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Synthesis of Studies in the Fall Low-Salinity Zone of the San Francisco Estuary, September–December 2011

U.S. Geological Survey (USGS) | July 14th, 2014

Summary

In fall 2011, a large-scale investigation (fall low-salinity habitat investigation) was implemented by the Bureau of Reclamation in cooperation with the Interagency Ecolo

In fall 2011, a large-scale investigation (fall low-salinity habitat investigation) was implemented by the Bureau of Reclamation in cooperation with the Interagency Ecological Program to explore hypotheses about the ecological role of low-salinity habitat in the San Francisco Estuary—specifically, hypotheses about the importance of fall low-salinity habitat to the biology of delta smelt Hypomesus transpacificus, a species endemic to the San Francisco Estuary and listed as threatened or endangered under federal and state endangered species legislation. The Interagency Ecological Program is a consortium of 10 agencies that work together to develop a better understanding of the ecology of the Estuary and the effects of the State Water Project and Federal Central Valley Project operations on the physical, chemical, and biological conditions of the San Francisco Estuary. The fall low-salinity habitat investigation constitutes one of the actions stipulated in the Reasonable and Prudent Alternative issued with the 2008 Biological Opinion of the U.S. Fish and Wildlife Service, which called for adaptive management of fall Sacramento-San Joaquin Delta outflow following “wet” and “above normal” water years to alleviate jeopardy to delta smelt and adverse modification of delta smelt critical habitat. The basic hypothesis of the adaptive management of fall low-salinity habitat is that greater outflows move the low-salinity zone (salinity 1–6), an important component of delta smelt habitat, westward and that moving the low-salinity zone westward of its position in the fall of recent years will benefit delta smelt, although the specific mechanisms providing such benefit are uncertain. An adaptive management plan was prepared to guide implementation of the adaptive management of fall low-salinity habitat and to reduce uncertainty. This report has three major objectives: •To provide a summary of the results from the first year of coordinated fall low-salinity habitat studies and monitoring. •To provide a synthesis of the results of the fall low-salinity habitat studies and other ongoing research and monitoring, to determine if the available information supports the hypotheses behind the adaptive management of fall low-salinity habitat as set forth in the adaptive management plan. •To begin to put the results from the fall low-salinity habitat studies into context within the larger body of knowledge regarding the San Francisco Estuary and, in particular, the upper San Francisco Estuary, including the Sacramento-San Joaquin Delta, Suisun Bay, and associated embayments.

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Synthesis Report: Integrating probability and targeted survey designs in regional stream condition assessments with examples from southern coastal California

California State Water Resources Control Board (SWRCB) | June 30th, 2010

Summary

Ambient water quality monitoring programs have traditionally relied on the use of targeted monitoring designs (in which sampling locations are assigned non-randomly) to a

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Synthesizing Conservation Motivations and Barriers: What Have We Learned from Qualitative Studies of Farmers’ Behaviors in the United States?

Society and Natural Resources (Routledge) | August 15th, 2019

Summary

Since 2011, qualitative studies examining adoption of conservation practices and programs (CPPs) have burgeoned. This article presents a systematic review of al

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Synthesizing Relationships Between Winter-Run Chinook Salmon Out-Migration Survival and Water Operations in the Sacramento–San Joaquin Delta

University of California, Davis (UC Davis) | December 19th, 2025

Summary

Sacramento River winter-run Chinook Salmon (Oncorhynchus tshawytscha) are an endangered population that faces numerous challenges across its life cycle, including juvenil

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Synthetic Streamflows

American Geophysical Union (AGU) | January 1st, 1971

Summary

Published by the American Geophysical Union as part of the Water Resources Monograph Series, Volume 1. This monograph contains virtually no mathematical derivations an

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System Reoperation (Resource Management Strategy)

California Department of Water Resources (DWR) | July 29th, 2016

Summary

System reoperation in the context of water resources means changing existing operation and management procedures for a water resources system consisting of supply and con

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System Reoperation Study, Phase 1: Plan of Study

California Department of Water Resources (DWR) | June 16th, 2011

Summary

System reoperation is generally defined as changing the operational and management procedures of existing water system facilities to obtain water resources related benefi

