California Water Science Center

Measuring and Monitoring

Basic hydrologic data collection, processing, analysis, dissemination, and archiving are major parts of the California Water Science Center program. Streamflow data, for example, are used for flood and water-supply forecasts, planning and design, river regulation, streamflow statistics, and research investigations. Much of the data are available on a near-real-time basis by satellite telemetry.

Filter Total Items: 136
Date published: December 19, 2018
Status: Completed

Quantification of Mercury Flux in Eroding Mining Debris, Yuba River Watershed, California

At two priority locations on BLM-administered land in the Yuba River watershed, the USGS has documented relatively rapid erosion of river bank material that consists of mercury (Hg)-laden sediment with a significant component of mining debris. 

Date published: December 19, 2018
Status: Completed

Depth-dependent Sample Collection for Perchlorate Isotopes

Chlorine and oxygen isotopic analyses of perchlorate have shown that perchlorate from agricultural and industrial (synthetic) sources is present in the Bunker Hill Groundwater Basin downgradient of the former Lockheed Propulsion Company (LPC) Site near Redlands, Calif., about 60 miles east of Los Angeles. Although agricultural and synthetic plumes merge in the central portion of the Bunker...

Contacts: John Izbicki
Date published: December 19, 2018
Status: Completed

Shallow Aquifer Assessment Study for the Monterey Bay and Salinas Valley

High nitrate and trace element concentrations in groundwater represent a health threat to domestic well users. The concentrations and distributions of these constituents in shallow groundwater in the Salinas Valley of the central coast of California are poorly understood, and communities are concerned about the quality of their drinking water. 

Date published: December 19, 2018
Status: Completed

Relation of Groundwater Age to Herbicide Concentration Trends in Fresno and Tulare Counties, California

The California Department of Pesticide Regulation (DPR) has been monitoring pesticide concentrations in about 70 domestic drinking water wells located in vulnerable areas of Fresno and Tulare Counties for approximately 15 years. A recent analysis of the monitoring data indicated that there were decreases in simazine, diuron, and bromacil concentrations in many wells during 2000-2010.

Date published: December 19, 2018
Status: Completed

Technical Support to the U.S. EPA for Leviathan Mine, Alpine County, California

The Leviathan Mine, located in Alpine County is one of the worst sites in California for acid mine drainage. The site is on the National Priority List for CERCLA (Superfund) (U.S. EPA, 2011) and U.S. EPA is working with ARCO/BP (the Responsible Party) on designing and implementing site remediation. The USGS did research there during the 1980s on geochemistry (e.g., Nordstrom and Ball, 1986)....

Date published: December 19, 2018
Status: Completed

Evaluation of water resources in Chuckwalla Valley, Riverside County, California

The Chuckwalla Valley in the southern Mojave Desert in California has been selected as an area with high potential for solar energy development. Six large-scale solar energy projects are currently approved or proposed in this basin, the largest number of solar projects in any one basin in California. Water needs associated with proposed solar energy projects within the basin have generated...

Contacts: Rhett R Everett
Date published: December 19, 2018
Status: Completed

Optimization of Operation of Yuma Area Drainage and Regulatory Wells - Pilot Project

Reclamation's Yuma Area Office (YAO) operates 50 plus drainage wells and 21 regulatory wells to control groundwater levels in low-lying flood plain areas and to supply a significant portion of the Colorado River water the United States (US) is required by treaty to deliver to Mexico.

Date published: December 19, 2018
Status: Completed

Determining the fate and transport of septic-tank effluent in the southern area of Warren subbasin, California

Residents and businesses in Yucca Valley, CA rely currently on septic tanks to treat their wastewater. The local water district, Hi-Desert Water District (HDWD), is planning to construct a sewer system and wastewater treatment plant, initially serving the West, Midwest, Mideast, Northeast, and East hydrogeologic units of the Warren subbasin.

Date published: December 19, 2018
Status: Completed

Sonoma Valley Surface Water/Groundwater-Flow Model

Sonoma County faces potential changes in surface-water availability, including potential impacts on water quality in response to changing land use, increasing population, and climate change.

Contacts: Tracy Nishikawa
Date published: December 18, 2018
Status: Active

Water-Level, Water-Quality and Land-Subsidence Studies in the Mojave River and Morongo Groundwater Basins

Groundwater has been the primary source of domestic, agricultural, and municipal water supplies in the southwestern Mojave Desert, California, since the early 1900s. The population of the Mojave River and Morongo groundwater basins has grown rapidly during the last several decades, increasing from an estimated population of almost 273,000 in 1990 (...

Date published: December 18, 2018
Status: Completed

Pesticide Studies in the Sacramento/San Joaquin Delta and San Francisco Bay Estuary

The objectives of this specific study are to characterize the mixtures of current-use pesticides and pesticide degradates entering the Sacramento/San Joaquin Delta from its two main river sources over a period of 12 consecutive months. 

Contacts: James Orlando
Date published: December 17, 2018
Status: Completed

Delta sediment measurements to support numerical modeling of turbidity

The purpose of the proposed work is to collect data that will support the development, calibration, and validation of numerical models of sediment transport and turbidity in the Sacramento-San Joaquin Delta. 

Contacts: Scott A Wright