Hoover, AL Environmental Rules: Grading & Drainage (2026)

Birmingham Land Development Ordinance Chapter 6 and Jefferson County Land Development Regulations require grading permits for excavation, fill, or site alteration exceeding threshold quantities, typically 50 cubic yards cut or fill. Site grading must direct drainage away from structures and not adversely affect adjacent properties - Alabama common law 'natural flow' doctrine prohibits altering natural drainage patterns to burden neighboring land, reinforced by Ex parte Alabama Power Co. and similar precedents. Drainage swales, French drains, catch basins, and underground detention may be required in complex sites. Retaining walls over 4 feet (measured from bottom of footing to top of wall) require engineered design by Alabama-licensed PE and separate building permit. Karst geology across much of Jefferson County - particularly Trussville, Irondale, Leeds, and portions of Hoover - requires geotechnical review to prevent sinkhole formation from concentrated stormwater or altered groundwater flow. Sinkholes have destroyed structures throughout the metro, most famously the Wichita Avenue sinkhole in Trussville (1997) and multiple incidents in Moody (nearby St. Clair County). Compaction testing required for structural fill supporting buildings, typically 95% modified Proctor per ASTM D1557. Final grade must match approved plans within specified tolerances. Property owners responsible for ongoing maintenance of private drainage facilities. Red clay soils expand and contract with moisture, creating additional foundation considerations.