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Barberry Woods Drainage Study
The City of the Charleston contracted Davis & Floyd to develop a hydrologic and hydraulic model to investigate the causes of significant, frequent flooding of neighborhoods located in an approximately 500-acre drainage basin on Johns Island.
Developed a dynamic hydrologic and hydraulic study using ArcMAP GIS tools and XPStorm (with runs on the EPA SWMM computation engine)
Used historic rainfall records and documented past flooding events to perform sensitivity analyses on the model
Coordinated with property owners and City stakeholders to compare the results of the model with observed flooding conditions
Modeled various potential solutions aimed to alleviate the flooding impacts while improving water quality, including increased conveyance capacity, storage areas, flow diversions, and/or raising of infrastructure
The drainage basin is relatively long and flat, which makes adequate stormwater conveyance difficult
Development has restricted that natural flow of water, which results in flooding
Much of the area within the basin is undeveloped and subject to development pressure, which could worsen the severity of flooding
Davis & Floyd will present a potential improvement matrix to the City with cost-benefit analyses to help determine a preferred improvement alternative.