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Working group coalesces on 1.5-inch infiltration minimum for many projects; cost and scope debated
Summary
Members discussed and supported a 1.5-inch minimum volumetric infiltration requirement for many projects, debated whether that figure should be set in the bylaw or regulations, compared nearby towns' thresholds, and discussed likely cost implications including additional chambers and construction mobilization.
The Needham Stormwater Bylaw Working Group discussed and largely defended a proposal to require infiltration systems sized to capture a minimum of 1.5 inches of rainfall (a volumetric requirement) for properties that exceed defined impervious thresholds.
Why it matters: the 1.5-inch standard is intended to improve local stormwater recharge and phosphorus capture, and it is a key technical change that will affect designers, builders and property owners. The group noted that phrasing the requirement as a volumetric capacity (a static captured volume) is important to avoid design workarounds based on short-duration infiltration rates.
Key points from the discussion: - Thresholds: the working draft distinguishes small and large projects. Properties with more…
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