WSP10841

• File Number: 8200.760
• Description: Yampa River General
• State: CO
• Basin: Yampa/White
• Water Division: 6
• Date: 1/1/1993
• Author: Hydroshpere
• Title: Yampa River Basin Alternatives Feasibility Study - Executive Summary - Draft - January 1993
• Water Supply Pro - Doc Type: Report/Study

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CHAPTER 4 - Evaluation of Potential Reservoir Sites
Inventory of Potential Sites ......................................... ................................................. 4-1

Information Sources........................................................ ................................. 4-1
Preliminary Screening....................................................................................... 4-1
Further Screening of Potential Sites...................................................................... 4-3

Results of Secondary Screening........................................................................... 4-4
Selection of Sites for Field Reconnaissance............................................................. 4-5
Field Reconnaissance of Potential Sites............................................................................ 4-6
Site Evaluation Methodologies ............................................................................ 4-8
Summary of Field Evaluations........................................................................... 4-11
Comparative Evaluation of Potential Reservoir Sites.......................................................... 4-24

General Approach.. .......................................................................................... 4-24
Single-Discipline Evaluations............................................................................. 4-25
Multi-Disciplinary Evaluation.................... ............ .................................... .........4-25
Site Selection Recommendations.................... ............................................ .........4-27

CHAPTER 5 - Development of Basin Computer Model
Modeling Objectives and Approach ................................................................................ 5-1
Review of Previous Basin Modeling ............................................................................... 5-1

The HYDROSS Model....... .................. ........... ...... .................. .......... ...... .......... 5-1
Hydrology and Demands Represented in the HYDROSS Model................................... 5-2
Review of HYDROSS Modeling Assumptions......................................................... 5-2
CO\TIparison of HYDROSS & Feasibility Study Depletion Assumptions .........................5-3

Development of Basin Model......................................'.................................................. 5-4
Introduction to Network Modeling ....................................................................... 5-5

Model Configuration........................................................................................ 5-5
Representation of Hydrology in the Basin Mode!...................................................... 5-9
Representation of Demands and Reservoirs............................................................ 5-14

Reservoir Operations .............................. ............................................. ....... ..... 5-21
Model Validation...... ...................................................................................... 5-23

CHAPTER 6 - Evaluation of Alternatives

Overview.............................................. .................................................................. 6-1
Evaluation Criteria........................................................................................... 6-1
Use of the Basin Model..................................................................................... 6-1

Definition of Alternatives.................................................................................. 6-2
Scenario I - No Action (Baseline)................................................................................... 6-3
Key Assumptions of Scenario ............................................................................. 6-3
Results of Scenario 1........................................................................................6-5
Scenario II - Conversion of Juniper Rights Only..........................................................;..... 6-7
Key Assumptions of Scenario ............................................................................. 6-7

Results of Scenario II ....................................................................................... 6-8
Scenario III - Enlargement of Elkhead Reservoir ............................................................... 6-13
Key Assumptions of Scenario ....................... .....................................................6c13

Results of Scenario III ..................................................................................... 6-15
Scenario IV - Enlargement of Elkhead and Stagecoach Reservoirs .........................................6-19
Key Assumptions of the Scenario .................................................. ...................... 6-19
Results of Scenario IV ........................................... .......................................... 6-19
Scenario V - Elkhead Enlargement with Williams Fork Project.............................................6-21
Key Assumptions of Scenario ............................................................................ 6-21

Results of Scenario V ...................................................................................... 6-24

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