This work has been Undertaken under the supervision of Dr. Abdullah Arar, Senior Regional Officer, Land and Water Development Division, FAO. His continual support and careful attention to the details involved in producing a document such as this are very much appreciated. Numerous other staff of the FAO have also contributed to this work through their reviews, editorial oversight, and publication.
In the last decade or so, the methodology of surface irrigation engineering has moved from the empirical to the quantitative. This has been accomplished by the concerted efforts of numerous researchers and practitioners, some of whom are acknowledged in the REFERENCES. However, many others have made substantial contributions. Of these, perhaps the graduate students at the universities where surface irrigation technology has been extended have been the most unheralded. To those who have worked with the author, special thanks.