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SFUTR <br /> 9,MIRp . <br /> : b <br /> y <br /> 4 <br /> 1.0 CALCULATION OF SOIL PERMEABILITY (k) USING SEMILOG APPROACH <br /> ~ Usingthe <br /> approximation of Bear (1979): <br /> P= <br /> O [-0.5772-1n (r_tow ' <br /> 47rb(kj ) 4kPA Equation I <br /> where, <br /> P pressure at radius r; <br /> rw M .b <br /> � f <br /> flow rate <br /> µ - viscosity <br /> - porosity (vapor filled) <br /> P„ - atmospheric pressure <br /> r t n time <br /> b - screen interval <br /> The above equation is valid for: ; <br /> - - i <br /> wa <br /> z <br /> 4 <.� Equation 2 <br /> Therefore; the slope of the semilog plot (m) is: <br /> 2.30 <br /> 4rrb(k/p, <br /> Using the data from the constant rate test of well VP-2 and <br /> -the semilcg straight line slope from observation well VP-1 on <br /> Figure 4: <br /> i <br /> k=2.6.10 CM2=jj0dar(_,5 j <br /> where: Q - 85 cfm <br /> b - 25 ft <br /> g/rm-s <br /> m - 685 g/cm-sr <br /> n the left hand side of Equation 2 is less than .001 steady <br /> stuLL� is achieved (Hear, 1979). Using Equation 2 and the data <br /> above - <br /> uraasta..,y , <br /> i , <br /> � j <br />