Drawdown Solutions for Simultaneous Drainage and ET

by R. Wayne Skaggs, Assoc. Prof.; Dept. of Biological and Agricultural Engrg., North Carolina State Univ., Raleigh, N. C.,

Serial Information: Journal of the Irrigation and Drainage Division, 1975, Vol. 101, Issue 4, Pg. 279-291

Document Type: Journal Paper


Numerical methods were used to solve the nonlinear Boussinesq equation for water table drawdown between parallel drains. The solutions were compared to other methods of predicting drawdown for initially horizontal, parabolic, and elliptical profiles and good agreement was found with methods that considered the nonlinear aspects of the governing equation. Solutions were presented in graphical form for simultaneous drainage and ET or deep seepage. Example problems were solved to show the use of these solutions for evaluating the effect of ET or deep seepage on water table drawdown and for considering this effect when predicting drain spacings to satisfy a predetermined drawdown rate. The solutions were also used in an example to explain apparent discrepancies in field tests of drain spacing equations.

Subject Headings: Drawdown (hydrology) | Drainage | Numerical methods | Nonlinear analysis | Water table | Seepage | Spacing | Field tests

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