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Board directs study of South County growth impacts after staff report on flooding and infrastructure burdens
Summary
Staff told the board South County contributed 400 of 447 lane miles added in the last decade and that about 41% of South County development predates county stormwater rules; Commissioners directed staff to evaluate options to address flooding, maintenance burdens and funding, and to return recommendations.
Hillsborough County staff on Oct. 1 presented a report on growth in South County, tying recent flooding to both legacy infrastructure and construction‑related impacts and urging the board to examine long‑term funding and service strategies.
Josh Belotti, engineering and operations, said county stormwater requirements generally require post‑development peak discharge not to exceed predevelopment discharge for the 25‑year, 24‑hour rainfall event and that the county applies higher standards — compensatory floodplain storage and 72‑hour stormwater pond recovery — in many cases. He said roughly 41% of South County development predates the county’s 1982 stormwater regulations.
As a case study, Belotti described back‑to‑back high‑intensity rainfall events in 2024 that caused flooding along West Lake Drive; staff attributed part of the problem to silt obstructing culverts from construction activity and said the impacts were temporary after silt removal and regrading.
Belotti also presented a ten‑year measure of contributed assets: the county accepted 447 lane miles of roadway from new development, 400 of which (about 90%) were in South County. He said maintenance staffing and budgets have remained largely flat while workload in the South service area has increased (about 19% more work orders since 2019 relative to other service areas).
Commissioner Christine Miller moved to direct the county administrator and public works to evaluate options addressing the unique growth challenges in South County, including the South County service unit workload, and to return recommendations, cost estimates and proposed next steps. Commissioners discussed the role of impact fees and stormwater rate studies; the motion passed 7‑0.
Next steps: staff will prepare recommendations and a stormwater rate‑study presentation ahead of next year’s stormwater assessment process and return costed options for board consideration.
