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An accounting system for estimating and dtstnbuttng consumptive use of water by vegetation to water users was developed for the Colorado Rtver from Hoover Dam to Mextco The accounting system IS based on a water-budget method to estimate total consumptive use by vegetation from Hoover Dam to Morelos Dam Consumptive use by vegetation ts apportioned to agncultural users by using percentages of total evapotranspiration by vegetation estimated for each dtverter of water Evapotranspiration for each dtverter IS estimated from ( 1) digital-Image analysis of data from the Landsat satellite to determine vegetation types and areas for each diverter and (2) water-use rates to determine the quantity of water used by each vegetation type Evapotranspiration IS estimated for each of four reaches of the nver-Hoover Dam to Davis Dam, Davts Dam to Parker Dam, Parker Dam to lmpenal Dam, and Impenal Dam to Morelos Dam--to Incorporate spatial vanattons tn the weather data used to calculate water-use rates The Lower Colorado Rtver Accounting System was used to esttmate and dtstnbute consumptive use by vegetation In calendar year 1984, consumptive use by vegetation was 2,069,900 acre-feet. About 4,283,200 acre-feet of water was exported to Cahfomta, 391,400 acre-feet was dtverted to the Wellton-Mohawk area 1n An zona, 1 ,3 58, 1 00 acre-feet was used for agnculture In the flood platn of the Colorado Rtver, 1,055,800 acre-feet was transpired by phreatophytes or evaporated from open-water surfaces along the nver, and 40,600 acre-feet was consumed by domestic and muntctpal users 10 and adJacent to the flood plain Total water loss from the Colorado Rtver tn the Untted States below Hoover Dam dunng 1984 was about 7, 129, 1 00 acre-feet About 18 percent was consumptively used In Anzona, 67 percent In Cahfomta, less than 1 percent In Nevada, and about 15 percent was used by phreatophytes or evaporated from open-water surfaces The accounting system produced reliable (less than 1 percent difference from the previous method) results for 1984 when, because of an unusually large quantity of flow In the nver, the computed consumptive use by vegetation was less precise than anticipated On the basts of the analysts for 1984, the accounting system should yteld accurate estimates of consumptive use by agncultural users for all years To Improve the estimate of consumptive use by vegetation, errors In computed flow at the mainstream gages should be further reduced More accurate computation of discharge at the maJor dams along the Colorado Rtver wtll also facthtate the use of water budgets for subreaches of the nver to refine the estimates of consumptive use by vegetation along the nver Water-use rates for vegetation types that more accurately reflect spatial and temporal vanabihty of evapotranspiration need to be developed to Improve the distnbution of consumpttve use by vegetation, the Identification of mtnor crops and multiple-cropped areas also needs to be Improved

An accounting system for water and consumptive use along the Colorado River, Hoover Dam to Mexico