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<br />en <br />( , <br />o::r< <br />.-j <br /> <br />Total undep1eted water supply for the Basin averaged about 2,175,000 acre-feet <br />annually for the 1943-60 study period, not considering on-site use by native <br />forest and range vegetation. It ranged from about 1,130,000 acre-feet to more <br />than 3,600,000 acre~feet annually. Water supply depletions in the Basin <br />have been estimated. Net consumptive use by crops was computed by the Blaney- <br />Criddle procedures based on climatic records for the 1943~60 study period <br />and the average crop acreage distribution, with appropriate adjustments <br />for variations in adequacy of water supply. Depletions resulting from <br />crop consumptive use on the 264,000 irrigated acres averaged 312,100 <br />acre-feet annually. Other depletive uses of the water resource were <br />separately estimated by appropriate procedures. These included consumptive <br />use on noncrop water-using areas incidental to irrigation development, <br />use by riparian and nonbeneficia1 phreatophytic vegetation, evaporation <br />from lakes and reservoirs, municipal and domestic use, and other minor <br />uses. Aggregated, these water-supply depletions averaged about 156,300 <br />acre-feet annually for the 1943-60 study period. <br /> <br />There are several authorized or proposed reclamation projects within the Basin. <br />In addition, other agricultural project opportunities appear feasible as dis- <br />cussed in succeeding sections of the report. Ultimate water-supply requirements <br />to meet the increased needs resulting from completion of these projects, munic- <br />ipal and domestic requirements of increased population, foreseeable increased <br />recreation developments, and other minor consumptive uses, were similarly <br />estimated. <br /> <br />The average annual water resource for the 1943-60 study period, and the present <br />and ultimate potential use, is summarized by subbasiris as descr10ed on page 24 <br />in the following tabulation. <br /> <br />Undep1eted <br />subbasin <br />supply adjusted <br />for present <br />within-basin <br />diversions <br /> <br />Upper Gunnison <br />Smith Fork-Crystal <br />North Fork <br />Uncompahgre <br />Whitewater <br />Unaccounted depletion l/ <br /> <br />912,000 <br />66,800 1/ <br />469,300 <br />618,900 <br />105,900 <br /> <br />Totals <br /> <br />2,ln,900 <br /> <br />Present <br />average <br />consumptive <br />use <br /> <br />Ultimate <br />consumptive <br />use with <br />potential <br />project <br />developments <br /> <br />Acre-feet <br /> <br />57,681 <br />28,777 <br />100,770 <br />239,374 <br />25,022 <br />14.800 <br /> <br />102,182 <br />69,009 <br />148,689 <br />287,909 <br />30,913 <br />.14,800 <br /> <br />466,400 <br /> <br />653,500 <br /> <br />1/ Does not include potential water supply importation from Upper Gunnison <br />Subbasin. <br />l/ Unexplained residual between inflow and total of estimated consumptive <br />uses and outflow. <br /> <br />- 14 - <br />