690 SOILS: pbopjEBties and management 



probability of the occurrence of these in the eastern 

 United States is shown in the following table ^ of rainfall 

 records for the ten years from 1900 to 1909, inclusive : — 







NUMBEH OP 









FlPTEEN-DAY 



NtTMBER OP 





AVEEAGE 



Periods or 



Days when 



Station 



Annual 



OVER WITH 



Irrigation 





Rainfall 



LESS THAN 



WAS Re- 







1 INCH OF 



QtriRED (a) 







Rain 





Ames, Iowa 



30.39 



23 



190 



Oshkosh, Wisconsin . . . 



29.78 



27 



292 



Vineland, New Jersey . . . 



47.47 



46 



352 



Columbia, South Carolina 



47.55 



62 



568 



Selma, Alabama 



50.75 



60 



724 



(a) No days counted until after a fifteen-day period with less 

 than 1 inch of rain. 



The aggregate area of the projects is small and amounts 

 to only a few thousand acres. 



592. The Reclamation Service, — The financing of 

 irrigation enterprises by the Federal Government through 

 the Reclamation Service has been a wonderful stimulus. 

 The total number of acres on which ditches have been 

 constructed or are in process of construction in this way 

 aggregates 3,101,450, in thirty projects distributed through 

 seventeen states and involving a total expenditure of 

 hundreds of thousands of dollars. These projects contem- 

 plate the impounding of 13,272,490 acre-feet of water. 



^ Williams, M. B. PossibiHties and Need of Supplemental 

 Irrigation in the Humid Regions. U. S. D. A., Yearbook 1911, 

 pp. 309-320. 



Also, Teele, R. P. Irrigation in Humid Regions. American 

 Cyclopedia of Agriculture, p. 437. New York, 1905. 



