Emory Court / Dupont Drive Area Drainage Improvements

The City of Tallahassee contracted with SAI to address persistent flooding and erosion issues in the area of Emory Court and Dupont Drive, including the secondary drainage pipe system and the primary drainage canal. Flooding was so severe that emergency response teams had to evacuate residents via boats.

SAI conducted a hydrologic & hydraulic stormwater modeling effort to analyze the secondary stormwater system in the 256-acre area and develop a design solution to address the frequent flooding. Improvements to the primary drainage system included design of a 30 to 36-foot wide canal with walls averaging 12-feet high in areas with limited right-of-way and other restrictions such as adjacent roadways. SAI designed gabion wall structures, steel sheet pile walls, and vehicle access ramps to drive from the berm down into the ditch for maintenance purposes. The secondary drainage system design included improvements to the pipe system and inlet structures. The final design included the following:

  • Over 7,000 cubic yards of gabion baskets and mattress
  • 79,000 square feet of steel sheet pile wall with concrete wall cap
  • 33,500 cubic yards of earthwork
  • Over 2,800 feet of concrete pipe, including 800-feet of box culvert
  • 41 drainage structures
  • Pavement restoration design for 1,500 feet of roadway
  • Over 2,100 feet of underground utility replacement/relocation, including a 42" sewer

  • Other project elements included erosion protection of an existing bike trail bridge and sanitary sewer aerial crossing details. SAI developed construction plans and technical specifications, successfully permitted this project through the FDEP, USACE, and the City, and provided limited construction administration support throughout construction of the project.

    SAI's design significantly reduced flood stages to provide a minimum 25-year level of service for roadway flooding and eliminate structure flooding. This project was selected as a 2012 Top Stormwater and Erosion Control Project by the Storm Water Solutions Magazine.