WSP05308

• File Number: 8111.810
• Description: Arkansas River Compact Administration - Clay Creek
• Basin: Arkansas
• Date: 1/1/1964
• Author: H. E. Eyrich
• Title: Clay Creek Seepage
• Water Supply Pro - Doc Type: Publication

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11.\ h'OLI' I;:. 1':",- H 1(' H
CONSUL TINe; ENGINEER
DENVER 19.COLORADO

P\jONE WEsr 4-1465
1660 SO. KING STREET

In order to determine the actual quantities of seepage, the per
centage of siltation was taken to be proportional to the per cent-
age of total in-flow water developed from month to month and it was
further assumed that the total losses to the well field and total
seepage losses would be on the left side of the reservoir, the right
side being known to be located against comparatively impervious pre-
consolidated bedrock substances.

The total initial losses that would occur during the ini-
tial flood stage would amount to 1020 acre-feet of water. This fig-
ure reduces rapidly after initial filling butt during the first year
of operation, it would be logical to expect 4,45 acre-feet of water
lost into the well field feeding the water supply for the city of
Lamarr Colorado. During the second year, this figure reduces rapidly
from 32 acre-feet during the month of May to a figure of less than
one acre-foot of water during the month of August. A total of 166
acre-feet of water was the assumed loss during the second year of
operation.

Three approximate reservoir operation studies were conducted
on the basis of the above assumptions and developed around the aver-
age annual precipitation rates with high, medium and low recorded
evaporation losses. In all cases, complete development of the reser-
voir will require the development time of siltation to extend into the
second year of operation. Considering a high evaporation year, the
water level would be drawn down to a maximum of plus 22 feet over the
creekbed, or a total draw down of 10 feet during the first year's op-
eration during the month of March. Assumming the medium evaporation
year, the draw down would be approximately 8 feet during the month of
14arch, and during a low evaporation year, approximately 7 feet during
the month of March. After the first year's operation, I do not an-
ticipate high seepage losses to continue.

The above operational study Was conducted on an approximate
basis in that the evaporation losses were not corrected for the reduc-
tion in the reservoir surface due to prior depletion nor was the effect
of the decrease in area included insofar as seepage factors will be
concerned. It would be logical to assume that, under any initial
yearly operat1oD1 spawning would not occur within this basin; however
the survival fac~or for fish stocked in this area would be satisfac- '
tory during even extremely low years of annual precipitation and high
evaporation,

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