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Extensively modified over the last century and a half, California's San Francisco Bay Delta Estuary remains biologically diverse and functions as a central element in California's water supply system. Uncertainties about the future, actions taken under the federal Endangered Species Act (ESA) and companion California statues, and lawsuits have led to conflict concerning the timing and amount of water that can be diverted from the Delta for agriculture, municipal, and industrial purposes and concerning how much water is needed to protect the Delta ecosystem and its component species. Sustainable Water and Environmental Management in the California Bay-Delta focuses on scientific questions, assumptions, and conclusions underlying water-management alternatives and reviews the initial public draft of the Bay Delta Conservation Plan in terms of adequacy of its use of science and adaptive management. In addition, this report identifies the factors that may be contributing to the decline of federally listed species, recommend future water-supple and delivery options that reflect proper consideration of climate change and compatibility with objectives of maintaining a sustainable Bay-Delta ecosystem, advises what degree of restoration of the Delta system is likely to be attainable, and provides metrics that can be used by resource managers to measure progress toward restoration goals.
Water Policy and Planning in a Variable and Changing Climate addresses the current challenges facing western water planners and policy makers in the United States and considers strategies for managing water resources and related risks in the future. Written by highly-regarded experts in the industry, the book offers a wealth of experience, and explains the physical, socioeconomic, and institutional context for western water resource management. The authors discuss the complexities of water policy, describe the framework for water policy and planning, and identify many of the issues surrounding the subject. A provocative examination of policy issues surrounding western water resources, this book: Considers the implications of natural climate variability and anthropogenic climate change for the region’s water resources, and explains limitations on the predictability of local-scale changes Stresses linkages between climate patterns and weather events, and related hydrologic impacts Describes the environmental consequences of historical water system development and the challenges that climate change poses for protection of aquatic ecosystems Examines coordination of drought management by local, state and national government agencies Includes insights on planning for climate change adaptation from case studies across the western United States Discusses the challenges and opportunities in water/energy/land system management, and its prospects for developing climate change response strategies Presents evidence of changes in water scarcity and flooding potential in the region and identifies a set of adaptation strategies to support the long-term sustainability of irrigated agriculture and urban communities Draws upon Colorado’s experience in defining rights for surface and tributary groundwater use to explain potential conflicts and challenges in establishing fair and effective coordination of water rights for these resources Assesses the role of policy in driving flood losses Explores policy approaches for achieving equitable and environmentally responsible planning outcomes despite multiple sources of uncertainty Water Policy and Planning in a Variable and Changing Climate describes patterns of water availability, existing policy problems and the potential impacts of climate change in the western United States, and functions as a practical reference for the student or professional invested in water policy and management.
California's Bay-Delta estuary is a biologically diverse estuarine ecosystem that plays a central role in the distribution of California's water from the state's wetter northern regions to its southern, arid, and populous cities and agricultural areas. Recently, the Fish and Wildlife Service and the National Marine Fisheries Service required changes (reasonable and prudent alternatives, or RPAs) in water operations and related actions to avoid jeopardizing the continued existence and potential for recovery of threatened species of fish. Those changes have reduced the amount of water available for other uses, and the tensions that resulted have been exacerbated by recent dry years. The complexity of the problem of the decline of the listed species and the difficulty of identifying viable solutions have led to disagreements, including concerns that some of the actions in the RPAs might be ineffective and might cause harm and economic disruptions to water users, and that some of the actions specified in the RPAs to help one or more of the listed species might harm others. In addition, some have suggested that the agencies might be able to meet their legal obligation to protect species with less economic disruptions to other water users. The National Research Council examines the issue in the present volume to conclude that most of the actions proposed by two federal agencies to protect endangered and threatened fish species through water diversions in the California Bay-Delta are "scientifically justified." But less well-supported by scientific analyses is the basis for the specific environmental triggers that would indicate when to reduce the water diversions required by the actions.
This book presents a social science perspective on drought and water scarcity in the UK. It puts forward a narrative of how different stakeholders manage drought and water scarcity, how they generate and manage knowledge and how power relationships between stakeholders shape drought and water scarcity management. The book begins with an analysis and critique of all water resources management plans produced by English and Welsh water supply companies for the period 2014-2019 and introduces a novel typology for drought management options. It then moves on to discuss the effect of drought and water scarcity on businesses and production processes as well as how knowledge about drought and water scarcity is generated, by whom and for what purpose. Ultimately the book argues for the urgent need to engage people in the UK about water issues and offers a novel perspective on how to communicate and engage with drought research.
The Edwards Aquifer in south-central Texas is the primary source of water for one of the fastest growing cities in the United States, San Antonio, and it also supplies irrigation water to thousands of farmers and livestock operators. It is also is the source water for several springs and rivers, including the two largest freshwater springs in Texas that form the San Marcos and Comal Rivers. The unique habitat afforded by these spring-fed rivers has led to the development of species that are found in no other locations on Earth. Due to the potential for variations in spring flow caused by both human and natural causes, these species are continuously at risk and have been recognized as endangered under the federal Endangered Species Act(ESA). In an effort to manage the river systems and the aquifer that controls them, the Edwards Aquifer Authority and stakeholders have developed a Habitat Conservation Plan (HCP). The HCP seeks to effectively manage the river-aquifer system to ensure the viability of the ESA-listed species in the face of drought, population growth, and other threats to the aquifer. The National Research Council was asked to assist in this process by reviewing the activities around implementing the HCP. Review of the Edwards Aquifer Habitat Conservation Plan: Report 2 reviews the progress in implementing the recommendations from the Committee's first report, seeking to clarify and provide additional support for implementation efforts where appropriate. The current report also reviews selected Applied Research projects and minimization and mitigation measures to help ensure their effectiveness in benefiting the listed species.