WSP03985

• File Number: 8200.765
• Description: Little Snake River General
• State: CO
• Basin: Yampa/White
• Water Division: 6
• Date: 4/20/1990
• Author: Western Water Consul
• Title: Report on Modeling Approach and Project Configurations for Little Snake River Depletion Study
• Water Supply Pro - Doc Type: Report/Study

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2.2.2 Previous WIRSOS Model Runs

As part of the Sandstone Depletion Study, WWC modeled the Little Snake River

under four different scenarios acceptable to the USFWS, i.e, Present Modified Conditions

(PMC), Environmental Baseline (EB), Environmental Baseline with Sandstone Reservoir

providing supplemental irrigation and municipal water (EBISS-M), and Environmental

Baseline with Sandstone Reservoir providing supplemental irrigation and municipal water,

and industrial water (EB/SS-I). The following discussion is a brief description of each of

the above scenarios.

2.2.2.1 Present Modified Conditions (PMC). The PMC run simulated operation of the

Little Snake River over the 1930-1982 period of record with the level of development and

use existing along the river as of 1982. Demands on river water included current valid

water rights for irrigation and municipal uses (Baggs and Dixon) and depletions due to

transmountain diversion for the Cheyenne Stage I project.

2.2.2,2 Environmental Baseline (EE), The EB run simulated operation of the Little

Snake River over the 1930-1982 period using the demand level prepared for the PMC run

plus City of Cheyenne Stage II depletions and permitted water rights which are senior in

priority to Sandstone Reservoir.

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