WSP01146

• File Number: 8281.400
• Description: Colorado River Studies and Investigations -- Colorado River Depletion Projections
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 1/1/1959
• Title: Depletions in Flow of Colorado River at Lee Ferry Due to Man's Activity in Colorado River Basin in Colorado
• Water Supply Pro - Doc Type: Report/Study

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rJ1 Average Temperature
N
. W
Jan. Feb. Mar. Apr. May ~ July Aug. SeJ<t. <<ll::t. Nov. Dec.
-- - - - -
Montrose 26 31.2 39.1 46.1 57.8 66.9 73.3 70.7 63.3 51.6 24.4 28.6
Longmont 27.1 30.6 37.1 47.463.3 64.2 71.8 70.2 61.8 50.7 30.0 30.4

It is evident from the above information that the two areas are very much alike,
while one is located a considerable distance south of the other, it is at a higher
elevation to compensate for it.

The consumptive use of water on both projects should therefore be nearly the
same. A 'stu<ly was made of a report put out by the Colorado Water Conserva-
tion Board on "Consumptive Use of Irrigation Water in Lower Uncompahgre
Valley", by John R. Erickson.

It appears that a good job was done in determining inflow and surface outflow
from the drains on the Uncompahgre River and other tributaries of the main
Gunnison but no stations were located on the main Gunnison above or below the
project to pick up any return flow f rom underground sources that got into the
main stream. This could be conSiderable, judging from the fluctuations in depth
to water in the' test wells located over the project and to which no consideration
waS given. The following lists the wells with their fluctuations:

- From Table 27-

Ma.ximum Distance to Water (Winter)

Uncom- W. D.. War- .131'0-
Calona pahgre Lynch Price Tobin Rogers Boye~ rich Holdenmby

42

33.4

33.8 23

14.8 29.9

. 9.4 3a. 0 27.7 10.8

Qli.peIa Smith
,
12.5 19

Minimum Distance to Wate:t' (Summer)
25. 6 20. 9 22. (; 14.2 3.4
Total 16.4' 12. 5 11. 3 8. 8 11.4

9.5
20.4

5.2
4.2

17.3 1.8
21 . 5 10. 4

1.8.8.5
9 4

6.1
12.9

Thr- following two paragraphs were copied from the Report: On page 35--
"Ground water levels as obtained at the observation wells were made as often
as practicable. . Valuations on the tabulation represents distances to the water
level below a set reference point near the ground surface. The wells observed
were free from any pumping operations which might cause material changes in
water level. "

On page 43.." From the records of diversions (table 24) and the well data
(table 27) (The maximum fluctuations of the wells are shown above), it is con.
eluded that no ground storage correction is necessary. "

-IS.