Location
UMass Amherst
Start Date
28-6-2011 4:05 PM
End Date
28-6-2011 4:25 PM
Description
EA Engineering, Science, and Technology (EA) and Connecticut Fund for the Environment (CFE), in consultation with the Connecticut Department of Environmental Protection, have designed and are permitting modifications of a culvert inlet transition on the Pequonnock River to incorporate a pool and weir fish way. During low-flow periods, water depths down the existing concrete transition, which is near the intersection of Chopsey Hill Road and Glenwood Avenue in Bridgeport, Connecticut, are too shallow to allow upstream fish passage for target species (American shad, blueback herring, and alewife). The pool and weir sections were designed to improve fish passage during the upstream migration season (1 April 31 July) over a 5-178 cfs with a maximum velocity of 5 ft/sec and minimum water depth of 8 in. EA designed a multi-tiered weir able to provide different depths at different flow regimes and designed the pools using the U.S. Fish and Wildlife Service’s (USFWS) Energy Dissipation Factor(EDF) formula. The weirs were designed to provide an 8-in. minimum depth through a low-flow notch at the minimum design flow (5 cfs) and the majority of the normal design flow (45 cfs) over the remaining weir. Depths in the low-flow notch were 14 in. at normal design flow (45 cfs) and 22 in. at maximum design flow (178 cfs). Velocities in the pools and weirs were less than 5 ft/s for all design flows. Water depths in the concrete transition adjacent to the pool and weir channel ranged from 1 in. at normal design flow up to 6 in. at maximum design flow. For the range of design flow, the EDF for the pools was less than 4.0 ft-lbs/sec per ft3 of pool volume, less than the USWFS standard of 4.0 ftlbs/ sec per ft3 maximum.
Session B6- The Bridgeport solution: Pool and weir fishway retrofit for a Pequonnock River culvert inlet transition
UMass Amherst
EA Engineering, Science, and Technology (EA) and Connecticut Fund for the Environment (CFE), in consultation with the Connecticut Department of Environmental Protection, have designed and are permitting modifications of a culvert inlet transition on the Pequonnock River to incorporate a pool and weir fish way. During low-flow periods, water depths down the existing concrete transition, which is near the intersection of Chopsey Hill Road and Glenwood Avenue in Bridgeport, Connecticut, are too shallow to allow upstream fish passage for target species (American shad, blueback herring, and alewife). The pool and weir sections were designed to improve fish passage during the upstream migration season (1 April 31 July) over a 5-178 cfs with a maximum velocity of 5 ft/sec and minimum water depth of 8 in. EA designed a multi-tiered weir able to provide different depths at different flow regimes and designed the pools using the U.S. Fish and Wildlife Service’s (USFWS) Energy Dissipation Factor(EDF) formula. The weirs were designed to provide an 8-in. minimum depth through a low-flow notch at the minimum design flow (5 cfs) and the majority of the normal design flow (45 cfs) over the remaining weir. Depths in the low-flow notch were 14 in. at normal design flow (45 cfs) and 22 in. at maximum design flow (178 cfs). Velocities in the pools and weirs were less than 5 ft/s for all design flows. Water depths in the concrete transition adjacent to the pool and weir channel ranged from 1 in. at normal design flow up to 6 in. at maximum design flow. For the range of design flow, the EDF for the pools was less than 4.0 ft-lbs/sec per ft3 of pool volume, less than the USWFS standard of 4.0 ftlbs/ sec per ft3 maximum.
Comments
Mr. Curtis Mason is a 2003 graduate of Purdue University with a B.S. in Civil Engineering Structural, and is a registered Professional Engineer in Massachusetts, Rhode Island, Connecticut, and Arizona. His responsibilities in EA’s Northeast Business Unit include project management and coordination, detailed civil engineering design, construction supervision, and preparation of construction bid documents. He has over 7 years of design and management experience in multidisciplinary projects as a civil engineering consultant throughout the nation and, specifically, the New England states. In the northeast, Mr. Mason’s -restoration project experience includes stream restoration, dam removal, bank stabilization, upstream and downstream fish migration, fish ladder design, freshwater wetlands restoration and mitigation, salt marsh restoration, and culvert design.