WSP11585

• File Number: 8445
• Description: Union Park
• State: CO
• Basin: South Platte
• Water Division: 1
• Date: 10/1/1989
• Author: WRC Engineering
• Title: Engineering Report fo the Union Park Project Water Rights
• Water Supply Pro - Doc Type: Report/Study

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Approach 2 / Scenario 3
Includes operation of Blue Mesa Reservoir to satisfy the demands of
existing downstream water requirements, including the Gunnison
Tunnel, similar to what has historically occurred.
Assumptions:

1) Inflow to Blue Mesa was estimated using the historic diversions
to the Gunnison Tunnel, recorded streamflows downstream to the
tunnel, the hi stori c monthly changes in 81 ue Mesa storage
(1965-1986) and an estimate of the evaporation losses.

2) Includes all of the assumptions of Scenario 2, i.e., the minimum
streamflow requirements decreed in 82CW340.

3) Pumping from Taylor Park Reservoir to Union Park Reservoir was
assumed to be a maximum of 12 hours per day, when water is available.

4) ~inimum streamflow requirement downstream of the Gunnison Tunnel
equal to 300 cfs.

5) Releases from Blue Mesa Reservoir were made to meet minimum flow
(300 cfs), historic Gunnison Tunnel diversion and any shortages
wh i ch may occur at the headgate of the Redl ands Power Canal near
Grand Junction (670 cfs).

6) No requirement for hydroelectric diversions at Blue Mesa.

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