312 



Irrigation and Drainage 



1|! 1 1 HI III 



Fig. 71. Exposure of windmill which during one year pumped 79.1 

 acre-feet of water 12.85 feet high. 



It will frequently happen, also, that streams or rills whose 

 volume of water is too small to be used advantageously may be 

 dammed and the water accumulated in reservoirs, and used by 

 single individuals ; or two, three or more farmers may be located 

 so as to make it mutually desirable for them to unite their efforts 

 and take advantage of small streams in this way. So, too, may 

 the water of springs be led out to suitable places and accumulated 

 and warmed for use in irrigation. 



WIND POWER FOR IRRIGATION 



When relatively small areas of land are to be irrigated where 

 the lift is not greater than 10 to 25 feet, and where pumps may 

 be used of such forms and capacity as to economically utilize the 

 full power the mill is capable of developing, wind power may be 

 employed to good advantage in supplying water for irrigation. 



