Location
Agriculture Leaders Theater, Oregon State University
Start Date
25-6-2013 11:40 AM
End Date
25-6-2013 12:00 PM
Description
Civil structures built on the banks of rivers may replace natural riparian habitat with vertical concrete or steel walls. Examples include fish screens which are designed to have smooth faces to allow fish and debris to move past the screen. Internal bypasses can limit the time exposure of fish to the screen, but only when there is sufficient head to drive the bypass. NOAA Fisheries Service and other agencies are developing concepts for providing refugia areas along fish screens to allow smaller fish to escape the hydraulic influence of the diversion and predators that may take advantage of the lack of habitat at fish screens to prey on passing fish. Steve Thomas will present some of the refugia concepts being considered for larger fish screens on the Sacramento River in California.
Concurrent Sessions C: Fish Screening at Water Diversions I - Refugia for Juvenile Salmonids at Fish Screens
Agriculture Leaders Theater, Oregon State University
Civil structures built on the banks of rivers may replace natural riparian habitat with vertical concrete or steel walls. Examples include fish screens which are designed to have smooth faces to allow fish and debris to move past the screen. Internal bypasses can limit the time exposure of fish to the screen, but only when there is sufficient head to drive the bypass. NOAA Fisheries Service and other agencies are developing concepts for providing refugia areas along fish screens to allow smaller fish to escape the hydraulic influence of the diversion and predators that may take advantage of the lack of habitat at fish screens to prey on passing fish. Steve Thomas will present some of the refugia concepts being considered for larger fish screens on the Sacramento River in California.
Comments
Steve Thomas has been a hydraulic engineer with the National Marine Fisheries Service based in Santa Rosa, California since 1997. His has worked primarily on fish screen projects for the Central Valley Project’s Anadromous Fish Screen Program which provides assistance to water users needing fish screens or fish screen improvements on the Sacramento and San Joaquin Rivers and their tributaries. He monitors fish screen performance by inspecting screens using SCUBA and conducting hydraulic evaluations.