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Brunswick County adds 100-year storm standard; Sunset Beach to monitor local code changes
Summary
Brunswick County voted Jan. 20 to add a 100-year peak-discharge standard for some subdivisions and commercial projects. Town staff told the Sunset Beach Planning Board the town has not been formally notified and will review template code language before deciding whether to amend the Unified Development Ordinance.
Brunswick County has revised its stormwater requirements to add the 100-year peak-discharge standard for certain residential subdivisions and commercial developments, Sunset Beach planning staff told the Planning Board on Feb. 19.
The change, adopted by the county commissioners Jan. 20, requires applicants to design for the 1-, 10-, 25- and now 100-year storm events. Staff cited the county table showing a 100-year, 24-hour rainfall of roughly 11.6 inches in the townarea, up from about 8.52 inches used for the 25-year standard — a roughly 36% increase in the rainfall threshold designers must consider.
Why it matters: the county-level change could require Sunset Beach to amend municipal code if the townis bound by its interlocal stormwater agreement. That interlocal, staff said, directs the town to adopt county stormwater amendments within 90 days of official notification; if the town declines or fails to adopt within the required period, the interlocal could be voided.
What staff said: Ron Satterfield, town staff, told the board he initially was told the town did not need to change local ordinances but that Brunswick County later indicated the town may need to adopt conforming language. "They have not officially notified the town and any other jurisdictions as far as I know of this change," he said, adding that the county intends to provide template language and that appeals of county-engineer decisions would go to the Brunswick County commissioners.
Potential local impacts discussed included larger retention/treatment facilities and how larger ponds might affect tree preservation. A board member asked whether stricter stormwater standards could make it harder to preserve legacy trees; staff said it was "too soon to tell" but noted the town's UDO already has tree-mitigation provisions and that applicants can request hardship waivers to the 100-year standard for constrained lots.
Next steps: staff will wait for official notification and the countytemplate language, compare that text with Sunset Beach's UDO, and recommend any required code amendments to the board or council. The briefing was information-only; no action was taken.
The Planning Board moved on to other agenda items after the information-sharing report.
