAfTRl4(ETEftS - ' "21U)" Pavement Area = -8180 s4'R ' PEAK Dl.SCilARl3E. 10 YEAR STOR4! "2[Ig' 1fDl!lRiO PiGYlded ° . , 498 CEl. fL Ht G* d0pth - - . - , _ ft1R! $twBge PK31/ided = ...49$ p3.M, ' aC d8pt7 "Q a .f: ` I ' Al ~ I.~ C.F.S. 'Bt7WS'TRihiG•6LGULATICNS : ' • , , . , , - _ . , •`I - `=7W7i . -02 1 wi , . A 46... 1~1 -~1+IlJM9ER and 7MPE of •3RYWELJ.S PRC3R65E[7 - - Trre . ,Tirrta ' ~lntar~ty • , c] dev.:" . V,in ° . Y a,J 'St~ga Irrcrtnnt ' -Pncrmrt. ' • _ . ' - 1 J Sfnglo-8arrel ($€okans Co:tMY T87e A) ' _ (min.) (sec } Onfir) (cfs) Icu. ft.] {eu R.} {ai. it1 d -Douhfe-Barrel (SPokana Caunty Type B} - C#1* [d•C"~~ ) (~'~2] (#~g) ' v`tf0 s"18 , i"~v , aM ffC, 39'3' QtMow ProMttsd{ 0.3 c.f.s. b ~ i'b tm +s ~ ;i" 10 ~ 2.?+~ ~Q.85 594 980 414 - _ t5 900 - 1.77 067 670 • 270 400 20 1200 1.45 0.55 713 3w 353 zs 1500 121 o_as 732 450 282 °208'tREATMENt' voLun~E 30 , 80D 104 4:39 74= 540 2a7 35 2100 0.91 o 34' 757 630 127 fdoquired G.P.A. Pondtrg +ro[ume: 40 2400 082 031 775 720 55 Impervious'208 Prraa x 10= 340 eu R. 45 2700 0.74 028 783 $1 Q -27 valuma Prrnided at 6" depth Q 498 cu. ft. so 3000 4.68 0.26 797 900 -103 ' OKI 55 3300 0.64 ' 24 823 GeQ -1 B7 - ' 6D 3sm 081 0.23 , 853 '10w -227 ' - , ss 39M 060 0_23 907 1170 -263 70 •4200 om 0.22 m 1260 -317 75 4500 0 56 021 974 1350 -378 STOiM STORAGE Vt]LUME BO 48R0 0.53 02f? 982 1440 -458 ~ SS 5400 0.52 020 1022 1580 -508 NEmcimum stnmge requiret ~ 414 cu. R s9 5400 050 019 1040 1620 -agU volume providW at 8' depth = 498 au. R. 95 5700 6.49 019 1474 1710 -636 OKI 1oo 6000 048 018 4107 1800 -693 Simpswl Eag)neera, lttc. 909 North Argartne Road, 3pvkeRe, Wil 89242 (509) 92S-1322 iWFtJq L No. 1Z~ MDEA 5 T L~~ Kt1% C P,1- c~+~h-~~❑r~~ ~wM - _ . _ - - - , ~lw - - - - - -----s__ _.ro m~~-k - - - - - - - - . _ _ . ~ " Tv,? ai `Drivewa~ ~ 2.(!fl01° `001 C~ • e • a • ~ • ' i ~ ..~t L . t . R . o . . - _ p' ~_~6 _ _ _ - - - - - ~ - , - - - ta ..t _ ~~s _ . _ _ _ - - - - . _ _ . . _ - - C.ros.s- Sec-tirrr,cj r'•reoc o~ Swa.le - _ - - - - rf~~ ~s _ l j ( n . i~ ........,~y.-.,~..v~~J ~b,5~~1_._'~'-~°~+f ~ `~`'~Z~~~=-~~!Z~~!$_.~.=_._ ~•~~C ~ -2.6 g/ -7!'!on!FMt"``~,~~ ~~F...~ ._°a~~_~ 6~-` _ _ e..___ - - ~_~~1 ~ - • - 1 •••.v._.._ T _ ~ _ • - - _ _ _ - - ~ _ _..____.__.W _ _.t~ • o---~ as~~me~v~~- - - - _ I_ - . . _ ~ ~ . _ ~ _ - ' ~ ~a-_° _ . - f - ~G~ v~ ~riV~V+l~s~d 2.C10~O i , .s i~l~-~i-~ I ^s' , ~+~3rr I. e. ' d~ . L •e Rirf I a v \ • _ . . q '!'n~ :~~d - . ~ ~ , , _ .~1, l; ~ . n. ~ . ~ i~, _ ~.~r rn~e~ ~ t R r~ a,~ _ • _ - ~ w ~1 ~ 8 o~r~am _ - - c . C u!~ k~ czr. 5 ti c~ ~~w al ~ . 5.25 L r ~ - .z :25 2,35 _ • - - _ _ z•• _ _ . . - • _ - - - 5~s~~~ . ~y ►.Yrr . l ~~~0..~~~~Z.zS} ~r [~.5~~z ~ ~c~.5'}~~,~ ~ ~ - --Q~~•="-. . .a,SG. ~.~o__ ---4~-5~_.. _ _ _ _ • - _ y ~.1'~ M#DILOME EAST 3RD ADDITION Febru°ry, 2000 Favnaed 79A8 69 impsm Engineers, Iaac DrQ I n Q gECC1 lC l.! latIof1 S CIwL EwciNEERs & waQ suRvEroRs hP.909 ARGOhINE RQAD SPOKANE. WA 99212 PH 928-1322 TYPICAL SECTIQN: DRAINAGE SWALE AND DRIVEWAY WC3OaLAWhl DR! VE NOT TO SCA LE ~ ~ 10' R/W 10, 20' ~ i ~ ~ 6.25' 6 2t 6 5' f 6°' deep, curb cu# z aaz ~ . -7 _-3,57 m,n ea ~ Cernent Cnncrete-/ 'p \-Normo! swole sfape Cvncrete Cur6 ❑nd 5idewQik C7rivewau Srvale BoFtom R/W 6.25' r 62 5' 5' Cross-5ectional Area of 5wole 8 25s I.