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Developer seeks to dig pond in Harpers Landing swale; town engineer says hydraulics show no increase in flood risk
Summary
A Harpers Landing landowner proposed excavating an amenity pond in a storm swale within the subdivision's floodplain; the town engineer and a hydrologist submitted modeling that the town said shows no increase to floodplain elevations and council signaled support for further engineering and HOA coordination.
A Harpers Landing landowner told the Fairview Town Council on May 6 that he plans to excavate a deep amenity pond inside the subdivision swale and that he has hired a hydrologist to analyze flood impacts. Town engineering staff reviewed the submitted analysis and said it showed no rise in the floodplain and that a properly designed excavation could reduce the risk of sediment accumulation.
Town engineering staff said the swale’s normal flow velocities are well above the threshold where solids settle; staff cited the civil‑engineering rule of thumb that velocities below about 2 feet per second allow sediment to settle, while measured velocities in the channel and proposed pond area were in the upper 3 to lower 4 feet per second in the submitted model. The engineering review included LIDAR‑based contour comparisons from multiple years; staff said they saw no…
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