الفهرس 
AcknowledgmentOnly 14 pages are availabe for public view
 |  | from | 144 |  |  |
| | | from | 144 | | |
Abstract
Fertility of the agricultural soil is regarded as the most precious resources of naturalwealth.InEgypttheagricultural development depends on the vertical and horizontal expansion. In generalraising the rate of agriculturalprodu~tionofthe already cultivated lands is morebenefitable than relative expansion in the cultivatedarea, sincereclamation of new land needs many years to bringup itsrateofproductiontotheproperstandard. Toincrease the landproductivity andkeep its fertility, a suitableadequatesystem of drainage must bechosen.Theidealdrainagesystemisthesystem which secures the maximumbenefitwith aminimum overall cost. The obj ecti ve of this study is to develop a solution for the problem of drainingatoppervious layer underlaid by aninclinedimpervious substratum using a system of tiledrains Fig. (1-1). In this study a reviewofthe existing theories and experimentalworks forthedesignofsubsurfacedrainsispresented.The mathematical treatment is based on theactualflownetandtheproperboundary conditions.Thetheoryofcomplexfunctions, and thetheoryofimagesareusedtoestablish thecomplexpotential,thevelocitypotentialand~bestreamfunction.Theoreticaldischarge formulas are also obtained.Acomputerprogramme is madetocalculate the theoretical