NOAA National Marine Fisheries Service’s (NMFS) Biological and Conference Opinion on the Long-Term Operations of the Central Valley Project and State Water Project National Research Council Committee on Sustainable Water and Environmental Management in the California Bay-Delta
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
Biological and Conference Opinion on the Long-Term Operations of the Central Valley Project and State Water Project
National Research Council
Committee on Sustainable Water and Environmental Management in the California Bay-Delta
January 25, 2010
Historical fall-run habitat Current fall-run habitat
James J. Anderson, University of Washington & Columbia Basin Research
Mike Deas, Watercourse Engineering, Inc.
Philip B. Duffy, Climate Central, Inc.; University of California, Merced
Daniel L. Erickson, Consultant
Reg Reisenbichler, Retired--U.S. Geological Survey (USGS)
Kenneth A. Rose, Louisiana State University
Peter E. Smith, Retired--USGS
Richard A. Marston
Ian A. Fleming
E. Eric KnudsenPeer Reviews of theDraft Biological Opinion
CALFED & CIE reviews supported NMFS overall conclusions
90-99% mortality from project and non-project stressors
Alternatives to water supply evaluated and included in RPA:
Long-term Average Annual and End of September Storage Differences for Shasta Storage, Spring Creek Tunnel Flow, and Keswick Release
Study 6.0 = 2004 operations Study 7.1 = near future operations
Study 7.0 =current operationsStudy 8.0 = future operations
Mean Daily Temperature (F)
Water Year TypeEgg and Fry Mortality by Water Year Type at Balls Ferry
Water Year Type
Water Year Type
2 months closed
up to 70% of the spring-run
Folsom and Nimbus Dams
Loss of natural river function
Warm water temps
New Melones and Stanislaus River operations
July- Orange Blossom Bridge
Daily Temperature Variability
Kondolf, et al. 2001
Proposed Export Changes
Direct Entrainment at Project Facilities
Indirect Mortality within Delta
San Joaquin River Inflow to Delta
Fall and winter seasons have greatest sensitivity to climate change according to OCAP modeling.
In wet years: > risk of pumping entrainment in winter compared to current climate.
In dry years: minimal change in OMR flows during winter and spring.
In wet years: < pumping entrainment risk in winter, more positive OMR flows
In dry years: > risks in the winter , slightly more negative OMR flows
rotary screw trap sampling 1995-2006
(Low, White, and Chappell 2006)
CVP and SWP exports increase in both near future (Study 7.1) and future conditions (Study 8.0) compared to the current condition (Study 7.0).
Significant increases in exports during the late fall and winter time frames over current operations.
SWP exports increase in April and May due to decrease in “fish water” available for export curtailment.
Elevated exports result in an increased potential for entrainment at the export facilities, as well as migrational delays for fish entering the Delta interior,
Increases in exports reflected in increased negative Old and Middle River flows
Diversion of listed fish into the interior of the Delta increases the risk of mortality (i.e., predation) as well as exposure to contaminants in the Delta interior. Overall mortality in the interior Delta:
35-90% of those that enter the interior Delta
5-20% of winter-run Chinook salmon population entering the Delta
San Joaquin River Basin fish have an increased vulnerability to entrainment with increased exports levels.
Flow Patterns in the Delta
SWP Loss vs. OMR flows
Assessed indirect mortality within delta interior utilizing applicable studies and literature.
Compared export and non-export related mortality within the interior delta utilizing DWR’s Delta Survival model and CalSim II output from Studies 7.0 (current operations),
7.1 (near future operations), and 8.0 (future operations).
Assessed recent survival studies utilizing acoustically tagged fish.
Monthly Indirect mortality (non-export) for Sacramento River fish ranged from 3% to 32% combining all studies and water year types for the period between December and June.
Higher E/I ratios had higher mortality levels.
Higher E/I ratios typically occurred in December and January in drier hydrological conditions.
Monthly total population mortality for Sacramento River basin fish migrating downstream in the Sacramento River ranged from 23% to 59% under same conditions as above.Results from DWR Survival Model
And Spring Time flows 2.5 years Earlier
From Baker and Morhardt, 2001
and the Vernalis flow to export ratio 2.5 years earlier
From 2006 VAMP report