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Consultants say upsizing Oak Street trunk line would reduce flooding in Melbourne Beach's Basin 10
Summary
A Haley Ward presentation to the Melbourne Beach commission found that Basin 10's storm sewer generally prevents finished-floor flooding except in rare 100-year storms, but road and driveway flooding commonly occur in 5-year events; the firm recommended upsizing a constrained trunk line on Oak Street, adding inlets upstream and targeted CCTV inspections with an estimated preliminary TV cost of about $9,000.
David Baggett, vice president and engineering manager at Haley Ward, told the Melbourne Beach commission at a workshop meeting that a hydraulic and field survey of Basin 10 shows the neighborhood's storm system generally prevents finished-floor flooding except under an extreme 100-year event but does allow road and driveway ponding during more frequent storms.
Baggett said the firm modeled 10 storm scenarios with StormWise and used updated drone photogrammetry and targeted field surveys to map inlets, pipe inverts and rim elevations. "We don't see anything hit finished floors until you get to the hundred-year storm," Baggett said, noting the model equates that event to about 13 inches of rain in 24 hours. He added that the system typically shows road ponding in 5-year, 24-hour storms (about 6 inches) and that most ponding clears within one to five hours.
Why it matters: residents reported repeated incidents in which floodwater reached front doors and garages, sometimes yearly. The report and residents' testimony give the town a technical baseline to set priorities, scope design work and…
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