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I-95 Widening/Spruce Creek Hydrodynamic Model

RS&H is providing design services to widen I-95 from SR 44 to I-4 by adding fifth and sixth lanes within the existing median. Additionally, twin bridges over Spruce Creek will be replaced and new stormwater treatment areas will be introduced to the existing median. The Spruce Creek watershed area totals 29.4 square miles.

Utilizing Surfacewater Modeling System (SMS) and RMA2, the team created a two-dimensional hydrodynamic model of Spruce Creek to demonstrate that the water surface elevation in the creek will not rise due to the proposed bridge structures, as well as to analyze the scour conditions at the proposed bridge locations. RS&H completed a Bridge Hydraulics Report and a No-Rise Certification Report for FEMA since Spruce Creek is in a regulatory floodway.

The team also analyzed Spruce Creek from its intersection with Pioneer Trail to the Atlantic Ocean, approximately 20 river miles, as well as used a combination of HEC-RAS and SMS to model the entire project area. The team collected data from FEMA’s Flood Insurance Study for Volusia County, collected Light Detection and Ranging (LiDAR) data, conducted topographic survey and cross sections of Spruce Creek, reviewed existing construction documents, and conducted site visits. The team then used the completed model to determine scour conditions at the proposed bridge locations in order to anticipate the necessary abutment scour protection.

Project Information

Location:
Volusia County, Florida

Client:
Florida Department of Transportation, District Five