In 2016 and early 2017, during my City Council Comments, I inquired about the extensive flooding that occurs on Shore Boulevard, between Beach Boulevard and 58th Street. The flooding impacts traffic due to the volume of water, threatens area businesses and hampers pedestrians from crossing the road. It is worse during heavy rains, but also occurs during high tide with no rain. With the major improvements completed west side of the Historic Gulfport Casino, as well as the ongoing work to the east, it's time to address the flooding as a complement to the other upgrades in the area.
The City Manager and city staff requested the assistance of Cardno to evaluate the stormwater flooding and drainage situation on Shore Boulevard, asking them to develop recommendations on potential improvements. Upon completing their work, Cardno presented their findings at the October 3, 2017 Gulfport City Council meeting (see agenda below). Below are highlights from the Cardno report.
The discussion evaluates the two separate drainage basins located in the project area, which historical data shows includes seven outfall pipes. However, only five of the seven outfall pipes were found by Cardno.
The inlets, inlet openings, throats and pipes were characterized as "substandard or damaged with exposed rebar."
Sand, silt and debris was also excessive. This is due to the substandard pipes, as well as pipes are also too small. Cardno also states that sand enters due to "bubble-up outfall structures" existing in shallow water.
Recommendations for Potential Consideration by the City of Gulfport
Water Quality Improvement: Adding a water quality treatment structure to the outfall pipes. They will capture sediment, floating trash and debris.
Roadway Elevation: Dupont Street South at Shore Blvd to Beach Blvd.
Basin W Rehabilitation: Construct in-line water treatment structures and two inlets on Clinton Street; investigate integrity of existing system.
Basin W Option 1: Replace existing pipes and inlets (Shore Blvd), reconstruct both outfalls, elevate Dupont Street to Beach Blvd, construct two in-line treatment structures, and construct two inlets on Clinton Street. Preliminary Cost: $2.2 Million
Basin W Option 2: Replace existing pipes and inlets, reconstruct one outfall, elevate Dupont Street to Beach Blvd, construct one in-line treatment structures, and construct two inlets on Clinton Street. Preliminary Cost: $2.1 Million
Basin E Rehabilitation: Construct three in-line water treatment structures and two inlets north of Essex Ave on 54th St S. (current inlets are inadequate; new inlets will collect runoff). Integrity of existing collection system will be investigated.
Basin E Option 1: Replace pipes and inlets, reconstruct and extend two outfalls, construct two in-line treatment structures, and construct additional inlets north of Essex Ave. Preliminary Cost: $953,000
Basin E Option 2: Replace existing pipes, reconstruct and extend one outfall, construct one in-line treatment structure, and construct additional inlets north of Essex Ave. Preliminary Cost: $831,000
Right now this information is very preliminary and will be subject to additional discussions within City Staff and City Council. More importantly, funding must be pursued from outside funding sources. We have several avenues we typically go to for funding infrastructure projects such as this one. As this potentially moves forward, I will update this page as needed.