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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During the same 18 year period, the undepleted sub-
basin water supply averaged 988,500 acre feet per year. Fig-

ures on watershed runoff, inbasin water use, water exported
from the basin to Eastern Colorado and the undepleted water
supply'of the subbasin are given in the following table. The
amount of water exported from the basin has remained about the
same over the 18 year study period.
Undepleted Roaring Fork Subbasin Runoff
Average For 18 Year Period 1943-1960 - Units Acre Feet

River Runoff at Glenwood Springs
Inbasin Stream Depletion
,Exported vlater
:Imported (Middle Park Subbasin)
Net Undepleted Subbasin I/ater Supply

900,400
48,700
41,900
- 2.500
988,500

Present N~ter Use

A study of the land of the subbasin by the Bureau
of Reclamation in 1939 showed a total of 34,590 acres irriga-
ted prior to the study period. A study also conducted by the
Bureau of Reclamation showed that irrigation by 1951 had been
expande,d to a total of 37,032 acres. A recent field reconnais-
sance check of subbasin land indicates that the presently irri-
gated subbasin land amounts to about 37,620 acres. This is an

increase of 3,230 acres over that irrigated prior to the study
period or an increase of 9.3% in the 25 year period since 1939.
A major portion of the irrigated land receives an

adequate supply of water. Irrigation investigations indicate
that as much as 7,750 acres of the 37,280 acres irrigated are

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