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APWA Technical Session 19 Sampson River and Alligator Creek Flood Abatement Project, Bradford County, FL

November 4 @ 12:00 pm - 1:00 pm

Sampson River and Alligator Creek Flood Abatement Project, Bradford County, FL, June 2018 through May 2019

Speakers: John Gilreath, Chad Rischar

The consequences of Hurricane Irma and other major storm events in rural Bradford County and within the City of Starke were devastating. Numerous homes and businesses flooded, and tree debris dams restricted the flow of Sampson River and Alligator Creek. Tree debris obstructed the historic drainage capacity and surface water hydraulics and were concluded to be a contributing cause of real property loss to residences and commercial structures.

As a result, the Bradford County Emergency Management Office was charged with tree debris removal along approximately 17 miles of river, creek, and tributaries within the watershed. Bradford County hired DRMP to provide project management, project delivery, ArcGIS spatial analysis and mapping, permitting, stakeholder meetings and construction inspection services throughout the 220-day project duration. DRMP developed and executed additional hydraulic improvements within the watershed, which included tree debris removal in five additional tributaries and the removal of sediment at the CR225 culverted crossing of Sampson River. Several feet of sediment accumulate upstream of the culverted crossing, which restricted flow and resulted in diminished volume. The adjacent shoreline was stabilized to prevent eroded banks and future sediment accumulation. Through careful planning and execution, no permanent project wetlands were impacted, such that wetland mitigation was not required.

Over 500 tons of tree debris were removed from the watershed within the compressed project delivery timeline. Concurrence of project completion and permit compliance by Suwannee River Water Management District (SRWMD) permitting staff was achieved and the surrounding communities are substantially less likely to sustain flooding after major storm events.



November 4
12:00 pm - 1:00 pm
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