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Vadose Zone Model <br /> i� <br />' AS 4 Dispersion <br /> ' The dispersion coefficient is assumed to be a linear function of the seepage velocity, <br /> v, (defined in Equation A-27) <br /> D = a, v 0 (A-32) <br /> 100cm <br /> ' where <br /> aL J longitudinal dlspersivity [m] <br /> The longitudinal dispersivity is calculated using data from Gelhar et at (1985) as a <br /> function of the vertical distance from the source <br /> ' Ina, =—4 933+ 3 81 l In xm x,, C 2m (A-33a) <br /> ' In a� =—2 727 +0 584 In x,,, x,,, >_ 2m (A-33b) <br /> where <br /> x,,, = distance from the source to the observation location [m] <br /> .J��SMT n d F.�.rax���li ����1►�pz, r� �.x,k��$�a� 1a t. 'Xr'0�°r.. ^* <br /> ' The data required to run the Vadose Zone model are shown to Table A-1 <br /> 1 <br /> t A-19 <br /> 1 <br />