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Commission narrows definition of impervious surface; pervious stone/gravel may qualify if unmanaged compaction avoided
Summary
Planning staff and commissioners agreed on guidance that non‑compacted stone, gravel or engineered geocell driveways can be treated as pervious for planning calculations unless compacted, while engineered systems may qualify as low‑impact design (LID) if accompanied by full engineering documentation.
Winchester planning staff and commissioners discussed how to interpret the town’s impervious‑surface rules, particularly around stone, gravel and other non‑compacted materials frequently used near Highland Lake.
Staff outlined a proposed reading: stone driveways, walkways and drip‑line treatments that are not compacted should generally be considered pervious; by contrast, parking lots, sidewalks and compacted gravel should be considered impervious. Commissioners agreed that an engineered solution — for example, stone over geogrid cells with documentation demonstrating maintained porosity — could be counted as pervious and could qualify as an LID element if fully engineered and maintained.
Commissioners emphasized the need for written guidance so residents, surveyors and engineers apply a consistent standard; staff said they would prepare a one‑page interpretation and that engineered LID measures should be required to show maintenance plans and calculations. Several commissioners said past staff turnover contributed to inconsistent interpretations and asked that the guidance be circulated to stakeholders.
