Stormwater

Barberry Woods Drainage Study

Client
City of Charleston
Date
Ongoing
Disciplines
Stormwater
Surveying
Objectives

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.

Scope

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

Challenges

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

Outcome

Davis & Floyd will present a potential improvement matrix to the City with cost-benefit analyses to help determine a preferred improvement alternative.

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