System reoperation is generally defined as changing the operational and management procedures of existing water system facilities to obtain water resources related benefits. Reoperation is considered an alternative to constructing major new facilities, although it may consist of physical modification of existing facilities. The specifics associated with a system reoperation strategy will vary among water purveyors depending upon the complexity of their system and their interest in participating in local and or interregional efforts. There may be opportunity to reoperate portions of California’s statewide water system to yield increased water resources related benefits. This opportunity was recently recognized by the State Legislature in Senate Bill X2 1 (SB X2 1) (Perata, 2008 – Water Code Section 83002.5), which mandated and allocated resources for “planning and feasibility studies to identify potential options for the reoperation of the state's flood protection and water supply systems that will optimize the use of existing facilities and groundwater storage capacity.” Specifically, SB X2 1 stipulated that “the studies shall incorporate appropriate climate change strategies and be designed to determine the potential to achieve the following objectives: (I) Integration of flood protection and water supply systems to increase water supply reliability and flood protection, improve water quality, and provide for ecosystem protection and restoration. (II) Reoperation of existing reservoirs, flood facilities, and other water facilities in conjunction with groundwater storage to improve water supply reliability, flood hazard reduction, and ecosystem protection and to reduce groundwater overdraft. (III) Promotion of more effective groundwater management and protection and greater integration of groundwater and surface water resource uses. (IV) Improvement of existing water conveyance systems to increase water supply reliability, improve water quality, expand flood protection, and protect and restore ecosystems. RELATED DOCUMENTS: System Reoperation Study, Phase 2: Strategy Formulation and Refinement System Reoperation Study, Phase 2: Appendix A: Forecast?Based Operations Analysis System Reoperation Study, Phase 2: Appendix B: Tradeoff Analysis System Reoperation Study, Phase 3 Report: Assessment of Reoperation Strategies System Reoperation, Phase 3: Appendix C: State Water Project and Central Valley Project Integrated Operations Analysis System Reoperation, Phase 3 Appendix D: Ecosystem Evaluation

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System Reoperation Study, Phase 2: Appendix A: Forecast-Based Operations Analysis

California Department of Water Resources (DWR) | January 29th, 2014

Summary

The System Reoperation Study (“Reoperation Study”) is investigating changes in operations and other strategies that may result in improved system performance in terms

The System Reoperation Study (“Reoperation Study”) is investigating changes in operations and other strategies that may result in improved system performance in terms of additional water supply, flood hazard reduction, and ecosystem protection and restoration. It is recognized that existing reservoir operations are typically based on meeting all or some of these three objectives. As such, the Reoperation Study focuses on modifications to existing operations and expansion of these benefits. The Reoperation Study team has developed several reoperation components to evaluate at select river/reservoir systems to quantify benefits and improve understanding of the trade-offs involved. MBK Engineers is providing technical, strategic, and coordination support for the Reoperation Study. An analysis of Forecast-Based Operation (F-BO) is part of that support. The following report summarizes this effort. F-BO can be applied to any reservoir with a traditional water supply and flood control space allocation paradigm. The incorporation of weather forecasts allows for greater flexibility in the management of the reservoir’s space (flood control versus conservation) and inherently increases the opportunities for gaining additional water supply and flood control benefits through its implementation. System reoperation is informed by historical flood patterns and utilizes records of inflow, outflow, and storage in the reservoirs to develop modified rules for flood releases. Changes to historical operations of the reservoirs is expected to reveal potential for additional water supply storage. With improvements to many of the reservoir facilities, such as increased release capacity, operations are no longer required to be as conservative as they once were. By reducing outflow and allowing an increase in water storage, significant improvements in water supply can be achieved. However, care must be taken so that sufficient water can still be evacuated in the event of a significant forecasted flood. RELATED DOCUMENTS: System Reoperation Study, Phase 1: Plan of Study System Reoperation Study, Phase 2: Strategy Formulation and Refinement System Reoperation Study, Phase 2: Appendix A: Forecast?Based Operations Analysis System Reoperation Study, Phase 2: Appendix B: Tradeoff Analysis System Reoperation Study, Phase 3 Report: Assessment of Reoperation Strategies System Reoperation, Phase 3: Appendix C: State Water Project and Central Valley Project Integrated Operations Analysis System Reoperation, Phase 3 Appendix D: Ecosystem Evaluation

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System Reoperation Study, Phase 2: Appendix B: Tradeoff Analysis

California Department of Water Resources (DWR) | March 3rd, 2014

Summary

The System Reoperation Study is designed to identify potential options for the reoperation of the state’s flood control and water supply systems to meet the following o

