Bonneville Washington Shore Fishladder Proposed Entrance Modification for Lamprey at North Downstream Entrance (NDE) Natalie Richards - Project Manager.

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Presentation transcript:

Bonneville Washington Shore Fishladder Proposed Entrance Modification for Lamprey at North Downstream Entrance (NDE) Natalie Richards - Project Manager Kristy Fortuny - Technical Lead Mike Langeslay - Biologist Sean Tackley - Biologist Stephen Schlenker - Hydraulic Engineer Portland District FFDRWG Meeting - Jan 7, 2010

Goals of Proposed Project Improve adult lamprey passage at Bonneville Washington Shore Fishladder (Bonn WA) Do not compromise salmon passage Provide lower velocity and flush, or rounded, surface corridor for lamprey passage at NDE

Design Update 11/24/09 FFDRWG – Alternate entrance weir – Presented Alternative 1 – Fixed Weir and Bollards CFD Results - Weak surface jet and bollards do not sufficiently slow flow Insufficient entrance head drop with existing water supply Team tasked to investigate an alternate entrance weir and a separate lamprey entrance Alternate entrance weir – 3 piece weir required - cumbersome operation Poor approach for lamprey May not provide desired hydraulic results More investigation required to determine feasibility Team pursuing a separate lamprey entrance - “Alternative 4” Construct during 2010-2011 In Water Work Period

Alternative 4 Separate Lamprey entrance and system Piped flow feeds rectangular lamprey entrances that span entrance opening Entrance velocity ≈ 2 ft/s Entrances at two different levels Elevation 0 ft Elevation -16 ft Upper entrance goes through south wall to trap & haul/LPS Water supplied by ERC Screened for juvenile fish and debris

Alternative 4

Alternative 4 Details Plan View 53 cfs

Alternative 4 Details Section A-A Looking Upstream

Upper Lamprey Entrance Collection Box

Alternative 4 Details

Alternative 4 Details

QUESTIONS?