الفهرس 
CONTENTSOnly 14 pages are availabe for public view
 |  | from | 34 |  |  |
| | | from | 34 | | |
Abstract
Many situations arise in agricultural irrigation and drainge where it is desirable to evaluate the drainage system the subsurface drains are laid below the soil surface and are covered. They dont interfer with normal movement of farm implements and cultivation.