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Achieving State Goals for the Sacramento-San Joaquin Delta
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Achieving State Goals for the Sacramento-San Joaquin Delta
Legislative Analyst's Office | January 15, 2015...
Summary
The Sacramento-San Joaquin Delta (Delta) is a biodiverse ecosystem that covers about 1,150 square miles and supports over 700 species of fish and...
The Sacramento-San Joaquin Delta (Delta) is a biodiverse ecosystem that covers about 1,150 square miles and supports over 700 species of fish and wildlife. The Delta is an important source of water for the state and is used to convey water from Northern California to Southern California. The Delta faces several significant problems, including: (1) a decline in key native fish species, (2) reductions in the amount of Delta water available for use elsewhere, (3) water pollutants that cause harm to species and increase treatment costs, and (4) levees at significant risk of failure. The state has engaged in numerous efforts to address these problems and achieve its "coequal goals" for the Delta: water supply reliability and ecosystem restoration. There are many opportunities for the Legislature to improve the success of these efforts. We identified several issues for its consideration, including (1) demands for Delta water, (2) uncertain funding sources and slow implementation of some key activities, (3) limits on the effectiveness of governance in the Delta, and (4) challenges to restoring the Delta ecosystem. By addressing some of these issues, the Legislature can improve the likelihood that its goals and objectives for the Delta will be realized.

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Adaptability and adaptations of California’s water supply system to dry climate warming

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Adaptability and adaptations of California’s water supply system to dry climate warming
Climactic Change, Springer | November 27, 2007...
Summary
Economically optimal operational changes and adaptations for California’s water supply system are examined for a dry form of climate warming (GFDL CM2.1 A2)...
Economically optimal operational changes and adaptations for California’s water supply system are examined for a dry form of climate warming (GFDL CM2.1 A2) with year 2050 water demands and land use. Economically adaptive water management for this climate scenario is compared to a similar scenario with the historical climate. The effects of population growth and land use alone are developed for comparison. Compared with the historic hydrology, optimized operations for the dry climate warming scenario raise water scarcity and total operation costs by $490 million/year with year 2050 demands. Actual costs might be somewhat higher where non-economic objectives prevail in water management. The paper examines the economical mix of adaptation, technologies, policies, and operational changes available to keep water supply impacts to such modest levels. Results from this screening model suggest promising alternatives and likely responses and impacts. Optimized operations of ground and surface water storage change significantly with climate. Dry-warm climate change increases the seasonal storage range of surface reservoirs and aquifers. Surface reservoir peak storage usually occurs about a month earlier under dry-warm climate change.

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Advancing Hydro-Economic Optimization to Identify Vulnerabilities and Adaptation Opportunities in California’s Water System

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Advancing Hydro-Economic Optimization to Identify Vulnerabilities and Adaptation Opportunities in California’s Water System
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.

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Approaches for groundwater management in times of depletion and regulatory change

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Approaches for groundwater management in times of depletion and regulatory change
University of California, Davis (UC Davis) | June 1, 2018...
Summary
New legislation and related regulations in California mandate groundwater management to avoid undesirable results from excessive groundwater pumping and other human activities. Required...
New legislation and related regulations in California mandate groundwater management to avoid undesirable results from excessive groundwater pumping and other human activities. Required aspects of management planning that will occur in well over 100 alluvial groundwater sub-basins across the state include scientific foundation and public transparency. While the details of individual groundwater management approaches will be particular to conditions in each management area, there will be common elements based on similar aspects of many groundwater systems in the state.

The process of beginning to implement groundwater management for a large part of the state poses challenges. Use of scientific knowledge and methods of analysis developed in academia and industry will be helpful to the overall effort. This dissertation considers aspects of groundwater management that are expected to be common among many planning efforts.

Inactive water supply wells acting as conduits for contaminant migration is considered through field examples and use of recently available databases regarding existing well constructions and water quality. Nonpoint source pollution effects on groundwater quality from conduit wells are investigated and selective regulatory action is explored as an option for addressing an issue that is too large for complete solution with available resources.

Options for managed aquifer recharge are explored for a combined urban-agricultural area through use of a recently released land use database. A hydro-economic analysis is performed using linear programming to evaluate the efficacy of an on-farm recharge approach.

