FLOOD PROTECTION FOR THE HENDERSON BAYOU WATERSHED

摘要

The Henderson Bayou Watershed in Ascension Parish, Louisiana, includes the town ofGalvez, Louisiana, and has an area of approximately 14 square miles. The main channelof Henderson Bayou begins near the intersection of Misty Oak Court and N. BurnsideAvenue. It flows southeast until it crosses Henderson Bayou Road. From there, thechannel flows northeast until it eventually discharges into the Amite River.Flood management facilities were recommended in a preceding watershed study toprotect against backwater flooding from the Amite River. That study showed majorflooding within the Henderson Bayou Watershed resulting from backwater from theAmite River.Based on the previously completed watershed hydrology report, and due to the variousflooding sources, the focus was designing a flood protection structure for a 10-year AmiteRiver backwater event. The proposed project includes flood gates to maintain the existinglevel of service within the watershed when the Amite River is under normal conditions.Because backwater events could potentially occur in conjunction with large storm events,the design includes a pump station to reduce the potential for flooding of structureswithin the watershed when all gates are closed.This paper presents the final design and construction of the flood management facilitiesconsisting of a proposed stormwater pump station, flood protection levee, and flood gatestructure upstream of the Amite River confluence. The flood gate system consists of fourbulkhead gates including one for the navigation channel to maintain navigation in thebayou. Also, the project includes a levee system that ties into the west side of the pumpstation/flood gate structure and extends in a westward direction in order to complete thebackwater prevention protection system The system is currently under construction(Figure 1).