IREIGATION m NORTHEEK COLORADO. 



normal run-off and 25,000 acre- feet as returned seepage. The greater 

 part of this flow is intercepted by canals and reservoirs before it 

 reaches the river. 



The foreign water turned into the Cache la Poudre River has 

 averaged 35,000 acre-feet for a number of years. The Grand River 

 ditches of the Water 

 Supply & Storage 

 Co. bring over about 

 11,500 acre-feet 

 from the Grand 

 River drainage area. 

 Ditches of the 

 Water Supply & 

 Storage Co. and the 

 North Poudre Irri- 

 gation Co. draw 

 about 3,500 acre- 

 feet from the Mich- 

 igan River drainage 

 area. The remain- 

 der, 20,000 acre- 

 feet, is brought 

 over from the La- 

 ramie River drain- 

 age area by the 

 Skyline Ditch of 

 the Water Supply 

 & Storage Co., the 

 Greeley-Poudre ir- 

 rigation district's 

 tunnel, the Sand 

 Creek feeder of the 

 Worster Reservoir, 

 and others. The 

 greater part of this 

 foreign water is 

 diverted by the 

 North Poudre Val- 

 ley, and the Larimer County Canals. The Greeley-Poudre district, 

 having no land under irrigation, usually sells the tunnel water to 

 the highest bidder. The record of discharge of the river at the 

 canyon rating station includes all foreign water passing that point. 



The amount of water obtained by pumping from wells does not 

 exceed 5,000 acre-feet annually and is generally used late in the 





APRIL 

 10 20 



MAY 

 10 20 



JUNE 

 10 20 



JULY 

 10 20 



AUGUST 

 10 20 



SEPT. . 

 10 20 



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Fig. 2. — Discharge of the Cache la Poudre River at the rat- 

 ing station at the mouth of the canyon during the period of 

 the investigation compared with the average for approxi- 

 mately 35 years. 



