U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings
of the Technical Meeting, Colorado Springs, Colorado, September 20-24, 1993,
Water-Resources Investigations Report 94-4015
Hydrodynamics of California's Sacramento-San Joaquin Delta,
and the Collection of Flow Data for the Tracking of Pesticides
Richard N. Oltmann (U.S. Geological Survey, Sacramento, Calif.)
The Sacramento and San Joaquin Rivers drain the Central Valley of California
where 10 percent of the pesticides used in the United States are applied.
The two rivers converge at the head of San Francisco Bay, forming a complex
delta consisting of many interconnected sloughs and channels. The tracking
of pesticides within and through the delta is difficult because flows are
being manipulated constantly and measured-flow data are lacking. Ultrasonic
velocity meters and an acoustic Doppler flow-measuring system are being
used to collect the flow data necessary to improve understanding of the
hydrodynamics of the delta and to track pesticides entering the delta.