The subscript i,j-1/2,k is used in equation 2–3 to designate the region between nodes i,j-1,k and i,j,k. The “1/2” does not indicate a specific point half way between nodes. Thus, qi,j-1/2,k indicates that the flow from node i,j-1,k to node i,j,k, ∆rj-1/2 is the distance between nodes i,j,k and i,j-1/2,k, and KR i,j-1/2,k is the effective hydraulic conductivity between the nodes. The term “1/2” is used in the same manner to indicate the region between nodes in many of the equations throughout this report.
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