San Angelo, TX Environmental Rules: Stormwater Management (2026)

05 was adopted to protect life, health and property from flooding on the Concho River watershed and to keep public drainage costs down. Sec. 001(e) triggers the article whenever a project inside the city limits or ETJ disturbs one acre or more and raises impervious cover by 5 percent or more over existing conditions; land in active agricultural use is exempt until it converts to another use. The city engineer, acting as administrator, enforces the city stormwater design manual referenced in subsection (f), which sets the technical rules for channel, street, storm-drain and detention design, including the two-year and 100-year design storms used throughout Sec.

006's drainage tables. S. Army Corps of Engineers Section 404 permits, Texas Commission on Environmental Quality Section 401 water-quality certifications, FEMA floodplain revision permits, and EPA National Pollutant Discharge Elimination System permits, in addition to any city permit. The areas of special flood hazard governing the article are those mapped in FEMA's Flood Insurance Study for Tom Green County dated March 2, 1994, as later revised. Requests for variances or deviations go to the city under subsection (m), and public drainage improvements accepted by the city are maintained by the city under a recorded maintenance agreement when not city-dedicated. Subsection (h) makes the more restrictive rule control whenever this article conflicts with another ordinance, easement, covenant or deed restriction.