Laserfiche WebLink
. W = 40(0.6) + 72(0.3) + 97(0.1) = 55.3 lbs/ft3 <br />.'. Vs = 4.62x2,000 = 0.004 AC.Ft <br />55.3x43,560 YR.AC <br />Then Vs = (3)(0.004)(2.4) = 0.03 AC-Ft for 3 yrs <br />Total Volume req'd = water + sediment <br />= 0.17 + 0.03 <br />= 0.20 AC. Ft <br />Emergency Spillway: <br />Direct Runoff 25 yr = 1.11" <br />for 3% slopes <br />Q25yr = (1.11)(4.5)(0.93) = 4.7 CFS <br />The spillway is sized to handle the peak flow = 4.7 <br />1 - 18" CMP flowing full will carry = 5 CFS <br />use 1-18" CMP for spillway <br />Sanitary Landfill <br />• Drainage = 4.9 AC. Ft - Represents the landfill inself and the <br />undiverted natural area. All of the 4.9 acres are assumed to be <br />disturbed with CN = 89. <br />Volume 10 yr = (4.9)(0.86/12) = 0.35 AC.Ft of water <br />Sediment Volume <br />The same values are used as for the explosives storage area, <br />.'. Vs = 0.004 AC. Ft <br />YR. AC <br />for 4.9 AC, Vs = (0.004)(3)(4.9) = 0.06 AC. Ft <br />Total Req'd vol. = Water + Sediment <br />= 0.35 + 0.06 = 0.41 AC. Ft <br />Emergency Spillway <br />Direct Runoff 25 yr = 1.11" <br />for 4% slopes <br />Q 25 yr = (1.11)(7.8) = 8.7 CFS <br />1 - 24" ~ CMP flows = 10 CFS when full <br />Use 1-24" CMP <br /> <br />