Richmond planning commission directs staff to draft unified stormwater and erosion-control section

The Richmond Planning Commission on March 4 agreed to direct staff to prepare a single zoning section labeled “storm water and sediment control and erosion prevention” that would combine temporary erosion-and-sediment controls for construction with permanent post-construction stormwater standards.

Commission Chair Virginia said the commission wanted a clear, usable rule set for applicants and staff; members broadly endorsed a three-trigger framework that staff and commissioners will use to set thresholds and administrative requirements.

Keith, a town planning staff member who prepared the writeup the commission reviewed, opened the discussion with a technical distinction: “An erosion and sediment control plan is not the same thing as a storm water plan,” he said, explaining erosion controls are typically temporary measures during construction while a stormwater plan is a permanent, engineered system requiring maintenance.

Why it matters: commissioners said the town needs both sets of rules to protect water quality and to limit runoff damage as new projects add impervious surface. The group agreed to keep the new section concise but to reference two implementation handbooks—the Low-Risk Development Handbook for small construction-phase controls and the Low-Impact Development Handbook for post-construction green infrastructure—so applicants can access practical installation guidance.

Key choices under discussion: the commission confirmed three primary regulatory triggers that staff will draft into the new section: (1) amount of land disturbance (examples discussed included 10,000 square feet/one-quarter acre thresholds as a starting point), (2) slope (with staff proposing a higher standard for steeper sites), and (3) the total amount of impervious surface after construction. Members debated whether thresholds should be fixed-area triggers, percent-of-lot coverage, or a hybrid tailored by district (village versus rural).

On slope, members discussed numeric triggers and professional-design thresholds. Keith said engineers commonly incorporate slope coefficients into design; commissioners considered requiring a professionally designed plan on steeper slopes and discussed a range (members noted other towns use 15% as a lower threshold, the town’s existing rule is 20%, and staff earlier mentioned 35% as a no-build upper bound).

On scope and enforcement, members urged the commission not to simply defer to state thresholds (for example, the one-acre or three-acre state permitting lines). Chelsea, a planning commissioner, said she was “opposed to us stopping at an acre just because we kind of presume the state’s going to take over there,” arguing Richmond can and should set local expectations and add town-level review where needed. Commissioners asked staff to explore requiring town-engineer review for projects that also require state-designed plans.

Administrative work: commissioners asked staff to prepare a draft section for a future meeting, including the proposed numeric triggers, a checklist for applicants, and suggested references to the recommended handbooks. They also asked to invite the highway department to explain the town’s existing stormwater infrastructure (drop inlets, swales, pipes) so the draft can account for what’s feasible on the ground.

What’s next: staff will draft a consolidated section for the commission to review line by line at a future meeting. No formal vote was taken on substantive regulatory changes; the session produced direction to staff and consensus on the approach.

The commission adjourned the meeting after completing a separate review of technical edits to section five of the zoning regulations.