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Last modified
1/26/2010 12:49:40 PM
Creation date
10/11/2006 11:39:09 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
8281.300
Description
Colorado River Studies and Investigations - Colorado River Consumptive Uses and Losses Report
Basin
Colorado Mainstem
Water Division
5
Date
1/1/1984
Title
Colorado River System Consumptive Uses and Losses Report 1976 - 1980
Water Supply Pro - Doc Type
Report/Study
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<br />table UC-l. Predetermined average <br />evaporation ,rates were applied to <br />~ historical ~urface areas to yield <br />(d values of evaporation on a monthly <br />W basis. <br />..... Adequate data exist to allow a <br />tn reasonably accurate estimate of the <br />Q basin evaporation. Both an increase <br />in the number. of evaporation stations <br />and a better estimate of the surface <br />area of the un~easured reservoirs would <br />improve the evaporation calculations. <br /> <br />Stockpond Ev~poration and Livestock: <br />Stockpond surface areas were estimated <br />from the May 1975 SCS publication, <br />"Livestock Wat:er Use." The subbasin <br />stockpond areas were subdivided by <br />State and basin using the livestock <br />popu lat ion d~stribut ion. The same <br />procedure used, to calculate the unmea- <br />sured reservoit evaporation was used to <br />estimate the ~tockpond evaporation. <br />Livestockpopu~ation data were <br />taken from annual State Agriculture <br />Statistics and the 1978 Census of <br />Agriculture. Livestock population <br />data included cattle, sheep, horses, <br />hogs, and pigs, Consumption rates for <br />the various livestock were derived from <br />various reports, including the SCS <br />publication, "Livestock Water Use," <br />May 1975. <br />Stockpond and livestock data are <br />adequate to prepare an estimate of this <br />use. Considering the small amount of <br />water use, any refining effort would be <br />best spent on the irrigation or evap- <br />oration categories. <br /> <br />Mineral Resources: Arizona, leads the <br />nation in the production of copper and <br />the net water use for its production <br />represents abo.ut 90 percent of the <br />total water use for mineral resources <br />in the Lower Basin. The Upper Basin <br />uses water in the producti'on of numer- <br />ous minerals in addition to energy- <br />related materials such as oil and <br />natural gas. <br />Estimates of the water consumptively <br />used were based largely on current <br />and previous reports of the Bureau of <br />,Mines. These reports include the gross <br /> <br />tonnage produced and the water consumed <br />per ton of production. <br />The Bureau of Mines data should <br />be quite adequate; however, in some <br />cases, important production data was <br />withheld for privacy reasons. In these <br />instances, earlier reports and the <br />comprehensive framework study were used <br />to estimate the water use. <br />Information regarding the annual <br />use of water by the mineral resource <br />industry was generally inadequate. <br />Information over 10 years old was the <br />best available for certain mineral <br />production and unit water quantity <br />requirements and the accuracy of such <br />information may be in doubt. Much of' <br />the data was riot listed by county, <br />Which caused difficulty indisaggre- <br />gating the data into tributary areas; <br /> <br />The,mal Electric Power: The net use of <br />water for the produc t ion of thermal <br />electric energy from the tributaries of <br />the Colorado River Basin was estimated <br />from records obtained from the various <br />power companies in the Bas in. These <br />records were complete and were judged <br />to be accurate. <br /> <br />Municipal and Industrial: The basis <br />for estimating municipal and industrial <br />uses was the urban and rural population <br />within the reporting areas. Prepara- <br />tion of annual population estimates was <br />guided by the 1970 and 1980 censuses, <br />various State and county statistical <br />reviews, and reports which included <br />population estimates for local areas. <br />The yearly population estimates for <br />the Upper and Lower Basins are shown <br />in tables UC-8 and LC-IO, respectively. <br />Water withdrawal rates for urban and <br />rural uses in the various reporting <br />areas were derived from available <br />studies in the metropolitan areas, <br />State Water Plan reports, and Bureau of <br />Reclamation technical guidelines. <br />These withdrawals were then converted <br />to depletions using average basin <br />consumptive use factors. <br />The 1980 population of the Colorado <br />River system, estimated at about 3.8 <br />million, is increasing at an annual <br /> <br />14 <br />
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