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prXV <br /> y " 5a m,f Wi-070 <br /> Ij <br /> CALCULATIONS OF NATURAL GROUNDWATER VELOCITY <br /> HOLT BROTH2RS <br /> 03/05/91 <br /> MONITORING WELL MW6 <br /> The natural velocity (VR)Of groundwater is calculated as follows: <br /> Vn = Ki/0 where K = T/b, Therefore Vn Ti/b0 <br /> Vn natural groundwater velocity <br /> K m hydraulic conductivity - Tb <br /> i a 0.001 - groundwater gradient <br /> C = estimated effective porosity = .30 <br /> b saturat000 ed/thickness�sl0vfty (from pumping test data) <br /> Vn 12,000 gpd/ft} (0.001) = 0.6662 <br /> (10 ft.) (0.30) gpd/ft _ <br /> 0.666 gpd/ft x 0.134 f#-/day x 365 days/yr. = 32 ft./yr. <br /> gpd/ft <br /> If a transmissivity of 200 gpd/ft representing the lower range of <br /> values determined from the pumping test is used, a groundwater <br /> velocity of 3.4 ft/year is calculated. <br /> a <br />