Future work may include development of additional insights within the context of the study areas presented as well as extensions that consider new geographic areas and additional related considerations.
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Atmospheric rivers drive flood damages in the western United States

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Atmospheric rivers drive flood damages in the western United States
Science Advances, American Association for the Advancement of Science (AAAS) | December 4, 2019...
Summary
Atmospheric rivers (ARs) are extratropical storms that produce extreme precipitation on the west coasts of the world’s major landmasses. In the United States, ARs...
Atmospheric rivers (ARs) are extratropical storms that produce extreme precipitation on the west coasts of the world’s major landmasses. In the United States, ARs cause significant flooding, yet their economic impacts have not been quantified. Here, using 40 years of data from the National Flood Insurance Program, we show that ARs are the primary drivers of flood damages in the western United States. Using a recently developed AR scale, which varies from category 1 to 5, we find that flood damages increase exponentially with AR intensity and duration:

Each increase in category corresponds to a roughly 10-fold increase in damages. Category 4 and 5 ARs cause median damages in the tens and hundreds of millions of dollars, respectively. Rising population, increased development, and climate change are expected to worsen the risk of AR-driven flood damage in future decades.

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Benefit-Cost Analysis of The California WaterFix
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Benefit-Cost Analysis of The California WaterFix
University of the Pacific, Center for Business and Policy Research | August 17, 2016...
Summary
This benefit - cost analysis of the California Water Fix was prepared by Dr. Jeffrey Micheal with the University of the Pacific Center...
This benefit - cost analysis of the California Water Fix was prepared by Dr. Jeffrey Micheal with the University of the Pacific Center for Business and Policy Research; Dr. Michael is an opponent of the project.

He writes, "This analysis is based on data and assumptions in the revised environmental documents produced by DWR to support the proposal’s environmental review. The results show the WaterFix costs are four times larger than its benefits, and thus the project is not is not economically justified."

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Bulletin No. 13, South Coastal Basin Investigation, Value and Cost of Water for Irrigation in Coastal Plain of Southern California

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Bulletin No. 13, South Coastal Basin Investigation, Value and Cost of Water for Irrigation in Coastal Plain of Southern California
California Department of Water Resources (DWR) | June 1, 1933...
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Bulletin No. 18, San Luis Obispo County Investigation, Volume II, Appendixes

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Bulletin No. 18, San Luis Obispo County Investigation, Volume II, Appendixes
California Department of Water Resources (DWR) | May 1, 1958...
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Bulletin No. 20, Report on Kennett Reservoir Development, An Analysis of Methods and Extent of Financing by Electric Power Revenue

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Bulletin No. 20, Report on Kennett Reservoir Development, An Analysis of Methods and Extent of Financing by Electric Power Revenue
State of California (California) | October 23, 1928...
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Bulletin No. 21-H, Report on Irrigation Districts in California for the Year 1936

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Bulletin No. 21-H, Report on Irrigation Districts in California for the Year 1936
California Department of Water Resources (DWR) | September 1, 1937...
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Achieving State Goals for the Sacramento-San Joaquin Delta

Achieving State Goals for the Sacramento-San Joaquin Delta

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Adaptability and adaptations of California’s water supply system to dry climate warming

Adaptability and adaptations of California’s water supply system to dry climate warming

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Advancing Hydro-Economic Optimization to Identify Vulnerabilities and Adaptation Opportunities in California’s Water System

Advancing Hydro-Economic Optimization to Identify Vulnerabilities and Adaptation Opportunities in California’s Water System

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Approaches for groundwater management in times of depletion and regulatory change

Approaches for groundwater management in times of depletion and regulatory change

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Atmospheric rivers drive flood damages in the western United States

Atmospheric rivers drive flood damages in the western United States

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Benefit-Cost Analysis of The California WaterFix

Benefit-Cost Analysis of The California WaterFix

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Bulletin No. 13, South Coastal Basin Investigation, Value and Cost of Water for Irrigation in Coastal Plain of Southern California

Bulletin No. 13, South Coastal Basin Investigation, Value and Cost of Water for Irrigation in Coastal Plain of Southern California

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Bulletin No. 18, San Luis Obispo County Investigation, Volume II, Appendixes

Bulletin No. 18, San Luis Obispo County Investigation, Volume II, Appendixes

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Bulletin No. 20, Report on Kennett Reservoir Development, An Analysis of Methods and Extent of Financing by Electric Power Revenue

Bulletin No. 20, Report on Kennett Reservoir Development, An Analysis of Methods and Extent of Financing by Electric Power Revenue

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Bulletin No. 21-H, Report on Irrigation Districts in California for the Year 1936

Bulletin No. 21-H, Report on Irrigation Districts in California for the Year 1936

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