9581

• UCREFRP Catalog Number: 9581
• Author: U.S. Bureau of Reclamation.
• Title: Final Environmental Impact Statement - Navajo Reservoir Operations Volume II Technical Appendices.
• USFW Year: 2006.
• USFW - Doc Type: Grand Junction - Durango, CO.
• Copyright Material: NO

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Co nte nts

Page

Introduction. . . . . . . " " . . . . . ... ... . . . . " . . . . ... . . .. . . . . . . .. . . .. .. . . . . .. . . . . . . . . .. C-1

Modeling Approach ....... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .' . . . . . . . . . . . . . . . . . . . . . .. C-1

RiverWare .. . . . . . . . . . . . . . . . " . . . . .. . . . . . . . . . .. . . . . . . .. .. ., .. . .. . ... . . . . . . . .. C-1

RiverWare Model of the Sanjuan River ........................................ C-3
Configuration for No Action Alternative. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ~ . . . . . .. C-7
Configuration for the 250/5000 and 500/5000 Alternatives. . .. .. . .. . . . .. . . . . . . . . .. C-7

Impact Analysis Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. C-13

No Action Analysis. . . . . .. . . .. . . . . . . . . . . . .. . . . . .. . . . . . . . . . . . .. . . ... .. . . . . . .. C-13

PreferredPlan~250/5000Alternative ......................................... C-13
San Juan River at Archuleta Impacts .......................................... C -13
Animas River at Farmington Impacts ......................................... C-17
San Juan River at Farmington Impacts. . . . . . . . . . . .. . . . . . . . . . .. . . . . . . . . .. . .. . . .. C-20
San Juan River at Four Comers Impacts ....................................... C-23
Navajo Reservoir Water Level Impact from Operation of the Preferred Plan........ C-28

Tables

~bre Page

1 Summary of San Juan River Basin depletions for each alternative ................ C-8
2 Summary of streamflows measured during 2001 Summer Low Flow Test ........ C-14
3 Mean, maximum and minimum average flow of the San Juan River at
Archuleta for the No Action, Preferred, and 500/5000 Alternatives

(1929-1993 data) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . .. C-14

4. Mean monthly flows for the Animas River at the confluence with the San Juan
River for the No Action, Preferred, and 500/5000 Alternatives

(1929-1993 data) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . " C-17

5 Mean monthly flows for the Animas River at Farmington, New Mexico
(USGS Gage) for the No Action, Preferred, and 500/5000 Alternatives

(1929-1993 data) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. C-20

6 Mean monthly flows for the Animas River at Four Corners, Colorado
(USGS Gage) for the No Action, Preferred, and 500/5000 Alternatives

(1929-1993 data) . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . ~ . . . . . .. C-24

7 Summary statistics of meeting Flow Recommendations criteria for alternatives
retained for further analysis .............................................. C-27
8 Summary statistics 1929-1993 water years... . " . . ... .. . . .. ..... ... . . .... ... .. C-28