Category: Tools and Data

CA Nevada River Forecast Center

February 13, 2023 No Comments

NWS has played a key role in protecting American lives and properties for over a century. The timely provision of reliable weather, water, climate, and environmental information has supported the Nation’s social and economic development. NWS offices in communities across the United States and its territories, supported by regional and national centers, provide the authoritative information needed by Americans, including national, regional, state, tribal, and local authorities, to plan, prepare, mitigate, and respond to natural and human-caused events.

ICONS: Interconnected Surface Water in California’s Central Valley

February 2, 2023 No Comments

Sustainable groundwater management in California requires an understanding of how groundwater pumping affects surface water features. Groundwater seeps into many river and lake beds in California, providing a steady source of cool clean water. This source of water is crucial for people and nature because it remains steady throughout the year even after the winter rains stop. Under the Sustainable Groundwater Management Act (SGMA),
interconnected surface water (ISW) is defined as “surface water that is hydraulically connected at any point by a continuous saturated zone to the underlying aquifer and the overlying surface water is not completely depleted” (Groundwater Sustainability Plan Emergency Regulations).

SGMA requires special treatment of ISW, but in many parts of the state, ISW is poorly understood. This dataset categories rivers and stream segments on the likelihood that they are ISW, using groundwater depth as a proxy to determine ISW. This data is available to view in an interactive online map at: http://icons.codefornature.org/.

GAMA: Groundwater Ambient Monitoring and Assessment Program

February 2, 2023 No Comments

The State Water Board GAMA Program and the U.S. Geological Survey have created tools to help users understand groundwater quality in California. A range of online tools allow users to access data through web maps and data querying tools.

SGMA Data Viewer

February 2, 2023 No Comments

As part of DWR’s technical assistance to Groundwater Sustainability Agencies (GSAs), other water managers, and the public, DWR has developed the SGMA Data Viewer. The SGMA Data Viewer provides access to groundwater-related datasets that are organized by the requirements of SGMA and the Groundwater Sustainability Plan (GSP) regulations for the purposes of supporting GSP development and implementation.

Currently, regional and statewide groundwater information is publicly available, however this information is collected and disseminated through a variety of portals and applications. The SGMA Data Viewer provides centralized data access that will improve coordination across the State and help GSAs meet the requirements of SGMA and the GSP regulations.

This site includes historical and current data on:
Groundwater levels
Groundwater storage
Water quality
Land subsidence
Interconnected surface water
Water budgets
Hydrogeological conceptual models
Reference layers

Soil Agricultural Groundwater Banking Index

January 20, 2023 No Comments

The Soil Agricultural Groundwater Banking Index (SAGBI) is a suitability index for groundwater recharge on agricultural land. The SAGBI is based on five major factors that are critical to successful agricultural groundwater banking: deep percolation, root zone residence time, topography, chemical limitations, and soil surface condition.

California DWR Airborne Electromagnetic Surveys

January 18, 2023 No Comments

The Department of Water Resources is conducting airborne electromagnetic (AEM) surveys in California’s high- and medium-priority groundwater basins, where data collection is feasible, to assist local water managers as they implement the Sustainable Groundwater Management Act (SGMA) to manage groundwater for long term sustainability.

The AEM project provides state and federal agencies, groundwater sustainability agencies (GSAs), stakeholders, and the public with basin-specific and cross-basin geophysical data, tools, and analyses.

The surveys are funded by voter-approved Proposition 68, Senate Bill 5, and from the general fund. More information can be found in the AEM Proposition 68 Fact Sheet.

During an AEM survey, a helicopter tows electronic equipment that sends signals into the ground which bounce back. The process has been compared to taking an MRI of the ground’s subsurface. The data collected is used to create continuous images that are interpreted for underground geology.

The resulting information will provide a standardized, statewide dataset that improves the understanding of aquifer structures. It can also help with the development or refinement of hydrogeologic conceptual models and can help identify areas for recharging groundwater.