WSP08430

• File Number: 8200.760
• Description: Yampa River General
• State: CO
• Basin: Yampa/White
• Water Division: 6
• Date: 1/1/3000
• Author: Unknown
• Title: Executive Summary - Task 4 Technical Memorandum on Hydrology Water Rights and Development of Basin Model - Yampa River Basin Alternatives Feasibility Study - Draft
• Water Supply Pro - Doc Type: Report/Study

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TASK 4 TECHNICAL MEMORANDUM
ON
HYDROLOGY, WATER RIGHTS AND DEVELOPMENT OF BASIN MODEL

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INTRODUCTION

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Overview of Study Process

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The Yampa Hiver Alternatives Feasibility Study is comprised of 11 tasks listed below, The study
schedule proceeds through these 11 tasks more or less in the order they are listed, with the exception
that Task I, Study Coordination Activities, is ongoing throughout the study.

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Task 1:
Task 2:
Task 3:
Task 4:
Task 5:
Task 6:
Task 7:
Task 8:
Task 9:
Task 10:
Task 11:

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Study Coordination Activities
Define Water Demands
Reservoir Site ldentification and Preliminary Screening"
Hydrology and Water Hights
Reservoir Site Evaluation
Project Formulation
Evaluation of Alternatives
Review and Screen Alternatives
Final Evaluation and Selection of Hecommended Project
Project Development Plan
Prepare Final Report

At this writing, Tasks 2, 3, and 5 have been completed and documented. Task 4 is complete
except for documentation. The documentation of Task 4 is the subject of this memorandum. Task 6
and Task 7 have been initiated and use the modeling products of Task 4.

The objectives of this task were to develop methods for estimating virgin or baseline inflows at
various reservoir siles in the basin and to develop a model of the hydrology and water rights
administration of the basin. The hydrology, water rights administration and operations assumptions of
the USFWS HYDROSS studies were reviewed in detail. in developing the basin model, the effects of
existing projects and water rights were left in the gaged flow data set under the assumption that they will
be operated in the future as they have in the past. Effects of existing projects and water rights that may
be specifically operated in this study were removed. The water demand analysis (Task 2) is used in Task
4 to define water requirements which might be satisfied by these projects and rights.

Objectives of Task 4

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An analysis of the Juniper-Cross Mountain water rights was also included in this task. Special
attention was given to identifying existing subordinations, evaluating the potential for transfer of rights
to other uses and evaluating the potential utility of the Juniper rights for protection of in stream flows.

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