140 AGRICULTURAL ENGINEERING 



QUESTIONS 



1. What is meant by humid, semiarid, and arid regions? 



2. Why is irrigation profitable in humid regions? 



3. How have experiments proven that yields may be increased in 

 humid regions? 



4. Does irrigation furnish a satisfactory means of disposing of 

 sewage water? 



5. What crops can be profitably grown with sewage irrigation? 



REFERENCE TEXTS 



Irrigation Engineering, by H. M. Wilson. 



Irrigation and Drainage, by F. H. King. 



Irrigation Institutions, by Dr. Elwood Meade. 



Irrigation Farming, by L. Wilcox. 



Primer of Irrigation, by D. H. Anderson. 



Bulletins of the United States Department of Agriculture. 