__tl(1 /2)(c~ 5')(2.68') +(tf2)(0 5')t2 68'} = 1.34 sq, ft. . ~ 067 0 67 s ¢'~s~ o,~s~ TYPICAL SF-CTION; aRA1NAGE SWALE Z' WIDE WOODLAWN DRI VE NOr Ta scALE ~]w ~ 1 D' ~ , _ 10, 20' i" 525' ~ 1' 1' ~ 5.25' 6" deep, cwb cut I _ 2.af?~ R1irY (14 ~ . . • " . - ~ ~ ~vr~-a~E swole sEp e Cernent Cancrate~ V~ p ~ Concrefe Gurb and 5tdewalk ❑ravewoy S'WOle BiC3ttDPi'S ip' R/w tfl' ~ Cross-5ectionaE Area of 5wale ~ S 25 1 2' i 5 25 1' fi 5' I { ~ (1 l2)f0 5'7(2.25') + (1 /z}(o 5')(2 25°) + (0.5'){2.0'} = z 12 sq. ft 2 z~ ~ a C~.55 ❑ 56 1.[3C~ 0 2 - 4 s 2~2 x~~ ; , r a~~ Try a depCh af 1.2' 4-4.1 DrywelIs - Precast cancrete dry- welIs, as showd on County standard 2/3 lIZ drawj,ngs, may Fe used to retain stvx~a V~~.485 R S R a A~ea drainage in soils with a very ragid per- ~ ~etted gerzmeter meability. Types A and B IJsywells in ~ 2'xT.21+(2xl.2xI.2) a 5,28 s.f. t'he folZawiag soils may be designed za infiltrate a zate of flaw cf 0.3 cfs aard 2 --2(1. 22a-2e 42-) 7.36 fr • 1.0 Ct8 TeSpECtiVelp': Bang Marble R - .717 Sontter Phoebe ~Garrison ~ ~ in,~da3 ~ w 4 1.486 (.7I7)2I3 (.42)II2. 5.61 fps ~g~ `o3 The IvGatians of these sviI types aare shawa in the Soil Caasezwation 5arvice Q a VA - 5.61 fps x 5.28 sf = 29.6 cfs Soil 3urvey far 5pokane Cuuntq. 'I'he draiaage ragnrt shall faClude a eopg af = 30 cfs d- 1.21 the 5CS map with ehe subdivisiaa platted thereon. Z'Eae Caunty Engiaeer shall re- SvlVe Dc: Try 1.3' qvire the deveZoper ta provide a sieve analysis and sQil type test from a soils i.aboratory aecegCable tQ the Ca~tp Ea- 4- g (b Dc)3 D, 31~ gineer if there is a Question regarding b + 29 Uc the above seil tppes. 3A 2 In ruraT areas, as def ined in Spokane ' a432.2 (2+2x]..3)3 Y, 1.3 a 30.9 cfs County Raad Standards, apen gravel dry-~ (~+21=1•3) we3ls map be permitted in lien of the 30.9 cfs - 30 cfs dr °1.3' precast cancrete dryweZ}.s. _ D ~ ? Il.~, flow is supercritiea7.. Precast concrete drywplZB progosed fnr use in other soi3s tlian those shawn Since the flaw 3s supercritica]., care above and a:LI apen gravel dirpwe3ls shall shvuld be taken ta provide a propeY de_ be desigaed accordiag Ca gerealation sign ar points where horizantal andjar rates datermi3.aed by afield test cony ►rert.ical, a].ignaent ehange. forming to the Manrsal of Septic tank practice. A County insgeetesr shall he A free board af .30d should 3e applied preseat during aZl percolatioa tests. A percolatiaa test caZculation sheet ' D- .30 X 1.2 ' 1.56' signed and sealed by a regisCered Givi1 _ engineer shaTl be submitted. Tae ger- 5.6 fps 7 maxfmrsm alloraabTe. colatian rate shall be equal zo or greater than 72 f.nches per izauz ro he Provide rip rap. (Refer to Sectian acceptahle fcar dryweTl construction. 4. 5' ) 4-4. Z Storage Facilities - Detentf on , 4-4 Deteation/ltateatioa 8ystems -The storage faciZities may 6e uaed to regulat geak rate af rs~n-~aff frvaQ aa existiag e f~aw rates. 