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14 November 2014 <br /> AGE Project No . 07-1529 <br /> Page 2 of 2 <br /> • Seepage velocity (groundwater velocity) was calculated using the following <br /> formula: <br /> Vs = V/n <br /> V = Darcy velocity <br /> n : porosity of sand (35% or 0.35) <br /> Calculations for rate of flow (seepage velocity) through shallow zone aquifer.• <br /> 1 : Cross-sectional area : A= 9 . 5 ft( 150)( 176 ft) <br /> A = 250 , 800 ft2 <br /> 2: Hydraulic gradient: A = 0. 006 ft/ft <br /> 3: Rate of flow for hydraulic conductivity = 10 gpd/ft2 <br /> Q = (K) (i) A <br /> Q = 10 gpd/ft2(0 , 006 ft/ft) (250, 800 ft2) <br /> Q = 15 ,480 ft3/day <br /> 4 : Darcy velocity: V = Q/A <br /> V = 15,480 ft3/day/250 , 800 ft2 <br /> V = 0 .06 ft/day <br /> 5 : Seepage velocity : Vs = V/n <br /> VS = 0 . 06/0 . 35 <br /> V5 = 0 . 17 ft/day <br />