A high-speed digital computer was programed to obtain water-table recession in homogeneous tile-drained soil. Parameters considered were tile depth, spacing, barrier depth, hydraulic conductivity, and drainable pore space. Drain diameter was six inches. The midpoint water-table height was found to fall exponentially with time after a slower initial rate. Results presented graphically can be used for the rapid evaluation of the effectiveness of two drains. Tile spacing for any given surface drawdown rate can then be determined.
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John Isherwood (1959) studied this question.