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 4, 2018
Status: Completed

Sources of Disinfection Byproduct-forming Material in the State Water Project

Water from the Sacramento-San Joaquin Delta contains high concentrations of disinfection byproduct-forming (DBP-forming) materials when treated for potable use. DBPs form when dissolved organic compounds (DOC) in water react with disinfectants such as chlorine and ozone during the water-treatment process. The amount of DBPs that form is a function of the amount and source of the DOC, both of...

Date published: December 4, 2018
Status: Active

Geohydrologic Study of the Central and West Coast Basins of Los Angeles County

Using the new information, along with the recently acquired seismic reflection data, USGS scientists and co-workers have been able to develop a much more detailed understanding of the stratigraphy and structure of the Central and West Coast Basins.

Date published: December 3, 2018
Status: Active

A Non-Point Source Of Contaminants To The Estuarine Food Web: Mobilized Particles From The Intertidal Zone

The San Francisco Bay and Sacramento-San Joaquin Delta (Bay-Delta) region is a highly urbanized and contaminated estuary with a valuable commercial and recreational fishery (Nichlos et al., 1986; SFEI, 2004). Many fish and birds in the San Francisco Estuary exhibit high levels of contaminants (metals and organic pollutants), which have been shown to affect their behavior and reproductive...

Contacts: Jacob A Fleck
Date published: November 28, 2018
Status: Active

Warren Subbasin Groundwater Recharge

The Hi Desert Water District (HDWD) provides water service to about 10,000 customers in the areas of Yucca Valley, Yucca Mesa, and some unincorporated areas of San Bernardino County. The study area is the 19 square mile Warren subbasin of the Morongo groundwater basin (approximately 100 miles east of Los Angeles, California).

Date published: November 28, 2018
Status: Completed

Estimating Groundwater Withdrawals and Consumptive Use for Principal Aquifers

The USGS works in cooperation with local, State, and Federal agencies to compile and disseminate data on the Nation's water use. The annual water-use estimates are reported at the county, State, and national levels and provide fundamental input to regional hydrologic models. These estimates commonly represent the largest stresses in most aquifers and are needed by local managers to steward the...

Date published: November 26, 2018
Status: Completed

Methylmercury cycling and export from agricultural and natural wetlands in the Yolo Bypass

The purpose of the work conducted by the USGS California Water Science Center is to help guide Yolo Wildlife Area management practices by identifying the relationships between management effects on dissolved organic matter properties and the resulting role of dissolved organic matter in mercury methylation and biotic uptake measured by the cooperating USGS scientists. The information gathered...

Contacts: Jacob A Fleck
Date published: November 26, 2018
Status: Completed

Investigation of Linkages Between Management Practices Used in Sacramento-San Joaquin Delta Rice Production and Loads of Dissolved Organic Matter and Disinfection Byproduct Precursors

The primary objective of this study is to expand our current understanding of how to manage rice production in the Sacramento-San Joaquin Delta in a manner that minimizes loads of water quality contaminants to Delta waters.

Contacts: Jacob A Fleck
Date published: November 26, 2018
Status: Completed

Assessing the Feasibility of Artificial Recharge and Storage and the Effectiveness and Sustainability of Insitu Arsenic Removal in the North Buttes Area, Antelope Valley, California

Groundwater pumpage for agricultural and municipal supply has resulted in water-level declines of more than 200 ft in some parts of the Antelope Valley groundwater basin and land subsidence of more than 6 ft in some areas. Future urban growth, increased agricultural demand, and limits on the supply of imported water will continue to increase the demand for groundwater.

Contacts: Tracy Nishikawa
Date published: November 26, 2018
Status: Completed

The effects of artificially recharging treated municipal wastewater on ground-water levels and quality, Antelope Valley, California

Study Area Location.

Ground-water pumpage for agricultural and municipal supply has resulted in water-level declines of more than 200 ft in some parts of the Antelope Valley ground-water basin and land subsidence of more than 6 ft in some areas. Future urban growth, increased agricultural demand, and limits on the supply of imported water will continue to increase the demand for ground...

Contacts: Claudia C Faunt
Date published: November 26, 2018
Status: Completed

Geohydrology of the Big Bear Valley

The study develops a greater understanding of the hydrology of the Big Bear Valley ground-water basin and allows the Big Bear Valley Community Services District to better manage and utilize the resource. The study will address the effects of urbanization and suburbanization on water resources and the effects of climate on water resources, issues 1 and 7 from the Strategic Directions for the...

Date published: November 26, 2018
Status: Completed

Central Basin Groundwater Contamination Study

The Central and West Coast groundwater basins provide nearly a third of the water supply to 43 cities in southern Los Angeles County. Over 250,000 afy are pumped from the basins for municipal and industrial use. To properly manage the ground-water resource and to ensure its future availability, it is necessary to identify and manage threats to the drinking water aquifers from surface...

Contacts: Michael T Land
Date published: November 26, 2018
Status: Completed

Development of Precipitation-Runoff Modeling System (PRMS) for the Yuba River Basin, Northeastern California, with application for streamflow predictability and flood forecasting

Reservoirs in the Yuba River Basin are operated by the US Army Corps of Engineers (USACE) as part of the Feather-Yuba Forecast Coordinated Operations Program, and play an important role in flood management, water quality, and the health of fisheries as far downstream as the Sacramento-San Joaquin Delta. The basin has been developed for hydropower and irrigation diversions, so that measured...

Contacts: Kathryn Koczot