PROJ00259

• Contract/PO #: C153424
• Contractor Name: Colorado River Water Conservation District
• Water District: 0
• Bill Number: XB 99-999
• Loan Projects - Doc Type: Feasibility Study

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The U.S. Bureau of Reclamation investigations of the proposed
Kendig damsite are adequate for preliminary design. Prior to final
design, the possible local sources of construction material need to be
investigated, and the engineering properties of the materials
determined. Additional information on the hydrogeology of the bedrock
will be need for the design of a cutoff trench or grout curtain. The
landslide that encroach on the reservoir need to be investigated in
more detail to determine their stability wi th reservoir filling and
drainage.

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For the Upper Kendig damsite, preliminary geotechnical stu-
dies will be required to determine the feasibility of the site. These
studies should include topographic and geologic mapping of the dam
alignment and reservoir, core drilling, sampling, and hydrogeologic
testing of at last four holes along the dam axis, and an evaluation
and testing of local sources of construction materials.

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3. Dam Layouts

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Embankment dam layouts were done for three different size
dams at each of the two dam sites. The maximum reasonable size dam
selected for Lower Kendig was 25,000 acre-feet. Dams with 2/3 and
1/3 of this reservoir size were laid out. The maximum reservoir con-
sidered at the Upper Kendig site was 18,300 acre-feet. The two
smaller reservoir layouts at the Upper Kendig site have capacities of
13,900 and 6,100 acre-feet. All embankment dams were laid out
according to the criteria described in Section IV, A,3. General plans
of the Dams and Reservoirs are also shown on Figures IV-1 and IV-2.

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The intermediate size embankment dam at Lower Kendig (18,000
acre-feet) is essentially the same as that included in the USBR
planning studies (Ref. 43). The quantity estimates done by the USBR
when used where appropriate to allow a comparison of the resulting
cost estimates. Although differences in the general approach to the
cost estimates do exist, there are few differences in the actual quan-
tity estimates done for each dam.

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The preliminary geologic evaluations were sufficiently
favorable that roller compacted concrete dams were laid out for both
sites and for the range of sizes.

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4. Flood Hydrology and Spillway Layouts

The drainage basins tributary to the two Kendig dam sites are
the largest among those analyzed as part of this study. Because of

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IV-8

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