WSP04694

• File Number: 8281.400
• Description: Colorado River Studies and Investigations -- Colorado River Depletion Projections
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 6/1/1965
• Author: C. Jex Engineers
• Title: Report on Water Runoff and Stream Depletion of the Main Stem Colorado River Basin in Colorado
• Water Supply Pro - Doc Type: Report/Study

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Transmountain Diversions - Units Acre Feet
S!ubbasin Historic YAnticipated Conditional YPotentia1
Diversions Diversions Diversions Ultimate
J'r.;iddle Park 206,300 384,000 150,900 741,200
Eagle River 4,000 74,600 28,500 107,100
Roaring Fork 41,900 80,100 122,000
T.ota1 252,200 538,700 179,400 970,300

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Additional to historic diversions

Includes conditional diversions requiring the
replacement of water for in-basin use.

Basin Runoff and Stream Depletion

The historic annual runoff of the basin for the 18

year s~udy period 1943-1960 averaged 2,852,300 acre feet.
This added to the estimated stream depletion for the same 18
year p~riod of 733,700 acre feet gives 3,586,000 as the
annual; undepleted State line flow. The anticipated future
additi~na1 stream depletion is estimated to be 873,800 acre
feet which if added to the 18 year average depletion of 733,700
makes ~ total stream depletion for the basin of 1,607,500 acre
feet. If anticipated basin development is accomplished with
resulting stream depletion, the yearly water dishcarged from
the basin during a period of years comparable to the 18 year
period of 1943-1960 would average 2,006,800 acre feet (2,852,300
,

-873,800 + *28,300). This added to the Gunnison River average
annua1'residua1 flow of 1,502,300 would amount to 3,509,100

acre f~et per year as the ultimate downstream contribution of

the main stem Colorado River and the Gunnison. This figure

':'Vlat"r'in:portud to basin from Gunnison, White and Yampa Rivers.

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