typical impervious-surface coverage for industrial/data-center sites, driving 100-yr detention volumes
70-90%observed
| Value kind | observed — Reported measurements, counts, and specifications keep the precision and scope stated by their source; an exact specification is not treated as a range. |
|---|---|
| As of | 2025 |
| Source | EPA NPDES / civil-engineering practice · Table 3-2, Modeled Land Use Categories; industrial land is assigned 70% and commercial land 90% imperviousness |
| Review | checking…review by 2026-09-29 · standard cadence |
| Recorded changes | last 2026-06-29 |
| Claim id | typical-impervious-surface-coverage-for |
Where the guide uses it
Not quoted in a chapter yet; it is kept in the curated register.
← Full numbers register — every date-stamped figure in the guide, with revision history.