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: 139
Date published: November 15, 2018
Status: Active

Dynamics of zooplankton in the Cache Slough Complex

Our purpose is to investigate what controls the distribution and abundance of fish prey within the Cache Slough Complex (CSC).

Date published: November 14, 2018
Status: Completed

Phytoplankton production and nutrient transformations in shallow water wetland habitats

The objectives of this study are to quantify and characterize (1) phytoplankton production on Liberty Island, (2) utilization and transformation of nutrients, and (3) attenuation/loss of phytoplankton as the material is transported from Liberty Iisland into Cache Slough.

Date published: November 14, 2018
Status: Active

Assessment of methyl mercury (MeHg) release from sediment formed in wetland treatment cells designed to remove mercury from surface waters using in situ coagulation

Our objective is to determine the relative propensity of sediment material formed under two different in situ coagulation treatments (iron sulfate, polyaluminum chloride) to release MeHg into surface waters under environmentally relevant conditions that may affect flocculant stability and MeHg production rates.

Contacts: Jacob A Fleck
Date published: November 14, 2018
Status: Completed

Decadal-scale water-quality trends in California's public-supply aquifers: Pilot study in two priority basins

This project will contribute to the USGS Strategic Science Plan objective of developing a Water Census to inform decision-makers and the public about the status of groundwater resources and how they are changing, and forecasts of future changes in groundwater quality, and supports the Cooperative Water Program priority of assessing the quality of drinking water supplies for the protection of...

Contacts: Miranda Fram
Date published: November 13, 2018
Status: Active

Science Programs and Partnerships

The USGS partners with local, state, and other federal agencies through cooperative agreements for a variety of reasons. The USGS and partners jointly plan the scientific work conducted under cooperative agreements resulting in science that has broad relevance to address current water issues. Partners choose...

Date published: November 8, 2018
Status: Active

Hydrologic Modeling Software

The USGS has been a leader in the development of hydrologic and geochemical simulation models since the 1960's. USGS models are widely used to predict responses of hydrologic systems to changing stresses, such as increases in precipitation or ground-water pumping rates, as well as to predict the fate and movement of solutes and contaminants in water.

Date published: November 7, 2018
Status: Active

Mojave Land-Subsidence Studies

Land subsidence has been ongoing in the dry lake beds throughout the Mojave and Morongo groundwater basins since the 1960s. In a study conducted from 2004 - 2009, continuous GPS stations were added to interferometric synthetic aperture radar (InSAR) methods to measure changes in land surface altitude.

Date published: November 7, 2018
Status: Completed

Comprehensive Mercury Studies

The objective specific to work conducted by the CAWSC is to produce a continuous time-series of suspended-sediment flux at an existing site in Alviso Slough.

Date published: November 7, 2018
Status: Active

Land Subsidence in the Coachella Valley

Groundwater is an important water-supply source in the Coachella Valley. The demand for water has exceeded the deliveries of imported surface water, and groundwater levels have been declining as a result of increased pumping. A network of GPS stations has been set up in the valley to monitor subsidence resulting from declining groundwater levels.

Contacts: Michelle Sneed
Date published: November 6, 2018
Status: Active

San Antonio Reservoir Bathymetric Survey and Sedimentation Study

Over time, the flow of water into the San Antonio Reservoir has caused the build-up of sediment, decreasing storage capacity. Since water storage is a crucial issue in California, up-to-date information on the reservoir is needed.  To accomplish this, the San Francisco Public Utilities Commission approached the USGS California Water Science Center to conduct a bathymetric (depth) survey and...

Date published: November 6, 2018
Status: Active

Delta-Mendota Canal: Using Groundwater Modeling to Analyze Land Subsidence

A numerical modeling approach was used to quantify groundwater conditions and land subsidence spatially along the Delta-Mendota Canal. In addition, selected management alternatives for controlling land subsidence were evaluated.

Date published: November 5, 2018
Status: Completed

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

his study will provide an analysis tool for forecasting seasonal and longer term streamflow variations, and for evaluating climate and land cover variations in the Kings River Basin. This study will directly or indirectly address several water-resource issues identified in the USGS Science Strategy document (USGS, 2007): drinking water availability, the suitability of aquatic habitat for biota...

Contacts: Kathryn Koczot