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WSP04073
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Last modified
1/26/2010 12:53:36 PM
Creation date
10/12/2006 12:06:47 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8141
Description
Fryingpan-Arkansas Project
State
CO
Basin
Arkansas
Water Division
5
Date
3/6/1952
Author
Commissioner BoR
Title
Report and Letter requesting Comments of the State and Official Comments of the State
Water Supply Pro - Doc Type
Report/Study
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<br />/ <br /> <br />3303 <br />FRYINGPAN-ARKANSAS PROJECT, COLORADO <br /> <br />7 <br /> <br />create a risk i,i meeting the Lee Ferry obligation of the Colorado <br />River compact. <br />18. Irrigation.-The main agricultural part of the eastern slope <br />project area is in the semiarid zone of 11 to 16 inches of annuill pre- <br />cipitation. Seycnty to eighty-six percent falls during the April to <br />October growing season. Dry funning is and probably will continue <br />to be practiced extensively. Livestock grazing on the ranges and in <br />the forests is also an extensive enterprise. However, bot.h t.ypes of <br />ugrjrult.ure require large land areas, and dry fanning particularly <br />depends upon the vagaries of the weather. General cultivated agri- <br />culture and specialty high-value crops, many of which are required to <br />st.abilize the agricultural economy of the area, require more wa ter <br />than typical dryland crops. Irrigation is the only means of providing <br />a (lependahle supply, <br />19. Earlv irrigation in the Arkansas Valley coincided with available <br />Rt.renm run--off. As retHl~T markets developed.. irrigat.ion fUl'lning WllS <br />expanded and a demand developed for late season water which conld <br />not be supplied by unregulated streamflow. Consequent.ly, between <br />1890 and 1910. thrl~e reservoirs in the headwaters area and 11 off- <br />st,ream reservoirs below Pueblo wel'e constructed. In 1949 (,he ,John <br />Martin Reservoir on the Arkansas River was completed by the Corps <br />of Engineers for conservat.ion storage and flood control. It also has <br />an irrigation storage space of 420,000 acre-feet. The trluee headwat.ers <br />reservoirs have a capacity of 84,400 acre-feet. The 11 off-stream <br />]'pservoirs have n present capncity of 300,000 acre-feet which repre- <br />sents about 75 percent of the original capacity o,s a consequence of <br />se.dimentation. Eight privately owned tran.smountl1in diversion sys- <br />teIllS import about 48,000 acre-feet annually. <br />20. )\{ore t.han 40 canals and ditches supply irrigat.ion water to lands <br />in the ,-alley bet,\'een Canon City and the Colorado-Kansas boundary, <br />Sediment deposition in ennals and ditches has become a major irrigation <br />problem in the Pueblo-Las Animas reach. In some inst.ances long <br />reservoir feeder canals have lost 50 percent of tbeir cnpllcity because <br />of sellimentation. <br />21. The alllount of irrigat.ion water available for the 322,000 acres <br />of irrigil.t,eu land in the project area varies cOll.Siderably froIn year to <br />year. Seldom is the supply odequn,te for Inaxillluffi crop production. <br />Irrigation water shortages as high as 78 percent of crop requirements <br />have occurred. The estimnted average canal headgl1te diversion re- <br />quil'ement is 3.19 acre-feet an acrc. Allowing fot' tolerable shortages <br />that. hendgate requirement. can be reduced to 3.10 acre-feet.. Th~ <br />average amount of seasoIlal irrigation water historically available <br />bet.ween Pueblo and the Knnsas State line has ranged from 0.9 acre- <br />feet an aerein 1934 to 2.7 acre-feet in 1942. The base flow of every <br />81.1" in the valley is o\"erappropriated. Enhancement of the irri- <br />ga ':'\Vflter supply depends UPOIl regulation of existing supplies for <br />Il1D "Jfll'.ient. use, ndditionnl storagl} capacity for the conservil.tion <br />of exce5S flood flows, reservoir space for holdo'\cr storage, and new <br />"~at.cr supplies for which the only I1pparellt SOurce is trausmountain <br />diversion from the Qj!l telo River drainage. <br />. 22. Powcr,-Powe <. ilities of the initial development will he de- <br />Signed for inteO"rntio _ with the- power facilities of the Bureau's Colo- <br />rauo-Big Tbol~pson proiect llnd with local utilities to serve u. com- <br />bined power market area. The combined area, which cOllsists -of t.llC <br /> <br />..a'~".' <br />t~yi~ ,~~,. <br />
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