Watershed Work Plan for Watershed Protection and Flood Prevention West Cherry Creek Watershed

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- 20 - Page 2 of 2 TABLE 3 - STRUCTURE DATA FLOODWATER- RETARDING STRUCTURES AND OCHB INATION GRADE STABILIZATION AND . FLOODWATER- RETARDING STRUCTURES West Cherry Creek Watershed, Colorado Total drainage area above No. 7 is 9.82 square miles; total above No. 9 is 2.01 square miles. As defined in Soil Conservation Service Engineering Memorandum No. 3., Revised, dated March 14, 1958. Date: July, 1958 Drainage Area Sq. Mi. 9.82 2.56 2.01 1.01 6.50 31.45 Storage Capacity Sediment Ac. Ft, 115 19 27 10 70 342 Floodwater Deten- tion Ac, Ft, 455 70 74 1 7 20 7 1,034 Total Ac. Ft. 570 89 101 27 277 1 Surface Area Sediment Pool Acre '30 5 8 3 12 90 Floodwater Deten- tion Pool Acre 80 16 15 8 23 208 Maximum Height of Dam Feet 31.2 34.3 31.5 19.4 42.2 xxxx Volume of Fill Cu. Yds. 68,463 37,4oO 35,000 Lo 73 2 000 337 Emergency Spillway Type Earth Earth Earth Earth Earth xxxx Frequency of Use Years 25 25 25 10 25 xxxx Design Storm Rain- fall Duration Hours 6 6 6 6 6 xxxx Total Inches 5.5 5.5 5.5 5.5 5.5 xxxx Bottom Width Feet 350 175 X50 110 240 xxxx Design Depth Feet 2.5 2.0 2.0 2.0 2.5 xxxx Design Capacity C.F.S. 3 1 000 1 1 000 855 627 2,040 XXXX Freeboard Feet 5.0 4.0 5.0 4.0 5.0 xxxx Total Capacity C.F.S. 9 2 800 3,325 4,200 2,090 9,800 xxxx Principal Spillway Capacity C.F.S. 164 55 55 21 58 xxxx Capacity Equivalents Sediment Volume Inches 0.24 0.14 0.25 0.19 0.20 xxxx Detention Volume Inches 0.64 0.68 0.68 0.45 0.67 xxxx Spillway Storage inches 0.74 0.37 0.66 0.43 0.38 xxxx Class of Structure (a) (a) (a) (a) (a) xxxx Site Area Acre 5 2 2 1 3 22 Spillway Area Acre 6 3 4 3 5 40 Total drainage area above No. 7 is 9.82 square miles; total above No. 9 is 2.01 square miles. As defined in Soil Conservation Service Engineering Memorandum No. 3., Revised, dated March 14, 1958. Date: July, 1958