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Draft zoning would widen setbacks for high‑priority wetlands, add limited‑activity buffers

Manchester City Commissions · November 18, 2024
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Summary

Planning staff and the Conservation Commission proposed raising structural setbacks in highest‑priority wetlands to 50 feet (from 25) and adding a 10‑foot limited‑activity buffer (no tree clearing or regrading); members discussed grandfathering for pre‑existing lots and enforcement options including restoration orders.

Staff and the Conservation Commission outlined proposed wetland protections in Section 6: a 50‑foot structural setback for parcels mapped as highest‑priority wetlands, and a separate 10‑foot limited‑activity buffer adjacent to delineated wetlands where tree removal and regrading would be prohibited. The presenter said the 25‑foot citywide structural setback would remain unchanged for other wetlands and that the 50‑foot measure targets only the polygons identified as highest priority in a 2016 study.

Why it matters: commissioners and conservation members argued the increased setbacks protect water quality and wildlife corridors; the Nature Conservancy was noted as monitoring development near Cedar Swamp. Members discussed grandfathering rules for pre‑existing lots and whether an exemption cut‑off year (previous ordinances used a 'pre‑1999' rule) should be applied to avoid penalizing already developed lots.

Enforcement and remedies: staff said that violators could face enforcement actions and restoration requirements; commissioners asked staff to confirm enforcement authority and capacity for compliance monitoring. The Conservation Commission prioritized this as a top item in the rewrite.

Ending: staff will codify 50‑foot structural setbacks around highest‑priority wetlands and a 10‑foot limited‑activity buffer, and will work with Conservation to draft grandfathering language and enforcement procedures for restoration where necessary.