Howell Creek and Carriage Hill Erosion Control

The City of Casselberry experienced significant erosive damage within the Gee Creek and Howell Creek drainage basins as a result of Hurricane Ian. Enviro-Tech Systems, Inc. (ETS) completed this project to restore stormwater management infrastructure and remove debris at both locations.

The first location involved removing and replacing failing gabion baskets along Howell Creek behind the Carmel by the Lake Condominiums. The plans called for temporary and permanent sheet piling to be installed along with floating turbidity barriers that would allow sections of the Creek to be dewatered. However, during construction, subsurface conditions that prevented the sheet pile from being successfully driven in certain areas were discovered. Therefore, the scope was adjusted to include only the gabion baskets above the waterline. ETS removed the failing gabion baskets, recovered useful material, constructed and filled new gabion baskets, and sodded disturbed areas of the creek bank.

The second location, referred to as the Carriage Hill Outfall, is adjacent to the Casselberry Greenway Trail. ETS utilized the active pedestrian trail to mobilize equipment and materials to the project site while maintaining the safety of the general public. ETS replaced a 30” mitered end section and concrete pad with a Type “D” Inlet, 30” FDOT U-Type Endwall with energy dissipater and grates, and geoweb with filter fabric and riprap. As the structure was cast in place and ETS was tying into an existing storm drain structure, stormwater from the surrounding community had to be collected and redirected around the structure so work could be completed in dry conditions. Further, ETS graded the structure’s discharge area to stabilize the ditch banks that had been eroded from large storm events.