What is the “Starting Elevation” on the Well Properties Other tab?
Since WhAEM traces pathlines in three-dimensions, a Starting Elevation must be defined for each pathline trace. It is recommended that for capture zone delineation you set the Starting Elevation equal to the aquifer bottom. In this manner the pathline trace will remain along the aquifer bottom, providing for the largest capture zone. Higher Starting Elevations may result in shorter pathlines as a (hypothetical) water particle is back traced in time to the point where it entered the aquifer at the water table (or aquifer top). Remember that in a Dupuit-Forchheimer model, like WhAEM, partially penetrating wells are treated as fully penetrating. Consequently, you can define a Starting Elevation at the aquifer bottom even though in reality the well screen may not reach that deep.
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