9,a. over~Ios~ type storage system wdzich regvlates the site shall ttot ba inereased due ta the rate cf prr~pased deveZopme~r.t far a given rdesign outflaw sh~.~ be used. See starm. Tt►ersfore, a retentioatldeten- ~igures 4--3, 4-4, 4~-5, aad 4~6 for tion faeflity* on-~site srfll be requ~.red. su~~sted detaiZs. Landscaped facil~ itfes such as parks, playfiel+3s, tennis Date: 414I$4 courts, etco ars recnmmendecZ for 4-I5 MidIome East 3ra Addition ROAI7WAY SLTRFACIlVG DESIGAT: The Spvlcane County Alternative Pavement Design (Interim) fvr Local Access Pavement Structiues was used for design of the raadway surfacing. From the ta.b1e, Lacal Access F'avement Siructures, the fallowing informatian is needed tv deterniine the required sutfacing degths. 1) The type of street must be 9ncal access 2) Sfli1 type (as classified by the Unified Sofl CYassification System) 3) The average daily traffic, A.I7T Street Type: AlI streets uithin the plat are designated as lvcal access (residential) Soil Type- The geotectuaical ertgineering report shvws that soE samples were taken at 3 test pits within the p1at. TP-1 was at the izatersectian of 35`hAvenue and McDvnald Street, TP-2 was at the intersection of Woadlawn Drive and 3e Avenue, and TP-3 was afi the intersectian of 35~' Avenue arid McDonald Street CradatiQn analyses shvw the soil sarnples froan TP-I are classified as GP-GK TP-2 are classified as CK and TP-3 are classified as GM based on the Unified Soal CIassi.fication System notation. (See gevtecfnical test results) Average Dtily Traffic, ADT, Woadlawn T)rive will have average daily traffic counts of less than 200. In the future, this road may be extended south and the ADT count could increase to the 240-600 range. Therefore, this rvad will be canstructed at 1 D0% buEd vut for the future candition. 'I'he remainirtg roads, 35th Avenue, 36th Avenue, and McDvnald Street, will he short cross streets each with average daily traffic courrts of less than 200. A table erfthe street rwmes, design data and the roadway siFrfacing depths is included. - SUMMARY OF RC3ADWA,Y SLIRFAGING DEPTHS: ry±~. > ~1d~~Y ~'+a~~~~~~ J+~ ~ L`~~~`~ • nF~ ~$>Fr+ nu i fF~ , ~t/liFJFFr.FF 'h Wofldlawn DriVe Lvcal Access GM 200-600 Z" ACP Class A assumes 100°/o build out 7" Crushed SurFacing 35th Avenue Lvca! Access GP-GM 0-200 2" ACP Class A 6" Crushed Surfacing 36th Avenue Local AGcess GM 0-200 2" ACP C1ass A 6" Crushed Surfacing McDnnald Street Local Access GF-GM 0- 240 2" ACP Ciass A, 6" Crushed 5urfacing ~~CAL A►CCE55 PAVEMENT STRUCTURES AVERACxE aAlLY TR►4FFiC SOIL TYPE 0- 20[1 204-600 600+ - GIIV 2"/5„ . 