Abstract: A least-squares land-leveling program written for use on microcomputers allows flexibility in design that was not previously available. The user can specify six different types of land-leveling conditions common under ...

Abstract: Field data of water‐table depth fluctuations under cotton grown in Egypt arc used to relate water‐table depth frequency of occurrence to yield. Daily water‐table levels are measured. A multiple linear regression analysis ...

Abstract: A simple method called “upward infiltration method” is described for using common soil laboratory equipment to measure unsaturated hydraulic conductivity of soil samples in a short time. The method is based on measurement ...

Abstract: The slope of the soil surface has a significant effect on water distribution from sprinklers. Field tests were conducted to quantify the effects. A ballistic trajectory model was developed to simulate precipitation data ...

Abstract: Subsurface drainage systems installed in soil overlying artesian aquifers should be spaced to handle both upward artesian water flow and normal downward seepage flow from irrigation and rainfall. Proper drain spacing depends ...

Abstract: Drainage design for water quality management in irrigated areas requires use of hydrodynamic models that delineate flow paths of subsurface water moving to drains. Use of only traditional drainage design equations for ...