Optimal Spacing in an Array of Fully Penetrating Ditches for Subsurface Drainage
Publication: Journal of Irrigation and Drainage Engineering
Volume 136, Issue 1
Abstract
A methodology for optimal spacing in an array of ditches fully penetrating into homogeneous and isotropic porous medium of finite depth over an impervious layer is presented. The cost function includes the depth-dependent earthwork cost and the capitalized cost of pumping of drain discharge. Essentially, it is a problem of minimization of a nonlinear objective function of single variable. The input variables consist of rainfall intensity, hydraulic conductivity of the porous medium, width and depth of ditches, earthwork cost, cost of pumps and pumping energy cost, efficiency of pumping unit, and rate of interest. Using nonlinear data fitting method an explicit equation has been proposed for computing the optimal spacing between the ditches.
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© 2010 ASCE.
History
Received: May 16, 2008
Accepted: May 28, 2009
Published online: May 30, 2009
Published in print: Jan 2010
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