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Hydrology Results <br />. <br />P <br />i <br />k <br />h <br />ea <br />D <br />sc <br />arge <br />10-year, 24-hour event 7.87 cfs <br />25-year, 24-hour event 11.17 cfs <br />Runoff Volume <br />10-year, 24-hour event 0.64 ac-ft <br />25-year, 24-hour event 0.93 ac-ft <br />Sedimentology <br />Sedimentology - Methodology and Assumptions <br />Sediment yield was calculated using SEDCAD+ Version 3.0. The <br />methodology and assumptions used are outlined in the Pond 1 section of <br />this Exhibit. <br /> <br />Sedimentology - Inputs <br />All sedimentology inputs for each subwatershed are shown on Table 23D, <br />SEDCAD+ Version 3.0, Pond L2 and Perimeter Ditch. <br />Sedimentology - Results <br />A==(56.6/42.0)X(72.1 tons)X(2000 lb/ton)X(1/60 lb/ft,)X(1/43,560 ft,/ac- <br />ft) <br />= 0.08 ac-ft/year <br />Required Storage Caoacitv <br />Storage capacity = 10•year, 24-hour Runoff + sediment volume + dead <br />storage <br />= 0.64 ac-ft + 0.76 ac-ft <br />= 1.40 ac-ft <br /> <br />C~WORK\PRPE60dERfR1).RE~ <br />ai~3A7 e,m <br />179Ra <br />Revised - April 1993 <br />