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Last modified
1/26/2010 12:28:41 PM
Creation date
10/11/2006 10:04:33 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
8271.300
Description
Colorado River Basin Salinity Control Program - General Information and Publications-Reports
Basin
Colorado Mainstem
Water Division
5
Date
6/1/1982
Title
Optimizing Salinity Control Strategies for the Upper Colorado River Basin
Water Supply Pro - Doc Type
Report/Study
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<br />... <br /> <br />its major tributaries are presented by Iorns et a1. (1965). Extreme precipi- <br />tation events are discussed ancl analyzed by Hansen et al. (1977). The extreme <br />cyclic natu1;e of the stresm.flowstypi.ca.l' to.~t:he.llas:l.nhaveneees.sit.ated la"ge <br />amounts of surface storage faoilities. <br /> <br />. <br /> <br />~ <br />I-" <br />CO <br />. Ul <br /> <br />Forty-two percent of the area of the Basin. receives less than 300 mm of <br />precipitation per year. These internal dElSerts contribut:e very little water <br />to the Coloraclo River Basin. . Figure 6 is an isrihy..tal map of the average <br />annual pcrecipitation in the Upper Coloraclo River Baein inclicating that approxi- <br />mately 10 percent Of the land 'erea o01'ltr:Lbutea about 85 percent . of the total <br />water 'supply. . . <br /> <br />Str eBmflow <br /> <br />The average annual 'ucordedflow.ofthe Upper Colorado River Basin at <br />tea's Ferry has ranged from e low of 6.90,500 ha--m in 1934 to II high of <br />2,960,700 ha-m in 1917. . Figure 7 pl:esents a map showing the relative stream <br />'volumeaancl their resp.ective aa1t load as a percentage of the average annual <br />tee's Ferry conditions. <br />.. . <br /> <br />1;" <br />(j) <br /> <br />The 1922 Colorado River Compact diviclecl"Water riglltabetween the t'pper <br />. ang Lo"Wer Basin based on an optimistic avarage annual virgin flo,,?f .1.'997 x <br />10 . ha'-m/yr. However, a part. of the Lake Powell Research Project (stockton <br />ancl Jacoby, 1976) esUmatecl the "long-tem annual virgin'rtlnoff" of the . <br />Colorado Rivar at tee's Feny ~to be 1.664.550 ha'-m/yr based on the analysis of <br />tree-ring data. From the analysis :of existiri.g hyclrologic data, Tipton ancl <br />Kalmback, Inc. (1965) estimated the ann\lal v;irgin flow at tee's.. Ferry.at <br />1,071,540 ha-m/yr. In comparison,da.ta published by,theU.S. Department of <br />the Intersor (USDI, BR. 1979a) inclicate an sctual observsd average flow of <br />1.~7 x 10 ha-m at tee's Ferry for the period of 1941-1978. . <br /> <br />The difference between virgin anclobserved flows ehoulcl ideally represent <br />the eonsumpt:l.ve use in the Upper Basin. Estimates of. oonsllIllptive use snd <br />water availability vary wicl~lY, The USDI (1974} .estimat:ecl the present deple- <br />tion to be about 4,562 xlO ha-m/yr, and ueing different ,!-ssUll\ptions, the <br />Westwicle Study (USD;.BR. 1975b) estimated the 1975 t?talconsumptive use to <br />be5about 3.946 x 10 ha-m/yr . The USDI estimatecl that. en average of 7.15x <br />10 ha-m of water is the total available water supply in the Basin, leaving <br />about 260,000 .ha-m for. future development. <br /> <br />.. . The most obvious conclusion which can be, derivecl from. the above data is <br />""":Ctha1:" there is little..wster fOrne"W deVelopment "Wiehout gonflictingwish <br />present use. The. USDI (1974)oalcu,latecl that 1..85 x 10.. .to 2.28 ,,10 ha- <br />mJyrofadll:l.tional wats. 'would be consumed for-nonen~gY~llses bY,' the J'esr <br />2000. Plotkin et a1.(1979) presentecl data which indicates thllt'j'U.st enargy <br />c1evelopment consumption by the year 2000 could be bet"Ween 74.000 ancl 136,000 <br />ha-m/yr. <br /> <br />. .' .,-. <br />" " '~-' . .'.. <br /> <br />f", <br /> <br />The Wl'RS developecl the "1976-Moclified Bass (1)" which states thst <br />1.158,030 he-m/yr water with a concentrat:l.on of 1,100 mg/l at Imperial Dam <br />depicts conclitions expected by 1900 (USDI, BR, 1979a). This "base" includes <br />existing observecl conclitions in 1976 plus effects of projects under <br /> <br />. <br /> <br />18 <br /> <br />.. <br />
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