2flfGol 210/610 1.7r Ln/61a 277 ''i1/7r~ ~ r~ ~nn 2il6 , 217$" GC 2111711 2'7801 3176" SW 27711 SP 2e1f611 2771F L .711'DCyil S A A ?14f']11 2I Ir+8F! 1rJ~+f~~11 i~n r r SG Pavement Design M!. 311/610 301181, 4"/611 CL Pavement Design OL 41117'e 51771' 678" MH Pavement ❑esign OH Pavement Design PT Pavement C1esigri 1) Soil type is classified by the Unified Svil Classification Sys#em. 2} Required thickness is given as inches af asphalt concrete pavement over inches af crushed sur#acing. SPOKANE GOtJNTY ALTERNA7E PAVEN[ENT DESIGN - (INTERIM) - _ 3820 E. 9rvadway Spakane! Weshington 99202 btadinger & assa►ciat+es, inc. geotechnical & materiat engineers Kevin McMulkin, PE ]une 30, 2000 Simpsan Engineers N. 909 Argcmne Road Spokane, WA 99206 Project Number M00170 PFtO]EGT. Midilone East, 3"° Additian 5gokane, WA S'UBR.'CT Resuits of Labcrikatory T'est;ng Repart # I Dear Mr. McMnikin, At your request, we have prawided iaboratory testing servicvs for the subjec# praject. Our services were limited to the perrformance of specific Iabaratory tesfi.s, selected at pour discretion. For Ehis period aur involvement was limited to the excavation of 3 test pits (Tohn Deere 31 0 ' backhoe) and sarnpling of soils exposeci by the excavation. The Cesf pit locations were seiected by , yara prinr to aur site visit. Twa samples were ta.ken from eaah test pit ane near the svrface to represent paverrient subgirade soil, and one near the ba#tom of the test pit to represent soils thaC may - be affeeted by storm drainage. At ynur reguest, the fvlPowing tests wsre canducted on each sample in generat accarda.nce with the rnethads lasted. 1. Muisture Cnntent A5TM I3-21 l6 2. Atterberg Limits ASTM D-4318 3. Gradation ASTM D-422 Soils were then classified according to #he Unrfied Svil Classifieation System (ASTM D-2487). Ftesults are presented an the aitached Laborutory Summary. ,i _ dt has been a pleasure to be of service to you an this project. Tf y❑u have any questions, please ca11. Respaetfuliy 5ubmiriecf: ~ BLIDLNGER & ASSOCIATES, I+IC. ~ ~.-E5" Thomas A. I'oints, EIT Staff Engineer ~~/sa AifdrPCC,w • a f1lESCb[TIERiS ■ I..&bOldtiSry rallin[!Iff[y F.C. Budlnger PE 5tephen D. Burchett PE (509) 535-8841 Jahn E. Firrnegan PE FAX f5091 535-9589 Scatt L. Walters Midilome 6ast, 3rd Additivn Project Number MOD 170 5pocane, WA TABLE 1 . ~ LAB(]RATORY SCIMMARY LIRTITS L~'lCA'I`iON McDana[d 5treet 8c 35th Ave VVocuiland Drive & 35th Ave McDonald atreet & 36th Ave TEST PIT" NUMBER k ] 2 2 3 3 L7EP1'H TflP ft $ 1/2 7 0 7 BOTTf]M ft 1'lx 10 1 9 T 9 ~AWLE TYPE Bulk Bulk Bulk Bulk Buik E3ulk MC]ISTtJRE ~ % 7.1 3.2 ~ 5.5 , 5.2 ~ 7.5 3.6 LIQLTID [.IM[T °/0 3$ 39 PLASTTC LIIVTIT % 25 25 PLA$TICITY 1Ni7EX °/0 13 14 iJMFIEQ CLASSIFICATION ' GP-GM GRGM C'iM +Ci'V4' GM oW 5" GO8$LES lOQ 100 QoQ 3" ' , , - '$$'s' _ ',;i '°•r~l~a"~::~ ~ r ;~;=;``r~=~.~~ "~~~'s'~.~ ~y 7~';;'~h'"r~~';~,.~. ~y'#,j,3 r;~~_~.,'• ~+,7 t~:,~,~'~s' . .-t , •'T. . , r , v~J-~„`~;~ I~~VQE~.se~,, ; ^ ~.~^;.4 _ r . 5 i'h" °Jq $Q $3 79 S$ $7 $9 3 1° 74 76 76 75 81 89 E 314" GR►+1VEL p GT 70 d$ 59 75 67 V 112" A 54 62 5$ 42 64 52 . E 3J8" S 41 52 4$ 32 55 35 #4 S 29 35; 7 - r;~ _ - . < • . , ~ .SAw. . ~ EVi.~.,'„~i'Et~~i~i~~.y^~',~w 19 . S #10 d 23 20 25 12 29 9 A #16 N 21 91 22 9 25 6 Z #30 SAND G 19 8 20 7 22 5 ~ 944 18 7 19 fi 21 4 9100 15 C 17 5 19 4 #200 12 - - 3 _ 16SILT ' budinger & assoclates,Inc. geotechraicaf & rraterial engineers