The state-of-the-art of estimating extreme floods is evolving as scientists learn more about climate, precipitation, runoff and floods.  Periodic re-evaluation of extreme floods at existing dams can necessitate spillway capacity upgrades.

In addition, FERC relicensing of existing hydro plants has resulted in increases to flow releases from reservoirs to protect riparian habitat, fish habitat and streambed morphology.  As a result many owners are now faced with the challenge of increasing the capacity of existing reservoir outlet works while maintaining project operations.

CAI provides clients with practical experience in evaluating existing spillways and outlet works, planning outlet upgrades and implementing the upgrades while the project is in operation.

Spillway and Outlet Works Expertise:

• Spillway PMF hydrology and flood routing
• Evaluation of existing spillway and outlet works capacity
• Specialty technical expertise regarding cavitation of hydraulic gates and valves
• Experience with temporary diversion works and dewatering facilities
• Eco-system and salmon restoration projects
• Practical experience with bidding and construction management

Representative Project Experience

• New Bullards Bar Spillway Gates Seismic Retrofit Yuba County Water Agency, CA
• Narrows Flow Bypass Project, Yuba County Water Agency, CA
• Bear Valley Dam Spillway Gate Upgrade, Big Bear Lake Municipal Water District, CA
• Hell Hole Reservoir Seasonal Storage Project, Placer County Water Agency, CA
• Cherry Reservoir Enlargement Project, City and County of San Francisco, CA