Miami-Dade County has experienced remarkable growth over the past thirty years, with a population that has grown to 2.3 million. Consequently, difficulties exist in maintaining a stormwater management system that meets the increased needs of the community. Unusually large precipitation events in 1999 and 2000 caused flooding in some Miami neighborhoods that were built in low-lying areas before established stormwater management regulations.
As a result of the failure of existing stormwater infrastructure, the county commission created a Flood Management Task Force which received support from the Florida Department of Community Affairs, the South Florida Water Management District, the U.S. Army Corps of Engineers, the Federal Emergency Management Agency and several local municipalities. The centerpiece of the planning phase for updating the existing system was the C-4 Canal Flood Mitigation Project Basin Study, a hydrologic and hydraulic model of the C-4 Canal Basin. This modeling effort, completed by PBS&J using xpswmm version 8, allowed for the evaluation of the mitigation benefits provided by different system enhancements and operational scenarios and led to implementation of several improvements well ahead of schedule.
Flood protection in Miami Dade county