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- 19 - <br />TABLE 3 - STRUCTURE DATA <br />FLOODWATER- RETARDING STRUCTURES <br />AND <br />COMBINATION GRADE STABILIZATION AND <br />LOODWATER- RETARDING STRUCTURES <br />West Cherry Creek Watershed, Colorado <br />Page 1 of 2 <br />ITEM <br />UNIT <br />STRUCTURE <br />1 <br />2 <br />3 <br />h <br />5 <br />6 <br />Drainage Area <br />Sq. Mi. <br />2,11 <br />1,07 <br />1.40 <br />1.86 <br />1,97 <br />1.14 <br />Storage Capacity <br />Sediment <br />Ac. Ft, <br />27 <br />11 <br />15 <br />17 <br />20 <br />11 <br />Floodwater Deten- <br />tion <br />Ac, Ft, <br />5o <br />24 <br />28 <br />50 <br />39 <br />20 <br />Total <br />Ac. Ft. <br />77 <br />35 <br />43 <br />67 <br />59 <br />31 <br />Surface Area <br />Sediment Pool <br />Acre <br />8 <br />4 <br />6 <br />5 <br />5 <br />4 <br />Floodwater Deten- <br />tion Pool <br />Acre <br />15 <br />7 <br />9 <br />12 <br />14 <br />9 <br />Maximum Height of <br />Dam <br />Feet <br />33.1 <br />20,9 <br />18.8 <br />19.5 <br />20,0 <br />19.9 <br />Volume of Fill <br />Cu. Yds, <br />35,000 <br />11,300 <br />14 2 400 <br />25,400 <br />17,300 <br />10,000 <br />Emergency Spillway <br />Type <br />Earth <br />Earth <br />Earth <br />Earth <br />Earth <br />Earth <br />Frequency of Use <br />Years <br />25 <br />25 <br />10 <br />25 <br />10 <br />10 <br />Design Storm Rain- <br />fall <br />Duration <br />Hours <br />6 <br />6 <br />6 <br />6 <br />6 <br />6 <br />Total <br />Inches <br />5.5 <br />5.5 <br />5.5 <br />5.5 <br />5.5 <br />5.5 <br />Bottom Width <br />Feet <br />150 <br />110 <br />140 <br />125 <br />200 <br />115 <br />Design Depth <br />Feet <br />2.0 <br />2.0 <br />2.0 <br />2.0 <br />2,0 <br />2.0 <br />Design Capacity <br />C.F.S, <br />855 <br />627 <br />800 <br />713 <br />1,140 <br />656 <br />Freeboard <br />Feet <br />4.o <br />4.o <br />4.0 <br />4.0 <br />4,o <br />4.0 <br />Total Capacity <br />C.F.S. <br />2,850 <br />2,090 <br />2,660 <br />2 <br />3,800 <br />2,185 <br />Principal Spillway <br />Capacity <br />C.F.S, <br />52 <br />43 <br />28 <br />49 <br />22 <br />21 <br />Capacity Equivalents <br />Sediment Volume <br />Inches <br />0,24 <br />0.19 <br />0.20 <br />0.17 <br />0.19 <br />0 <br />Detention Volume_V <br />Inches <br />0.68 <br />0.68 <br />0.45 <br />o.68 <br />0.45 <br />0.45 <br />Spillway Storage <br />Inches <br />0.36 <br />0.47 <br />0.63 <br />o.58 <br />0.39 <br />0.38 <br />Class of Structure ?/ <br />(a) <br />(a) <br />(a) <br />(a) <br />(a) <br />(a) <br />Site Area <br />Acre <br />2 <br />1 <br />1 <br />2 <br />2 <br />1 <br />SPiilwajr_ Area _ <br />Acre <br />4 <br />2 <br />3 <br />3 <br />3 <br />4 <br />1/ Includes about 0.23t runoff which discharges through the principal spillway. <br />1 As defined in Soil Conservation Service Engineering Memorandum No. 3., <br />Revised, dated March 14, 1958. <br />Date: July, 1958 <br />