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1 COMPUTATION SHEET <br /> 1 PROJECT TITLE: Harney Lane Sanitary Landfill PROJECT NO. 939-01.11 <br /> DESCRIPTION: Ground-water Flow Velocity SHEET 2 OF 2 <br /> PREP. BY: M Capps DATE: 8/31/92 CHKD BY: DATE: <br /> 1 <br /> Darcy's Law was used to calculate the ground water flow velocity <br /> 1 <br /> V = Ki / n <br /> 1 <br /> Where: V =Average linear velocity <br /> 1 K= Hydraulic conductivity <br /> i = Hydraulic gradient <br /> n = Porosity <br /> 1 The values used to solve the equation are as follows: <br /> 1 * K = 0.00900 <br /> i = difference in elevation between contours/horizontal distance between contours <br /> ** n = 0.3 <br /> * K value based on measurements taken at the site <br /> ** n value based on laboratory porosity measurements of samples collected from the water-bearing zone <br /> 1 The ground-water flow velocity was calculated between the -21 and-31 foot contour lines as follows: <br /> 1 Contour lines: -21 <br /> -31 <br /> Difference in elevation <br /> 1 between contours: 10 <br /> 1 Horizontal distance between lines: 2450 <br /> i= 0.0041 <br /> 1 V = 0.000122 centimeters per second <br /> 1 V = 126.78 feet per year <br /> 1 <br /> 1 <br /> me/h:HL3Qv <br /> 1 <br />