As a part of the AECOM team, GreenPoint Engineering is leading the Interior Drainage engineering tasks for the Coastal Protection and Restoration Authority of Louisiana's $1.3-billion Mid Barataria Sediment Diversion Project. The The Mid-Barataria Sediment Diversion will harness the power of the Mississippi River for long-term, sustainable sediment, water, and nutrient delivery to the surrounding wetlands, transporting the sediment from the river to the Barataria Basin.
A key feature of GreenPoint's effort will be to model the various configurations under consideration, and to evaluate the feasibility of an inverted siphon to maintain drainage once the diversion channel is constructed.
GreenPoint Engineering designed improvements to the Lake Cataouatche No. Drainage Pumping Station, and performed a hydraulic analysis of historic storm-influenced tidal conditions to optimize the design.
A large portion of the storm water system on the west bank of Jefferson Parish is pumped into Lake Cataouatche by the Parish’s Lake Cataouatche No. 1 pumping station, one of the largest and most critical features of the Parish’s flood protection system. This major pumping station conveyed approximately 3.7-billion gallons of storm water to Lake Cataouatche over the last year. Still, the station falls short of its intended capacity while consuming excessive energy. GreenPoint Engineering identified and pursued financing through a state and federal program intended to promote energy efficiency, and is providing design services to alleviate these deficiencies.
In performing the analysis, GreenPoint evaluated all factors contributing towards hydraulic efficiency, including the range of discharge elevations in Lake Cataouatche, the tidally influenced body receiving the station’s flows. GreenPoint gathered stage data from the nearby National Oceanic and Atmospheric Administration’s tide station at Bayou Gauche to evaluate annual trends and historic high conditions during storm events. The analysis revealed the maximum condition the station should address, as well as the typical conditions encountered the majority of the time. This analysis allowed the design to cost-effectively capture the full range required to meet the intended level of service.
The design that followed included modifying the hydraulic profile of the station’s 60-in and 72-in discharge piping, replacing its two 250-cfs pumps and gearbox, and replacing its diesel engines with modern, higher efficiency turbocharged diesel engines.
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