California Natural Resources Agency | August 27, 2018...
Summary
Long-term shifts in the timing and magnitude of reservoir inflows will affect water supply reliability in California. Hydro-economic models can help explore climate...
Long-term shifts in the timing and magnitude of reservoir inflows will affect water supply reliability in California. Hydro-economic models can help explore climate change concerns by identifying system vulnerabilities and adaptation strategies for statewide water operations. This work contributes a new open-source limited foresight implementation of the CALVIN model, a hydro-economic model including roughly 90% of California’s urban and agricultural water demands. The model includes the ability to determine water allocations on an annual basis without knowledge of future availability, and to efficiently evaluate ensembles of streamflow projections representing a range of possible future climates. We then assess the vulnerability of the statewide system to changes in total annual runoff and the fraction of runoff occurring during winter, which primarily depends on temperature. Results are analyzed with a focus on adaptation strategies, aided by the economic representation of water demand in the model. These strategies include changes to reservoir operating policies, and conveyance and storage expansion. As water availability decreases, model results show quadratic increases in shortage cost, and corresponding increases in the marginal costs of adaptation strategies and environmental flow constraints. Reservoirs adapt to warmer climates by increasing average storage levels in winter and routing excess runoff to downstream reservoirs with available capacity. Both small and large changes to reservoir operations were observed compared to historical hydrology, showing that no single operating strategy achieves optimality for all reservoirs. Increasing the fraction of winter flow causes small increases in total shortage cost, indicating the ability to manage a changing hydrologic regime with adaptive reservoir operations. The results of this project improve estimates of the cost of climate change to California’s water system under a range of future conditions and highlight adaptation strategies that minimize costs of increased hydrologic variability.
National Marine Fisheries Service (NMFS) | June 4, 2009...
Summary
The purpose of this document is to present NOAA’s National Marine Fisheries Service’s (NMFS) biological and conference opinion (Opinion), about whether the U.S....
The purpose of this document is to present NOAA’s National Marine Fisheries Service’s (NMFS) biological and conference opinion (Opinion), about whether the U.S. Bureau of Reclamation’s (Reclamation) proposed long-term operations of the Central Valley Project (CVP), operated in coordination with the State Water Project (SWP; hereafter referred to as CVP/SWP operations, the proposed action, or the project), is likely to jeopardize the continued existence of the following species
Endangered Sacramento River winter-run Chinook salmon (Oncorhynchus tshawytscha, hereafter referred to as winter-run)
Threatened Central Valley spring-run Chinook salmon (O. tshawytscha, hereafter referred to as spring-run)
Threatened Central Valley (CV) steelhead (O. mykiss)
Threatened Central California Coast (CCC) steelhead (O. mykiss)
Threatened Southern Distinct Population Segment (DPS) of North American green sturgeon (Acipenser medirostris, hereafter referred to as Southern DPS of green sturgeon)
Endangered Southern Resident killer whales (Orcinus orca, hereafter referred to as Southern Residents)
or destroy or adversely modify the designated critical habitat of the above salmon and steelhead species, or proposed critical habitat for Southern DPS of green sturgeon. This Opinion is based on the best scientific and commercial information available.
California Department of Water Resources (DWR) | January 10, 2019...
Summary
Bulletin 132-17, Management of the California State Water Project, continues the Bulletin 132 annual series begun in 1963. Bulletin 132‑17 reports water supply planning, construction,...
Bulletin 132-17, Management of the California State Water Project, continues the Bulletin 132 annual series begun in 1963. Bulletin 132‑17 reports water supply planning, construction, financing, management, and operation activities of the State Water Project (SWP).
Appendix B contains data and computations used to determine the SWP water contractors’ Statements of Charges for 2018. Appendix B was previously printed and distributed to SWP water contractors to document and support calculation of contractors’ annual charges.
