Keywords:coastal aquifers, conjunctive use, drought, Groundwater Exchange, groundwater recharge, planning and management, water supply
The primary goal of the North Coast Hydrologic Region (North Coast region) groundwater update is to expand information about region-specific groundwater conditions for...
The primary goal of the North Coast Hydrologic Region (North Coast region) groundwater update is to expand information about region-specific groundwater conditions for California Water Plan Update 2013, and to guide more informed groundwater management actions and policies.
A second goal is to steadily improve the quality of groundwater information in future California Water Plan (CWP) updates to a level that will enable regional water management groups (RWMGs) to accurately evaluate their groundwater resources and implement management strategies that can meet local and regional water resource objectives in the context of broader statewide objectives.
The final goal is to identify data gaps and groundwater management challenges that will guide prioritizing of future data collection and funding opportunities relevant to the region.
This regional groundwater update is not intended to provide a comprehensive and detailed examination of local groundwater conditions, or be a substitute for local studies and analysis.
Nonetheless, where information is readily available, this update does report some aspects of the regional groundwater conditions in greater detail.
Ground water management is a major issue in California. The Governor's Commission to Review California Water Rights Law, in its December 1978 report,...
Ground water management is a major issue in California. The Governor's Commission to Review California Water Rights Law, in its December 1978 report, recommends a new ground water management law for California. During the 1978 and 1979 sessions of the California Legislature, similar bills were introduced but to date the only related legislation enacted was S8 1505 (Nejed1y, 1978) which directed the Department to identify the ground water basins of the State, including those subject to critical conditions of overdraft. Basins are to be identified on the basis of geological and hydrological conditions and consideration of political boundary lines whenever practical.
The ground water basin boundaries in this report can provide a basis for ground water management, should the Legislature enact such a program.
New ground water management legislation is needed. While some local agencies are managing ground water effectively with the limited powers available to them, increased authority would permit more extensive local development and implementation of plans for management of the storage space in the underlying ground water basin, ground water extraction, and artificial recharge.
Ground water management is an institutional and a political process. The ground water basin boundaries identified in this report respond in large part to the views of agencies expressed in the workshops and public hearings.
Three hundred fifty seven ground water basins are identified in this report as shown in Bulletin 118, California's Groundwater, 1975. Thirty-seven basin boundaries differ from those in Bulletin 118 (1975). Of these, twenty-two were in accord with local agency comments, and three were selected from among conflicting local comments. Pursuant to Section 10004 of the California Water Code, this report is submitted to the Legislature and shall become part of the California Water Plan.
Conjunctive management or conjunctive use refers to the coordinated and planned use and management of both surface water and groundwater resources to maximize...
Conjunctive management or conjunctive use refers to the coordinated and planned use and management of both surface water and groundwater resources to maximize the availability and reliability of water supplies in a region to meet various management objectives. Surface water and groundwater resources typically differ significantly in their availability, quality, management needs, and development and use costs. Managing both resources together, rather than in isolation, allows water managers to use the advantages of both resources for maximum benefit. Conjunctive management thus involves the efficient use of both resources through the planned and managed operation of a groundwater basin and a surface water storage system combined through a coordinated conveyance infrastructure.
Water is stored in the groundwater basin that is planned to be used later by intentionally recharging the basin when excess water supply is available, for example, during years of above-average surface water supply or through the use of recycled water. The necessity and benefit of conjunctive water management are apparent when surface water and groundwater are hydraulically connected. Well-planned conjunctive management that prevents groundwater depletion by maintaining baseflow to streams and support for ecosystem services not only increases the reliability and the overall amount of water supply in a region, but also provides other benefits such as flood management, environmental water use, and water quality improvement.
A new era for California’s groundwater began in September 2014 with the passage of the Sustainable Groundwater Management Act (SGMA). SGMA established a...
A new era for California’s groundwater began in September 2014 with the passage of the Sustainable Groundwater Management Act (SGMA). SGMA established a path for the sustainable management of groundwater through the formation of locally organized groundwater sustainability agencies and locally developed groundwater sustainability plans.
The purpose of this interim update is to provide up-to-date information on groundwater basins subject to critical conditions of overdraft, groundwater basin boundaries, and basin prioritization. That information is essential to the successful implementation of SGMA, including the timely formation of groundwater sustainability agencies and the development of groundwater sustainability plans.