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GYPSUM RANCH PIT <br />SEDIMENT POND CAPACITY CALCULATION <br />February 9, 2004 <br />1. Basin Area = 87.5 ac. <br />2. Precipitation Values <br />100 yr. 1 hr. = 2.4 in. from Exhibit G Drainage Report <br />3. Curve Number <br />85 from Exhibit G Drainage Report <br />4. Unit Peak Discharge <br />I, = 0.353 from Table 410 <br />5. Retention Pond 100 yr. Storage Volume <br />V,~ = 2.4 in. (87.5 ac. x 43,560) 0.353 =269,092 cf <br />12 <br />