Jefferson County, AL Environmental Rules: Erosion Control (2026)

S. Highway 280 Corridor Overlay adopted under the county's site-plan review process, sets six grading and drainage standards that apply before the Department of Development Services will issue a building permit for property in the corridor. Subsection (a) requires a smooth topographic transition throughout the site and between adjoining properties and bans any slope steeper than a 1:3 rise-to-run ratio, except where a retaining wall is used instead. Subsection (d) requires subsurface drainage structures and grass swales to manage stormwater in any area visible from public property, and flatly prohibits open ditches in those areas.

Subsection (e) bars the use of crushed granite or limestone for slope stabilization or storm drainage within the public right-of-way and in any area visible from Highway 280's driving or turn lanes. Subsection (f) is a certificate-of-occupancy hold: every slope on the site must be stabilized with grass, evergreen groundcover, or other vegetation before the county will issue a certificate of occupancy for the building. A related retaining-wall standard, subsection (c), requires walls over eight feet in height that are visible from public property to be screened with vegetation.

Compliance is documented through the grading plan required under Sec. 03(i)(1), which must show all areas of cut and fill and finished floor elevations relative to the Highway 280 pavement, and through the erosion and sedimentation control plan required to meet or exceed Alabama Department of Environmental Management best-management practices. S. 280 Corridor in unincorporated Jefferson County; they do not extend countywide or into Birmingham, Hoover, or the county's other municipalities, each of which enforces its own grading rules.