AETESIAU WELLS. 417 



Observations at Cherry Creek' during the period from June to 

 November, inclusive, 1889, gave as the evaporation — 



For June 8. 1 



July 7.9 



August 3.6 



September u. l' 



iber 1.2 



November 2.5 



Total 



The monthly percentage <>!' the yearly evaporation al Denver is 

 approximately — 



Pi i cent 



For January 1 



I ebi nary 5 



Marcb 7 



April g 



May 10 



June 15 



July 12 



August 1 2 



September !i 



1 ictober 7 



November 6 



i ■ cember 5 



Combining in ;i proportion tin- total percentage for the months June to 

 November and the actual evaporation as observed al Cherry < !reek for this 

 period, the result for tin- year is the 61 inches given above. 



In general, in considerations of the present nature, it is customary to 

 allow for evaporation about one-third of the rainfall. Fur convenience in 

 subsequent calculations, it will in this report be taken at i indies, or a little 

 under one-third. 



The run-off and evaporation for the Denver Basiu — 1.113 inches and 

 4 inches, respectively — leave of the annual rainfall of 14.113 indie-, i; 

 inches available for absorption by the strata upon which it falls. 



WATER AVAILABLE FOR ABSORPTION. 



From rainfall direct. Tile ;ll'e;i ill' expnslll'e of tile ]u\Ver \Y» ter-1 )(•;! H Og 



series — the Fox Hills sandstone, the basal sandstones of the Laramie, and 



Eleventh Ann. Sept. U. S. Geol. Survey, Pari 11. Irrigation, p. Ml. 

 MOM XXVII 27 