The Bulletin discusses significant events and issues that affected SWP management and operations from January 1, 2016, through December 31, 2016. Bulletin 132-17 also discusses water supply and delivery, Delta resources and environmental issues, local assistance programs, power resources, recreation, and financial analysis of the SWP.
Please note that the water delivery figures listed are accurate at the time of this publication, but small volumes of water may be reclassified over time pursuant to long-term water supply contract provisions. If your research requires more current data than were available at the time of publication, please consult the most recent edition of Bulletin 132, or contact Department of Water Resources staff in the State Water Project Analysis Office.
California Department of Water Resources (DWR) | June 1, 2017...
Summary
In 2006, the San Luis Field Division of the California Department of Water Resources' Division of Operations and Maintenance (O&M) began to see...
In 2006, the San Luis Field Division of the California Department of Water Resources' Division of Operations and Maintenance (O&M) began to see a reduction in flow capacity through the California Aqueduct (Aqueduct) Pools 20 and 21. Subsidence had lowered portions of the Aqueduct and caused the concrete liner freeboard (the vertical distance between the water surface and the top of the concrete liner) to be reduced from its normal of 3 feet, to less than 1 foot. Subsidence had also decreased the ability to store water in those pools, which is normally done to add operational flexibility and to manage pumping at the Aqueduct’s pumping plants.
While subsidence has reduced the amount of freeboard and flow capacity at specific locations, contracted deliveries have not been curtailed through 2016. Additional work, to be addressed in the next phase of the project, will quantify how hydraulic limitations have impacted operations and will estimate future impacts to deliveries, based on forecasted subsidence rates.
The purpose of this project is to research and study past and present subsidence reports and data, and to understand and summarize the magnitude, location, and effects on the Aqueduct. This report summarizes the significant information found, and presents the results of the data that were analyzed.
California Department of Water Resources (DWR) | June 20, 2007...
Summary
The State Water Project (SWP) provides drinking water to approximately two-thirds of California’s population and is the nation’s largest state-built water development project....
The State Water Project (SWP) provides drinking water to approximately two-thirds of California’s population and is the nation’s largest state-built water development project. The SWP extends from the mountains of Plumas County in the Feather River watershed to Lake Perris in Riverside County. It is linked with the Central Valley Project (CVP) that extends from southern Oregon in the Sacramento River watershed to the Mendota Pool.
The watershed of the SWP is vast; encompassing the 27,000-square-mile Sacramento River and 13,000-square-mile San Joaquin River watersheds and at times, the 13,000-square-mile Tulare Basin watershed. The contaminant sources in the SWP watersheds have been well documented in the three previous sanitary surveys. The California Department of Health Services (CDHS) requested that the 2006 Update address the Jones Tract levee failure and emergency response procedures, efforts to coordinate pathogen monitoring in response to the Long Term 2 Enhanced Surface Water Treatment Rule (LT2ESWTR), and a review of significant changes to the watersheds and their impacts on water quality. A Technical Review Committee (TRC) was formed to guide development of the scope of work and provide technical expertise and review of the draft report.
In addition to addressing the issues raised by CDHS, the TRC determined that the 2006 Update should focus on evaluating the sources of the water quality problems that the SWP Contractors face and recommending actions that the SWP Contractors can take that will lead to improvements in water quality over the next five years.
TABLE OF CONTENTS
CHAPTER 1 INTRODUCTION
CHAPTER 2 REGULATORY SETTING
CHAPTER 3 WATER QUALITY IN THE WATERSHEDS AND THE STATE WATER PROJECT
CHAPTER 4 KEY CONCERNS IN THE CENTRAL VALLEY WATERSHED AND THE DELTA
CHAPTER 5 KEY CONCERNS WITH STATE WATER PROJECT FACILITIES
CHAPTER 6 INCIDENTS AND EMERGENCY RESPONSE MEASURES
CHAPTER 7 CONCERNS WITH SYSTEM OPERATION AND MAINTENANCE
