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Vermont DEC to replace stormwater model as MS4 permits and 3‑acre site inclusions draw local questions
Summary
At the Nov. 4 MS4 Subcommittee meeting, Vermont DEC said it has contracted Geosyntec to replace an outdated stormwater‑impaired‑waters model with $100,000 from the Clean Water Fund; municipalities raised concerns that the new model could change flow‑restoration targets and affect projects included under MS4 permits, especially the inclusion of 3‑acre sites.
Vermont Department of Environmental Conservation officials told the Chittenden County Regional Planning Commission MS4 Subcommittee on Nov. 4 that they have selected Geosyntec Consultants to replace an aging stormwater‑impaired‑waters model and that the project received $100,000 from the Clean Water Fund.
Emily Schelley, representing DEC, said the old model — developed in 2017 and tied to ArcGIS 9.1 — was a bottleneck because only DEC staff could run it. The new platform is intended to be more stable, user‑friendly and based on…
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