NRAC debates stormwater standards and LID; approves Miller Lake basin case study to guide ordinance changes

Members of Volusia County's Environmental and Natural Resources Advisory Committee spent the second half of their Feb. 5 meeting reviewing recent council direction and debating how the committee should advance stormwater policy recommendations to County Council.

Committee members and staff framed two parallel paths: amend county's unincorporated-area implementing rules (chapter 72) and, where appropriate, align or raise the countywide minimum stormwater standards in chapter 50 that apply to municipalities. Staff said chapter 50 contains concise baseline language intended as a countywide minimum; chapter 72 contains more detailed design and maintenance requirements for unincorporated areas.

Discussion ranged from technical design questions (which storm-duration and return-period to use for design; when to use open- versus closed-basin analyses) to policy and enforcement issues (who owns and maintains ponds and easements; how to require maintenance; legal defensibility of changing design rainfall). Members repeatedly cautioned that changing locally used design rainfall without an accepted state or federal data source could create legal exposure for the county and developers.

The committee also debated the county's low-impact development (LID) package. Some members and public commenters characterized LID as an omnibus approach that mixes useful measures with provisions that will not materially reduce flooding; others said LID provides multiple environmental co-benefits beyond flood control. Staff reiterated that an earlier committee recommendation for a hybrid LID approach remains an option but that converting the current voluntary draft to a mandatory hybrid model would require a substantially different drafting process and additional review.

To ground further ordinance work in a concrete case, the committee voted to pursue a basin-level case study. Member Tyler moved that the committee study the Miller Lake basin (a multi-jurisdictional basin with an extensive permitting and mitigation history) to analyze what failed or worked, what role recent projects and fill played, and which code changes could reduce recurring flooding. The motion was seconded by Jessica and carried by voice vote; minutes record the motion as approved but do not show a numeric tally.

Committee members said the case-study approach would let them identify specific, technic al, and legally defensible code edits rather than debating broad principles in the abstract. Staff agreed to post the county/city jurisdiction comparison matrices and the consultant's matrix used in the meeting packet and to circulate the chapter 50 text and the items already proposed for chapter 72 so members can compare language before the next meeting.

The committee also discussed outreach steps: staff will offer the draft chapter-50 changes to municipal managers and the mayoral roundtable for early comment, and will coordinate with water-management districts and county engineering staff as basin studies and H&H design documents are completed.

Ending: The committee approved the Miller Lake case study as its next focused task and directed staff to post the comparative matrices and the chapter 50 text for member review; members and staff emphasized the case-study work should inform — but not prematurely replace — existing state and federal rainfall and flood mapping standards.