year 6 major focus · • operational dam modification “the notch” not a long term solution •...
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Year 6 Major Focus • Overview
• Final Dry Creek Tributary Project
• Temporary Urgency Change Petition
• Fish Flow draft Environmental Impact
Report
• Fish Screen and Ladder Replacement
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www.sonomacountywater.org
Mirabel Fish Screen & Ladder Replacement PPFC Update
Steve Koldis Water Agency Engineer
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www.sonomacountywater.org
• Status • Background • Design • Challenges • Timing
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Mirabel Site - Background • River Diversion Structure
(RDS) and Dam built in 1975 • Vital for Summer Water
Supply • 2008 BO, Fish Screens Do
Not Meet Criteria • Fish Ladders Not Effectively
Passing Juvenile Fish Downstream
• Operational Dam Modification “The Notch” not a long term solution
• 2008 Seismic Hazard Assessment
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Existing Fish Screens
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Notch in Rubber Dam
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Earthquake Hazard
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Design Features
• New Fish Screen • Flat Vertical Screen –
Integrated with Ladder
• New Fish Ladder • Vertical Slot Design • More Flow, Better
Passage • Seismic Stability
Improvements • Vibratory Stone Columns
• Public Education • Fish Viewing Gallery
• Fisheries Monitoring • Video, Trapping, Tag
Detection
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Vertical Slot Fish Ladder
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Site Plan
Auxiliary Water Supply
Screen Ladder
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Challenges – Dewatering
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Temporary Coffer Dam
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Schedule • 5/27/2014 Ground
Stabilization Work Complete
• 1/30/2014 Ladder & Screen Advertisement
• 3/4/2014 Bids Due • 6/2014 Contract Time
Starts • 2 Construction Seasons • Construction End Date
December 2015
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Acknowledgments
• CDFW – FRGP – $255k for Design – $1.18 M for
Construction of the fish ladder
• HDR, Inc. • Prunuske Chatham, Inc.
• TAC – Marcin Whitman, CDFW – Derek Acomb, CDFW – Ryan Watanabe, CDFW – Steven Thomas, NMFS – Rick Rogers, NMFS