Dungeness River Surface Water Intake Screen
Department of Fish and Wildlife,
Washington
Consulting Role
- Civil Engineering
- Structural Engineering
- Mechanical Engineering
- Hydraulic Analysis
- Cost estimating
- Construction support
- Dewatering Planning
Project Members
- Jason Hill, P.E.
- Eric Orton, P.E.
- Andy Blake
Project Phase
- Completed 2018
Key Elements
- Surface water intake
- NOAA Compliant
- Design with fish on station
- Environmental permitting support
- Active screen cleaning system
- Sediment management systems
- Worker Safety
- Retractable T-Screens
- Fish by-pass
WDFW contracted services to design a new 80 cfs intake to supply water from the Dungeness River in support of rearing operations at Dungeness Hatchery and Agnew Irrigation District.
The screen was designed to meet all National Marine Fisheries Service (NMFS) and WDFW guidelines. Design elements included four retractable T- screens (20 cfs each) placed in a line within a sheltered sump. To reduce the threat of frazil ice, the screen sump is enclosed by a pre-engineered metal building complete with radiant heaters to manage frazil ice buildup. An additional water jet system accompanies the screen bay to support the agitation of fine sediments to reduce build up. An addition of a handheld water jet lance also aids operators to move sediment build up in corners.
The facility is designed with a capacity to withdrawal up to 80 cfs at peak flow. Normal operations allow for one screen to be on standby during winter months, allowing additional redundancy should a screen become clogged with frazil ice or have an operational issue.
Each screen has a brush cleaning system that operates at a timed interval or can be activated should a difference between the forebay and aft bay exceed a 0.1 ft differential. The overall system is designed to meet NOAA screening criteria.