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Calculate Underdrain System Discharge:

(Note: All input Metric units are converted to English units for the equations below and then the output English units are converted back to Metric)
Underdrain lateral spacing (S - ft or m)
Length of the underdrain (L - ft or m)
Recovery time of the system (t - hr)
Depth from the natural ground elevation to the water table (c - ft or m)
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Drainage coefficient, q =
Discharge, Qr=

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