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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Flexibility in Near-Term Operations
and General Hydrologic Data
Typical San Juan River Basin Hydrographs

Reservoir Storage Allocation

Dam

Rei..... for downstream"...

Definitions:

FLOOD. SURCHARGE: Portion .of reservoir storage assigned for the purpose of regulating flood
inflows to reduce flood damage dOWnstream.
AcnVE CAPACITY: Portion of~sel'VOirstorage assigned to regulate inflowtO provide water for
plJrpo$essuchasirri~tion, municipal and illdustrial use,fish & v.ildlife, recreation, etc.
INACnVE. CAPACITY: Portion. of reservoir storage .exclusjveOfand above the dead capacity, from. 'Mlich
stored water is riotnonnaltyavailable due to operating agreements or physical restrictions~
DEAD CAPACITY: That portion 9fa reservoir that cannot be evacuated by gravity.

Introduction

The Bureau of Reclamation has prepared a Final Environmental Impact Statement (FEIS) for the
purpose of operating Navajo Dam to implement Endangered Species Act (ESA) related flow
recommendations on the San Juan River. This appendix describes hydrologic data associated
with the project.

Flexibility

The Navajo Reservoir EIS evaluated three alternatives that would provide flows to conserve, in
concert with other recovery actions, endangered fishes in the San Juan River and provide water
for development. Only the Preferred Alternative (250/5000 release ranges) could meet all the
requirements of the Row Recommendations and future development, mainly completion of
NllP and ALP.