CONTENTS 



PAGE 



Introduction •. 207 



Transpiration 207 



Water Losses 210 



Losses from canals and field laterals 211 



Evaporation from irrigated fields 212 



Seepage loss from irrigated fields 215 



Wilful or careless waste 220 



Efficiency of irrigation 221 



ILLUSTRATIONS 



PAGE 



An irrigation canal near Tempe Cover cut 



Fig. 1. Border irrigation from a ccmcnt-lincd ditch Frontispiece 



Fig. 2. Cleaning a canal with a giant "Vee" 209 



Fig. 3. Lining an irrigation ditch with concrete 212 



Fig. 4. Class A evaporation station 213 



Fig. 5. An orchard ruined by a rising water table 217 



Fig. 6. Cotton field with poor stand due to shallow water table 217 



Fig. 7. An alfalfa field, irrigated in corrugations 219 



Fig. 8. Diagram showing distribution of irrigation water into useful portion 



and various losses 221 



Fig. 9. Layout of an irrigated field for efficient irrigation 223 



