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Painted Hills FEIS Appendix N - MAY 2023
APPENDIX N: 100-Year Floodplain: Current vs. Headworks Failure Scenario This page intentionally left blank. 45343.9097 45343.9143 45343.9086 45343.9085 45343.9058 45343.9033 45343.9094 45343.9029 45343.9093 45343.9100 45343.9059 45331.5001 45334.9060 45343.9099 44032.9151 44041.9093 44041.1403 Spokane Image Consortium, Maxar, Microsoft Painted Hills PRD Painted Hills API Parcels with 100 Year Floodplain Change 100 Year Floodplain (Headworks Failure Scenario) 100 Year Floodplain Overlap (Headworks Failure Scenario) Current FEMA Flood Hazard 100 Year Flooplain Regulatory Floodway 0 200 400100 Feet Parcel # 100 Year Floodplain Headworks Failure (Acres) Current FEMA 100 Year Floodplain (Acres) 100 Year Floodplain Change (Acres) 44041.9093 2.89 2.70 0.19 45331.5001 0.00 0.49 -0.49 45334.9060 0.00 4.11 -4.11 45343.9029 1.54 1.97 -0.43 45343.9033 1.65 1.45 0.20 45343.9058 1.61 1.41 0.20 45343.9059 1.44 1.37 0.07 45343.9085 2.09 2.44 -0.35 45343.9086 1.19 1.55 -0.36 45343.9093 0.96 1.17 -0.21 45343.9094 4.28 4.78 -0.50 45343.9097 0.26 0.01 0.25 45343.9099 2.70 3.00 -0.30 45343.9100 0.18 0.32 -0.14 44032.9151 <0.01 <0.01 45343.9143 1.01 0.84 0.17 Reach River Sta Profile Avg Depth Max Depth Vel Chnl (ft)(ft)(ft/s) Golf Course 2863 100-yr 0.5 1.0 3.8 Golf Course 2578 100-yr 0.4 0.7 1.1 Golf Course 1981 100-yr 0.2 0.5 1.3 Golf Course 1647 100-yr 0.4 0.7 1.1 Golf Course 1547 100-yr 0.5 0.8 0.8 Golf Course 1489 100-yr 0.5 0.9 0.9 Golf Course 1404 100-yr 0.4 0.7 3.4 Golf Course 964 100-yr 0.6 0.9 0.6 Golf Course 528 100-yr 0.5 1.0 0.9 Golf Course 402 100-yr 0.4 0.8 0.8 Golf Course 276 100-yr 0.5 1.0 0.5 Golf Course 178 100-yr 0.6 0.9 0.4 Golf Course 36 100-yr 0.4 0.6 3.5 Golf Course 23 100-yr 2.0 2.0 1.2 Average 0.6 0.9 1.4 Golf Course Overflow Reach - 100-yr event Reach River Sta Profile Avg Depth Max Depth Vel Chnl (ft)(ft)(ft/s) Golf Course 2863 100-yr 0.5 1.0 3.8 Golf Course 2578 100-yr 0.4 0.7 1.1 Golf Course 1981 100-yr 0.2 0.5 1.3 Golf Course 1647 100-yr 0.4 0.7 1.1 Golf Course 1547 100-yr 0.5 0.8 0.8 Golf Course 1489 100-yr 0.5 0.9 0.9 Golf Course 1404 100-yr 0.4 0.7 3.4 Golf Course 964 100-yr 0.6 0.9 0.5 Golf Course 528 100-yr 0.6 1.2 0.6 Golf Course 402 100-yr 0.6 1.1 1.1 Golf Course 276 100-yr 0.6 1.2 0.9 Golf Course 178 100-yr 0.7 1.0 0.4 Golf Course 36 100-yr 0.5 0.7 3.9 Golf Course 23 100-yr 2.6 2.6 1.3 Average 0.6 1.0 1.5 Golf Course Overflow Reach - 500-yr event