As part of an extension to Litsey Road, Peloton Land Solutions, a Westwood company designed a new culvert crossing of an existing channel and realigned 1,500 linear feet of the downstream portion of the channel to its outfall into Elizabeth Creek. Near the outfall location, a junction was designed to merge the channel flows with additional discharges from 2-5’x4’ and 2-10’x5’ storm drain boxes carrying flows from an adjacent industrial site and from Beach Street, respectively. Our design included two separate concrete baffle block chutes – one for the Litsey Road channel and the other for the industrial site discharge – and a channelized junction to combine the flows before entering Elizabeth Creek.

The energy dissipation structures were designed to create both a hydraulic drop and a hydraulic jump within the baffled chutes. The junction occurs within the Elizabeth Creek floodway, but near the flowline elevation of the creek to minimize the chance for erosion. This engineered solution releases flows at a safe velocity into Elizabeth Creek, preventing erosion and maintenance problems. Despite the complexity of the hydrology and hydraulic design, all segments of this project were approved on schedule and construction is complete with no change orders.