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Resiliency study finds higher future rainfall will increase canal stages; town study to model 2040–2070 scenarios
Summary
Consultants presented the Resilient Florida vulnerability assessment for Loxahatchee Groves, showing modeled increases in 100‑year, three‑day rainfall from roughly 17 inches today toward about 20–23 inches under mid- and late‑century scenarios and potential impacts on the C‑51 Palm Beach Canal and local drainage.
Consultants working on the state‑funded Resilient Florida project presented a vulnerability and exposure analysis of the town’s stormwater system, focusing on the canal network, culverts and how future rainfall and sea‑level rise will affect drainage. Randy (consultant) said the team modeled a current 100‑year, 3‑day design storm at about 17 inches of rain and projected increases to roughly 20 inches (2040s scenario) and nearly 23 inches (2070 scenario) under NOAA projections. The study uses LiDAR data flown for Palm Beach County to update flood stage and storage estimates and incorporates South Florida Water Management District (SFWMD) updates to the C‑51 model, including SFWMD’s scenarios of 1‑foot and 3‑foot sea‑level rise.
Why it matters: The modeling shows higher stages in the C‑51 will reduce the town’s discharge capacity in some future scenarios; that affects road access, critical assets and the town’s existing drainage permits. The town is using the results to evaluate changes such as reshaping canals, increasing culvert sizes, reintroducing weirs at Okeechobee Boulevard, and modifying structure operation protocols to improve discharge patterns.
Key points from presentation: Consultants have identified critical assets (fire, school, roadways) and will produce scenario maps for current and future conditions. They noted some SFWMD updates reduce projected stages in the C‑51 by about a foot compared with older evaluations; that benefit is incorporated in the town model. The team also proposed assessing targeted culvert upsizing, reshaping canals to increase storage, and operational changes to control structure sequencing to reduce peak stages.
Ending: Council requested a full list of steering‑committee members and asked staff to provide Isaac/previous storm comparisons for public context; the consultant said the next steering committee meeting is scheduled for July and that he will supply maps and a comparison to recent local storm events for the town’s use.
