Fish Passage
Safe passage.
Upstream or downstream, we offer safe and secure passage at every turn. From complex technical structures at major hydroelectric dams to the removal of large dams reconnecting entire ecosystems, our solutions offer safe passage so fish can complete their journey, no matter the species.
scopes of work
We've got you covered.
- Upstream and downstream fish passage
- Volitional and non-volitional passage
- Biological studies to determine fish movement patterns, timing, enumeration, and composition
- Habitat studies, taxonomic analysis, ecological studies, entrainment studies, and various biological research studies of threatened, endangered, and sensitive fish species, as well as non-listed species and stocks
- Negotiations and coordination with agencies, tribes, and varying stakeholders with competing interests
- Intimate knowledge of NOAA’s NMFS, USFWS, FERC, USACE, and state guidelines/standards
- Nature-like fishway (e.g., roughened channel, ramps, and rock weirs)
- Technical fishways (e.g., pool and weir, weir and orifice, vertical slots, serpentine, and pool and chute); baffle fishways (e.g., Denil fishway, Fatou baffle fishway, Alaskan Steeppass, super-active type bottom baffle fishway, and chevron-type; and mechanical fishways (e.g., lifts, locks, hoppers, trap and haul, and Archimedean pumps)
- Handling and sorting facility system, PIT detector switch gates, visual and recognition windows, sorting tables, anesthetic tanks, recovery tanks, and water-to-water transfer systems
- Exclusion/guidance systems (e.g., screens, louvers, angled bar and trash racks, booms, hanging chains, nets, and spillway weirs)
- Behavioral guidance and exclusion systems (e.g., lights, sounds, electric fields, air bubble curtains, and hybrid barriers)
- Floating surface collectors
- Spillway gate modifications [hyperlink to dam design and build] and spillway survival rate evaluations
- Spawning channel designs
- Fishway attraction systems, gravity and pumped systems, and high-velocity jets to attract fish from the far field to the near field
- Auxiliary Water Supply (AWS) design (e.g., horizontal and vertical diffusers and chimney weirs)
- Instrumentation and controls (e.g., HMI and SCADA)
- Fire life safety (suppression systems, alarms and mass notifications, access control, hydrant systems, and fire breaks)
- Total Dissolved Gas (TDG) abatement
- Computational Fluid Dynamics (CFD) modeling (Flow-3D)
- Water control, delivery, and piping
- Hydrologic analysis (flow volumes, frequency analysis, flow duration, hydrologic modeling (HEC-HMS), and hydrologic statistics (HEC-SSP)
- Hydraulic analysis (open channel flow, hydraulic modeling (HEC-RAS 1D and 2D), outlet/spillway capacity, stage discharge-curves, and energy dissipation performance)
- All heavy civil works, roads, bridges, building construction, installation of equipment, and testing, commissioning, and operator training
- Fish species expertise includes Chinook Salmon, Coho Salmon, Kokanee Salmon, Sockeye Salmon, Steelhead, Chum Salmon, Pink Salmon, Mountain Whitefish, Rainbow Trout, Bull Trout, Westslope Cutthroat Trout, Lahontan Cutthroat Trout, Cui-ui, Arctic Grayling, Pacific Lamprey, Rio Grande Silvery Minnow
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