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Staff data show newer development increases hard surfaces; worst‑case extrapolation equals about 851 acres
Summary
County staff showed parcel‑level stormwater utility data indicating more recent builds have higher impervious area and said a 90th‑percentile extrapolation could add roughly 851 acres of hardscape over time without policy change.
Staff presented parcel‑level impervious‑area data derived from the county’s 2024 stormwater utility GIS layer and compared build‑date cohorts to show that more recent development generally has larger impervious footprints. The benchmarking and peer‑jurisdiction review informed the proposed percentage bands for each zoning district.
"We're talking about, an additional 851 acres of of coverage," Nick Rogers said when describing a conservative "reasonable worst case" extrapolation from the dataset. Staff framed the number as a hypothetical to show scale — not as an inevitable outcome — and warned that stricter limits would reduce that potential but create more nonconforming properties under current conditions.
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