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Fig. 1. Tile drainage system as set up in the RZWQM to emulate the design at the study site where z' = depth of drains,
= distance from the water table to the impermeable layer, m = water table height above the drains, d = distance from the drain to the impermeable layer, and L = distance between drains. Design is based on the Hooghoudt steady state equation to estimate the flux at the center of the drains and correct for two-dimensional flow.
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