Building 31 at Birmingham International Airport Stormwater Outfall, Birmingham, Alabama

Building 31 at Birmingham International Airport is a stormwater outfall located at 4427 East Lake Boulevard in Birmingham, Jefferson County, Alabama. This facility is part of the airport's stormwater management infrastructure, handling runoff from the airport grounds and associated impervious surfaces. As a stormwater outfall, it discharges collected stormwater into local waterways, operating under the regulatory oversight of the United States Environmental Protection Agency's National Pollutant Discharge Elimination System (NPDES) Municipal Separate Storm Sewer System (MS4) program. The facility is situated in an urbanized area with significant impervious surfaces typical of an international airport, including runways, taxiways, parking lots, and buildings. Stormwater outfalls like this one are designed to convey runoff to receiving waters, often with treatment features such as detention basins or oil-water separators to manage pollutants. In Alabama, stormwater discharges are regulated under the Alabama Department of Environmental Management's NPDES permit program, which requires compliance with water quality standards and implementation of best management practices. This outfall plays a role in managing stormwater quality and quantity from the airport, helping to reduce flooding risks and protect downstream water bodies from pollutant loads. The airport's location in the Birmingham metropolitan area means its stormwater discharges may affect local creeks and rivers, including the Black Warrior River watershed. Effective stormwater management at this facility supports the airport's operational resilience and environmental compliance.

Birmingham, Alabama, experiences a humid subtropical climate with frequent thunderstorms and heavy rainfall, making stormwater management critical. The airport's large impervious surfaces generate significant runoff containing pollutants such as oil, grease, heavy metals, and sediment. Discharges from this outfall may enter local waterways that ultimately drain to the Black Warrior River, which is subject to water quality impairments from urban runoff. Regulatory oversight under the EPA NPDES MS4 program requires the airport to implement stormwater pollution prevention plans and monitor outfall discharges to minimize environmental impact.