You may want to read the FAO ...
Published by Benjamin Briere de l'Isle
You may want to read the FAO Paper 56 on Irrigation and drainage http://www.fao.org/docrep/x0490e/x0490e00.htm
Published by Benjamin Briere de l'Isle
You may want to read the FAO Paper 56 on Irrigation and drainage http://www.fao.org/docrep/x0490e/x0490e00.htm