PROJ00329

• Contract/PO #: C153370
• Contractor Name: Dames and Moore
• Contract Type: Loan
• Water District: 0
• County: Weld
• Bill Number: SB
• Loan Projects - Doc Type: Contract Documents

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e. The potential beneficial uses of the project water will
be defined in conjunction with the work in Task 7. In
determining potential uses for the water developed by
the dam, either directly or through exchange,
consideration shall be given to uses located in any
portion of the South Platte Basin which lies below
Chatfield Dam. For this task, the emphasis will be on
the potential water rights exchanges which might be
implemented through the project.

Task 9 - Reservoir Operation Studies

The purpose of the reservoir operations studies is to
provide a rational basis for selecting an optimum project
configuration including reservoir size and operating guidelines.
Operating assumptions and alternatives to be evaluated will be
developed in consultation with the CWCB. This task will
incorporate much of the work described above and will include the
following:

a. The data compiled in Task 6 (reservoir design), Task 7
(alternative uses) and Task 8 (water rights) will
culminate in month-by-month tabulations of potential
uses and available water. The month-by-month periods
to be selected will be dependent upon a judgemental
analysis of significant conditions. As a minimum, a
"normal" year of operation and a series of ncritical"
(dry) years wil~ be selected. These sequences may be
either historical or stochastically generated.

b. These normal and critical sequences will,be routed
through the Hardin Reservoir and to the points of use
in a corresponding month-by-month reservoir operation
study, for reservoirs of alternative sizes, to
determine the storage requirements for the assumed
uses.

By repeating this study for various assumptions of use,
an array of storage requirements for different assumed
uses will be developed. Superimposed on these storage
requirements will be requirements and limitations
assumed for flood control, hydropower and recreation
to obtain overall requirements and limitations on
storage.

Task 10 - Economic Analyses,

The purpose of the economic analyses is to compare
benefits resulting from the project with the estimated costs to
provide an indication of economic feasibility. Benefits and
costs will be evaluated for several alternative project sizes
with varying combinations of alternative uses for each project
size. Only those benefits and costs which can be readily

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