Part 623 National E nginee ring Handb ook I rri g ation Wate r Requ irem ents Chapter 2 2 –1 (210-v i-NEH, Septem ber 1993 ) United States Department of Agriculture Soil Conservation Service Part 6 2 3 National Engineering Handbook Chap t er 2 Ir r iga t ion Water Requirements Use bookmarks and buttons to navigate document