Yakima River Basin Phase II Fish Screen Evaluations, 2002

Carter, Jessica A. ; McMichael, Geoffrey A. ; Chamness, Mickie A.

Pacific Northwest National Laboratory (U.S.)

关键词: Bonneville Power Administration;    Flow Rate;    Juveniles;    Maintenance;    Fisheries;   

DOI  :  10.2172/877088
RP-ID  :  PNNL-14205
RP-ID  :  AC05-76RL01830
RP-ID  :  877088

美国|英语

来源: UNT Digital Library

【 摘 要 】

In 2002, the Pacific Northwest National Laboratory evaluated 23 Phase II fish screen sites in the Yakima River Basin as part of a multi-year project for the Bonneville Power Administration on the effectiveness of fish screening devices. Pacific Northwest National Laboratory collected data to determine whether velocities in front of the screens and in the bypasses met National Marine Fisheries Service criteria to promote safe and timely fish passage and whether bypass outfall conditions allowed fish to safely return to the river. In addition, Pacific Northwest National Laboratory conducted underwater video surveys to evaluate the environmental and operational conditions of the screen sites with respect to fish passage. Based on evaluations in 2002, PNNL concluded that: (1) In general, water velocity conditions at the screen sites met fish passage criteria set by the National Marine Fisheries Service. (2) Conditions at most facilities would be expected to provide for safe juvenile fish passage. (3) Conditions at some facilities indicate that operation and/or maintenance should be modified to increase safe juvenile fish passage. (4) Automated cleaning brushes generally functioned properly; chains and other moving parts were typically well greased and operative. (5) Removal of sediment buildup and accumulated leafy and woody debris should be improved at some sites.