Stormwater Improvement for St
نویسندگان
چکیده
St. Armands Key, a barrier island located in western Sarasota County in Florida, has had a history of chronic flooding. It is relatively low and bowl-shaped and has experienced flooding caused by both excessively high tides and rainfall events. The existing stormwater drainage system on the Key includes one pump station and gravity drainage pipes, which are not adequate to meet the level of service requirements (No street flooding for 3-year, 1-hour rainfall event and no structural flooding for 25-year, 24-hour event at a design tide elevation of 2.5 feet). A hydraulic model of the existing drainage system was developed using Advanced Interconnected Channel and Pipe Routing (AdICPR) model. Hydrologic and hydraulic simulation using 3-year, 1-hour design rainfall and 2.5 feet design tide indicated severe street flooding of depths up to 16 inches from the gutter line. This flooding is most prevalent in the northern half of the Key. Simulation using 25-year, 24-hour rainfall and 2.5 feet design tide indicated twelve structures whose finished floor elevations fall below the predicted flood stages. Different alternatives were evaluated to complement the existing drainage system that would enable it meet the level of service requirements. Restoration of an existing stormwater pump station, installation of four
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Analysis of Urban Stormwater Best Management Practice Options for the St. Joseph River Watershed
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