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WSP11823
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Last modified
1/26/2010 3:18:59 PM
Creation date
10/12/2006 5:11:51 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8281.400
Description
Colorado River Studies and Investigations -- Colorado River Depletion Projections
Basin
Colorado Mainstem
Water Division
5
Date
3/25/1955
Title
Report on Depletion of Surface Water Supplied of Colorado West of Continental Divide
Water Supply Pro - Doc Type
Report/Study
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<br /> <br />I <br /> <br />. <br /> <br />of such land. Preston did not map the areas which he deemed it <br />would be impracticable to serve but his survey does show net irrigable <br />land in class 1 and class 2 in the amount of 85,200 acres within the <br />same fl,rea covered by the Cliffs-Divide projects and the Silt and <br />Collbrlj,n projects. <br />(b) ]n the case of the surveys in the Gunnison River Basin the net <br />irrigabte area found by Preston was about 77,000 acres. Subsequent <br />and m{Jre detailed' surveys covering all potential projects in the <br />Gunnison River Basin show only 61,000 acres of class 1 and class 2 <br />land which could be served. <br />Hence, any areas omitted by Preston within these classifications are <br />presumptively those lands which could not be included within the <br />area of new projects even under very liberal standards. The great <br />discrepa(ncy which exists between the total of allirrigable areas found <br />by Preston and those reported more recently arises from the inclusion <br />in these.subsequent surveys of class 4 lands which were not mapped <br />by Preston. In the case of the main stem of Colorado River, the <br />recent in,ventory surveys show a total of 250,000 acres of class 4 land, <br />as compared to 121,000 acres of class land class 2 land, the ratio <br />being a Uttle more than 2 to 1. Recent surveys do not cover all ofthe <br />Gunnison River Basin but out of a total of 216,000 acres it was found <br />that there were 147,000 acres of class 4 land not now irrigated, slightly <br />in excess 'of two-thirds of the total. <br />Recon:Q.aissance of the areas mapped by Preston which are not <br />covered by more recent land classification surveys leads us to believe <br />that the areas of class 1 land and class 2 land reported by Preston <br />may be accepted as reasonable. It was. also apparent from general <br />observation that it is reasonable to allow substantially 2 acres of <br />class 4 land for each acre of class 1 and class 2 land which Preston <br />classified i5 years ago. Actual surveys would probably disclose some- <br />what smaller areas, but the difference would not be material in any <br />determination of the eventual depletion of water by irrigation agri- <br />culture on! the western slope of Colorado. <br /> <br />Summary 'of irrigable areas <br />In the following tabulation there are given the irrigable areas not <br />now irrigated, under different classifications, based on the most recent <br />information available. For those tributary basins where the Preston <br />survey is the only one, an arbitrary allowance has been made for <br />class 4 land consistent with what was found elsewhere: <br /> <br />DEPLETION OF SURFACE WATER SUPPLIES <br /> <br />o <br />'.:J <br />W <br />""*' <br />C,) <br />~ <br /> <br />Irrigable I and not now irrigated <br />(Quantities in acres] <br /> <br />Goo~rapblc divisIon <br /> <br />Class 4 and <br />miscellaneous <br /> <br />Class 1 <br /> <br />01aS82 <br /> <br />Gre\n River Bas1J:L~ _~____~~____~_____~_.______ <br />Colorado River/main stem_____________________ <br />Gunnison River Basin__~__________~_M_________ <br />Dolores River Bask and lower San Juan River <br />tributarieS. _ _ _ _ ~,_ _ _ _ h_ _ _ _h _ _ _ _._ _ _ _ _ __ ~ _ ___ <br />San Juan River Bilsln above Sbiprock~__~_~_~_ <br /> <br />TotaL ~. ~ ~ ~ ~ _ _ ~ ~ __. _ ~ ~. __ ~ ~. ~ __ _ ~ _ __ _ _ ~ ~ ~ <br /> <br />21.300 <br />3,600 <br />1,400 <br /> <br />205. 400 450, 000 <br />Jl7.800 251,000 <br />67,200 160,000 <br /> <br />16,900 <br />6,400 <br />49,600 <br /> <br />127,000 288,000 <br />71,700 156,000 <br />--~- <br />689, 100 1. 305, 000 <br /> <br />13 <br /> <br /> <br />,'" <br /> <br /> <br />~~, <br /> <br />;. <br /> <br />~~, . <br />'. <br /> <br />Total <br /> <br />~. <br /> <br />;. <br />, .' <br /> <br />676. 700 <br />372,400 <br />228. 600 <br />431,900 <br />234,100 <br /> <br />1, 943j 700 <br /> <br /> <br />" <br /> <br />I <br />
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