Water Resources and Environmental Hydraulics · Groundwater Resources · 2 marks · Multiple choice
Two isotropic homogeneous aquifer layers have thicknesses $h_1\ne h_2$ and horizontal conductivities $K_1,K_2$. Flow is parallel to stratification as shown. Find equivalent horizontal conductivity.
Both layers experience the same hydraulic gradient i. Per unit width, total discharge is $q=i(K_1h_1+K_2h_2)$. The equivalent layer has thickness $h_1+h_2$ and discharge $iK_x(h_1+h_2)$. Equating gives the thickness-weighted arithmetic mean in **A**.
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