PROJ00406

• Contract/PO #: FS0004X
• Contractor Name: Green Mountain Exchange Project CWRDA
• Contract Type: Loan
• Water District: 0
• County: Grand
• Loan Projects - Doc Type: Feasibility Study

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3,0 WATER RESOURCES

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Hydrologic analyses were conducted to estimate the yield from each reservoir site and to
estimate the capability of the proposed reservoirs to meet the requirements of a Joint-Use Reservoir
or to function as Replacement Reservoirs for the Green Mountain Exchange Project, Legal and
operational considerations involved hydrologic characteristics, administration of the Upper Colorado
River Basin and projected water resources utilization. Specific hydrologic analyses were made of
the following:

o

A water rights analysis provided estimates of flows that are legally available for
storage at the six proposed sites based on the monthly flows for the 1951 to 1983
hydrologic study period, The analysis was performed for existing conditions and
moderate and high levels of future development of conditional water rights (see
Section 3,3).

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o

Reservoir operation analyses were performed to estimate the firm annual yield of
each reservoir site, In consultation with the Authority, the firm annual yield was
defined as the volume of water that can be provided every year without any shortage,

o

The Green Mountain Reservoir was analyzed in detail to estimate its yield based on
the requirements of Senate Document No, 80, existing USBR operating policies and
existing Colorado River administration.

o Operational analysis of the Upper Colorado River Basin with projected future water
demands provided an estimate of the increased yield of Dillon Reservoir due to
pumpback operation and provided estimates of the yields of single reservoirs and
combinations of reservoirs serving as Replacement Reservoirs for Green Mountain
Reservoir,

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