WSP08670

• File Number: 8270.100
• Description: Colorado River Basin Water Quality/Salinity -- Misc Water Quality
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 1/7/1974
• Title: Status Report - Grand Valley Unit - Colorado River Water Quality Improvement Program
• Water Supply Pro - Doc Type: Report/Study

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Studies were m~<.1c on the convcy.ailce cCi}JcJci.Lic.s oi Lh~ &;y&tc~s u.::.[.;..;~ ~~"i

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c~ploying the Jennen-Haise forculD, cropping
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efficiency, nnd clioatic data for thc valley.

Irri-

crop consumptive usc

patterns, increased

g&ticn efficiencies were determined on study formn in conjunction with

the study of Use of Water on Federal Irrigation Projects during the

period 1964 to 1963. Thin study Bho~cd an overall season~l irrigation

effi~iency of 32.6 percent. 1110 highest observed efficiency was 89 pcr-

cent, though only 2.11 8cre-inch~s were applied. Most of the high

efficioncy irrigBtion did not c~pletcly sBturate the soil, resulting in

shorter irrigution intervals. Water ucer organizations in the valley

Dl'C very adm;;ilnt that the canal cupncl. tics aot be reduced helo,", lho~e they

have at the ~esent time. The capacities Dl'rivcd at by the Jensen-Haise

foeroula were close to the exiBting capacites, so the cont cstimate3 were

made using the present 'capacities.

Agricultural lnnd use ourveys have been conducted by the Bureau of ~ecla-

nation for part of the Grand Valley when the Grand Valley Project was being

wilt in the e;:.:;ly 1900's. Crop census is tulccn on the Grand Vlllley Project

annually. In 1969 the A~icultural engineering Department, Colo~;:.Jo State

University collected field data for an acricultural l~nd use ourvey of

the entire Grand Valley. This survey included a breakdown of the various

agricultural crops, munLeipal ~nd indu~trial useD, open wator surfaces,

phreatophytes, c:ld areas receiving only precipitation. This bl'e~l,dcwn

is cs~ential in establishing the potentt~l consU'.:lptive uoe for the hydrologic

crea. In 1973 the Bu~~~u of RcelsmatLon conducted a' l~nd use survey to

co~p~te consumptive uce end loc&eo in the Grand Valley. This Gurvey W3C

an ur-:latc of the Coler.ode Ztate Univn'~ity's 1969 Gurv~y.

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