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Program Element

Name of study: Lakos Screen Evaluation

Program manager:
Name: Katherine Wadsworth
Agency: Department of Water Resources
Address: 3251 S Street
Phone: (916) 227-0180


Determine the effectiveness of a Lakos Plum-Creek Self-Cleaning Fish Screen at reducing entrainment of juvenile and adult fish to a 16-inch agricultural diversion on Bacon Island.

Sources of Data:

Files containing data collected specifically for this program element are found under the Delta Agricultural Diversion Evaluation program element. Click this link to find out more about the data and/or to download files.

Geographic range: The 1993 and 1994 screen test took place in the central Delta on the eastern side of Bacon Island, adjacent to Middle River.

Period of Record: Sampled approximately once a week from June 3 through September 1, 1993, and April 26 through August 2, 1994.

Type of data collected:

Start and end time of sampling (Pacific standard time);
Surface specific conductance (uS/cm);
Temperature (degrees Fahrenheit);
Diverted water (meters cubed and acre-feet);
Flow (cubic feet per second);
Screen (non, on, off);
End of net (mesh live-box, wooden live-box, other);
Number of juvenile and adult fish


1993 and 1994 IEP Work Plans

Field Sampling:

Sampling for juvenile and adult fish was conducted with and without the screen approximately once a week during the summers of 1993 and 1994. The screen test consisted of sampling one hour under screened (screen up) conditions followed by one hour under screened (screen down) conditions. A fyke-type net (18" mesh) with live-box was placed directly over the diversion outfall to capture one hundred percent of the diverted water. Fish were identified to species, counted, and measured (TL mm). A flow meter (propeller typed, Ketma McCrometer model MO300) on the siphon measured diversion flow as cubic feet per second (cfs) and water volume diverted as acre-feet. The siphon readings were used to measure flow through the met and subsequently compute the volume of water sampled.