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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.1 A HOLD I.:. I.~y H Ie H
CONSULTING E"JGINEER

PHONE WEST "-1465
1660 so. KING STREET

DENVER 19.COLORADO

May 28, 1964

Colorado Department
6060 Broadway
Denver, Colorado

of Game, Fish & Parks

HE: Seepage of Clay
Creek Reservoir

Att: Mr. E. L. Shaw, Chief Engineer
Dear Sir:

Pursuant to decisions made in a conference between the
Colorado Department of Game) Fish & Parks and the Colorado Water
Conservation Board, please be advised that a study of seepage
losses in the Clay Creek Reservoir has been conducted by this of-
fice, the results of which are herein included for your informa-
tion and record.

The Clay Creek Reservoir basin, with the exception of
the creekbed, is covered with from one to seven feet of fine silt
with a dry density of approximately 101 pounds per cubic foot. The
present creek channel vdll be blanketed with this same material
during the course of construction.

In order to determine the seepage effects of initial fill-
ing and continued operation of the Clay Creek Reservoir, it was nec-
essary to make a certain number of simplyfing assumptions. These
assumptions will be discussed as follows:

The siltation effect was assumed to be established on the
faetor that one-third of the entire in-flow into this reservoir would
be of a rapid runoff nature. The total yearly in-flow Was calculated
to be 5261 acre-feet on an a~erage annual basis. The rapid in-flow,
as a result, amounted to 1750 acre-feet which contained an apprecia-
ble quantity of silt. The estimated average silt burden was assumed
to be 15 per cent, whieh was one-halt of that assumed to be available.
in the Tipton-Kalmbaeh report on the water conditions surrounding
Lamar, Colorado, submitted in 1954. On this basis, 263 acre-feet of
silt Will accumulate on an annual basis within the basin. It Was as-
sumed that the retention time would be sufficient to remove one-half
of the silt burden; in other words, 132 acre-feet of silt per year.

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