Engineers say proposed Deering Park development would reduce downstream flows in modeling

A resident and developer representative asked whether the master‑plan model considered lands west of I‑95. Consultants said the proposed Deering Park development was modeled with its proposed stormwater controls and that the development would, in modeled scenarios, reduce peak flows at two discharge locations into Little Cow Creek and Turnbull Hammock.

"Deering Park is about a 2,000 acre development. 400 acres are being set aside for stormwater ponds and stormwater management," Jared Hernice said, explaining that the proposed ponds (about 21% of the developed area) cause significant flow attenuation in modeled 10‑, 25‑ and 100‑year events. The team said modeled stage differences at downstream nodes were negative (indicating reduced stages) when comparing proposed to existing conditions in several design storms, and that some modeled reductions approached 50% for certain nodes.

Why this matters: the modeling result addresses resident concerns that new development would increase flooding downstream; consultants emphasized that proposed on‑site storage and attenuation accounted for the modeled reductions but recommended continued review of specific site designs in development permitting.