FLOOD01459

• County: Gunnison
• Community: Uncompahgre Valley
• Title: Upper Gunnison-Uncompahgre Basin Phase 1 Feasibility Study Summary Report
• Date: 5/1/1989
• Prepared For: Colorado Water Resources and Power Development Authority
• Prepared By: HDR Engineering, Inc.
• Floodplain - Doc Type: Project

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6.0 IN-BASIN DEVELOPMENT PLAN FORMULATION AND EVALUATION

6.1 PLAN FORMULATION

The components retained after screening the alternatives discussed in the
previous chapter are listed in Table 6.1. These components were combined into
six alternative development plans to meet projected in-basin water demands.
The six plans were formulated with the intent of presenting a broad range of
development poss i bil it ies whi ch woul d meet the target objectives to some
degree. These alternative plans are defined in general terms as follows:

Alternative No. 1 - a group of 17 recreational components.
Alternative No. 2 - three storage reservoirs, one each in the Ohio Creek,
Tomichi Creek and Cochetopa Creek sub-basins.
Alternative No.3 - a combination of alternatives 1 and 2.
Alternative No.4 - three storage reservoirs of Alternative 2 combined
with ten recreation components selected from
Alternative No.1.
Alternative No. 5 - storage reservoirs on Tomichi Creek and Ohio Creek
combined with the ten recreation components from
Alternative No.4
Alternative No.6 - one storage reservoir on Tomichi Creek combined with
ten recreation components from Alternative No.4.

6.2 PLAN EVALUATION

The hydrologic computer model was used to evaluate the effects of
developing alternative plans. This allowed plans to be compared relative to
each other and also to the results of the No-Action Alternative discussed
previously in Chapter 4.

The recreation components included in alternative plans do not consume
water, although several of them may require management of streamflow through
changes in reservoir release patterns. When modeling alternative plans, these

6-1