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2. Optimum Depth and Spacing of Subsurface Drains
3. M. H. Amer, and M. S. Abdel-Dayem , 1987 . Drainage Design Practice and Project Implementation Procedures in Egypt . In: Proceedings Third International Workshop on Land Drainage. Ohio State University, Columbus, Ohio, pp.F9 -F17 .
4. spacing Drains to Maximize Revenue Increases
5. Subsurface Drainage Cost and Hydrologic Model