DRAINAGE AND SALINITY PROBLEMS IN IRRIGATED AREAS, HOW TO AVOID OR MINIMIZE THEM

The report outlines the need for such drainage systems and describes procedures for thorough assessment of specific drainage and salinity problems. Preliminary investigations, field studies, the use of topographical maps and water and soil quality tests are described. The two major drainage methods, i.e., pumping from wells and the installation of open and/or closed drains, are also described. The report next outlines methods for reclaiming irrigated soils which have become overly saline or sodic due to inadequate drainage. Finally, the report enumerates criteria for estimating the cost/benefit of proposed irrigation projects in order to avoid those with potentially serious drainage problems. A glossary of terms used in the report is appended.