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<br /> <br />b. Determine 10-yr., 24-hr. Precipitation (P,o) <br />i P,o = 1.6 in. (Ref. NOAA Atlas 2, Vol. III) <br />c. Total Runoff (Q,o) <br />Q,o = 0.14 in. (Ref. Peak Flows in Colorado, p. 52) <br />d. Calculate Total Volume (V,o) <br />V,o = 0.14 in. X 1 ft. X 91.6 acres <br />12 in. <br />V,o = 1.07 ac.-ft. <br />(46,683 ft.') <br />2. Sediment Volume (VS) <br />Universal Soil Loss Equation (LISLE) <br />A=RKLSCP R=30 C=0.10 <br />K = 0.39 P = 0.50 <br />LS= 0.47 <br /> <br />A = (30) (0.39) (0.47) (0.10) (0.50) <br />A = 0.275 tons/acre-year <br />Calculate VS based on 3 years sediment storage <br />Assume: Bulk Density = 80 lbs./ft.' <br />VS = 91.6 ac. X 0.275 tonslac-yr x 3 yr. x 2000 Ibs/ton <br />80 Ib/ft.' <br />VS -= 1889 ft.' (= 0.043 ac-ft) <br />. Minimum Pond volume = VS + V,o = 1.11 ac-ft (48,352 ft.') <br />u <br />Revised May 1998 <br />