Johns Island Flood Risk Assessment:

Davis & Floyd developed a 2D surface flow model (‘rain-on-grid’) to assess the potential flood risk for the island and U=used geospatial tools to identify significant watersheds on the island. The team also developed flood risk zones for the 2-, 10-, 25-, 50-, 100-year, and 24-hour design rainfall events. They worked with the City to identify existing flooding concerns, proposed development, and areas of future growth to prioritize the basins for more detailed 1D/2D watershed assessment models. In addition, the team developed GIS mapping and web applications to facilitate client communication and public outreach and planning reviews for proposed development.

Barberry Woods Drainage Study:

Davis & Floyd developed a dynamic hydrologic and hydraulic study using ArcMAP GIS tools and PCSWMM modeling software and used historical rainfall records and documented past flooding events to perform sensitivity analyses on the model. The team coordinated with property owners and city stakeholders to compare the results of the model with observed flooding conditions. Lastly, they modeled and identified solutions aimed to alleviate the flooding impacts while improving water quality.