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_ Mr. Dan Matthews <br />', March 30, 1983 <br />Page 2 <br />• Sediment Volume + Runoff = 3,941 Ft3/Acre <br />Pond #1 <br />Total Storage Capacity (G~llons) _ <br />150 Ft. X 68 Ft. X 4.5 Ft. X 1 Gal. 3 = 449,278 Gallon: <br />0.1337 Ft <br />Storage Required for 10-Year, 24-Hour Event (Gallons) <br />= 3941 Ft3 X 6.67 Acres X 1 Gal. 3 = 196,608 Gallons <br />Acre .1337 Ft <br />The above calculations show that Pond #1 can handle <br />more than tcaice the rainfall in a 10-year, 29-hour event. <br />The figures below show the average precipitation per <br />year. By correlating the two, it is evident that Pond #1 <br />can accomodate average precipitation without discharging. <br />Rangely Station: 10.1"/Year - Precipitation <br />58.9"/Year - Evaporation <br />Water Balance for a 1-Year Period: <br />Precipitation = 10.1 In. X 6.67 Acres X 43,560 Ft3 <br />• Year <br />Acre <br />X 1 Gal. 3 X 0.227 = 508,068 Gal/Year <br />0.1337 Ft <br />Evaporation = 58.9 In. X 150 Feet X 88 Feet X 1 Foct <br />Year 12 In. <br />X 1 Gallon 3 = 484,592 Gal/Year <br />0.1337 Ft <br />An excess of 23,476 gallons is conceiveable throughout <br />the period of one year. This amount, added to a 10-year, <br />24-hour event, will not result in a discharge. <br />Pond #2 <br />Total Storage Capacity (Gallons) _ <br />80 Ft. X 82 Ft. X 3 Ft. X 1 Gallon 3 = 147,195 Gallons <br />0.1337 Ft <br />Storage Required for a 10-Year, 24-Hour Event (Gallons) <br />= 3941 Ft3 X 2.47 Acre X 1 Gallon3 = 72,807 Gallons <br />Acre .1337 Ft <br />The above calculations show that Pond #2 can handle more <br />than twice the rainfall in a 10-year, 24-hour event. <br />• <br />