The System Reoperation Study is designed to identify potential options for the reoperation of the state’s flood control and water supply systems to meet the following objectives: Water supply reliability Flood hazard reduction Ecosystem protection and restoration Reoperation options include integration of flood control and water supply systems, effective conjunctive management, and improvements to existing water conveyance systems. This phase of the analysis focuses on integration of flood control enhancing water supply systems and expanded conjunctive management with existing conveyance systems. An analysis was designed and performed with the goal of identifying potential reoperation options and to improve understanding of existing system constraints. The analysis is referred to as the tradeoff analysis in recognition of the fact that the existing flood control/water supply system is highly integrated and currently operated to meet water supply, flood control, and ecosystem purposes. Current system operations are complex and frequently constrained by flood control and ecosystem requirements and water rights and contracts for the beneficial use of water. Therefore, reoperation options designed to meet one of the three objectives of the System Reoperation Study frequently create tradeoffs with the other objectives. For example, reductions in required reservoir space for flood control may improve water supply reliability but increase risk of flood damage. The tradeoff analysis is a reconnaissance-level study designed to help illustrate how operational changes designed for one purpose can affect other objectives. Because the existing reservoir and conveyance system is highly integrated and constrained, changes in operation for one purpose create tradeoffs with other purposes. A reconnaissance-level study can help identify these tradeoffs, some of which may be unexpected or unintended, and thereby help guide refinement of more promising options. Model simulations performed in the tradeoff analysis are not refined for the purpose of quantifying benefits or impacts, but rather are intended to illustrate how operational changes in one area affect other areas. For example, how Central Valley Project (CVP) operations can affect State Water Project (SWP) operations, and vice versa. RELATED DOCUMENTS: System Reoperation Study, Phase 1: Plan of Study System Reoperation Study, Phase 2: Strategy Formulation and Refinement System Reoperation Study, Phase 2: Appendix A: Forecast?Based Operations Analysis System Reoperation Study, Phase 2: Appendix B: Tradeoff Analysis System Reoperation Study, Phase 3 Report: Assessment of Reoperation Strategies System Reoperation, Phase 3: Appendix C: State Water Project and Central Valley Project Integrated Operations Analysis System Reoperation, Phase 3 Appendix D: Ecosystem Evaluation

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System Reoperation Study, Phase 2: Strategy Formulation and Refinement

California Department of Water Resources (DWR) | March 3rd, 2014

Summary

The California Department of Water Resources (DWR) is conducting a system reoperation study (SRS) in cooperation with other State and federal agencies, local water distri

The California Department of Water Resources (DWR) is conducting a system reoperation study (SRS) in cooperation with other State and federal agencies, local water districts, groundwater managers, and other stakeholders, to identify potential strategies for reoperation of the statewide flood protection and water supply systems. The opportunity to reoperate portions of California’s statewide water system to yield increased water resources-related benefits was recognized by the State Legislature in Senate Bill X2 1 (SB X2 1) (Perata, 2008 – Water Code Section 83002.5). California’s statewide water system is comprised of a multitude of local, state, and federal projects. These projects include facilities such as dams and reservoirs, hydropower plants, canals, and water diversion structures. Many of these facilities were developed in the early to mid-20th century, and were not designed, constructed, or operated as an integrated water supply and flood management system. Over time, operations of the two largest water supply projects, the State Water Project (SWP), operated by DWR and the Central Valley Project (CVP), operated by the U.S. Department of the Interior’s Bureau of Reclamation (Reclamation), have been integrated to a certain degree. California’s water supply and flood management infrastructure is physically interconnected to the extent that it is technically feasible to move water around the system from Trinity County in the north to Imperial County in the south. However, the management of the water system is not as well integrated as it could be. The underlying logic of the SRS is that California can do much more with its existing water infrastructure by taking advantage of the physical interconnections (and enhancing them) while also operating the system in a coordinated manner to optimize the benefits. The current focus of the SRS is the Central Valley because this region has the highest integration of water supply and flood management facilities. Additionally, the greatest potential for ecosystem restoration through infrastructure reoperation is found in the Central Valley because the existing infrastructure has had a profound effect on aquatic ecosystems. RELATED DOCUMENTS: System Reoperation Study, Phase 1: Plan of Study System Reoperation Study, Phase 2: Strategy Formulation and Refinement System Reoperation Study, Phase 2: Appendix A: Forecast?Based Operations Analysis System Reoperation Study, Phase 2: Appendix B: Tradeoff Analysis System Reoperation Study, Phase 3 Report: Assessment of Reoperation Strategies System Reoperation, Phase 3: Appendix C: State Water Project and Central Valley Project Integrated Operations Analysis System Reoperation, Phase 3 Appendix D: Ecosystem Evaluation

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Synthesis of Studies in the Fall Low-Salinity Zone of the San Francisco Estuary, September–December 2011

Synthesis Report: Integrating probability and targeted survey designs in regional stream condition assessments with examples from southern coastal California

Synthesizing Conservation Motivations and Barriers: What Have We Learned from Qualitative Studies of Farmers’ Behaviors in the United States?

Synthesizing Relationships Between Winter-Run Chinook Salmon Out-Migration Survival and Water Operations in the Sacramento–San Joaquin Delta

Synthetic Streamflows

System Reoperation (Resource Management Strategy)

System Reoperation Study, Phase 1: Plan of Study

System Reoperation Study, Phase 2: Appendix A: Forecast-Based Operations Analysis

System Reoperation Study, Phase 2: Appendix B: Tradeoff Analysis

System Reoperation Study, Phase 2: Strategy Formulation and Refinement

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