LIBERTY 66 #121 Stormwater Outfall, Huntsville, Alabama

LIBERTY 66 #121 is a stormwater outfall located at 2605 University Drive Northwest in Huntsville, Alabama, United States. This facility is part of the municipal separate storm sewer system (MS4) serving the Huntsville area, which falls under Phase II MS4 regulations due to its population size. As a stormwater outfall, it discharges collected stormwater runoff from urban and transportation surfaces into receiving waters. The facility operates under the regulatory framework of the US Clean Water Act, specifically the National Pollutant Discharge Elimination System (NPDES) MS4 permit program. Huntsville's MS4 permit requires implementation of stormwater management practices to reduce pollutant discharges to the maximum extent practicable. Typical controls include detention basins, vegetated swales, and street sweeping programs to manage runoff quality and quantity. This outfall plays a role in managing stormwater runoff from the surrounding urban area, which includes commercial and residential zones. Proper operation helps mitigate localized flooding and reduces the transport of pollutants such as sediment, nutrients, and heavy metals to downstream water bodies. The facility contributes to the overall stormwater infrastructure that protects water quality in the Tennessee River watershed.

The outfall discharges into the Tennessee River basin, which is a major water resource in the southeastern United States. Urban runoff from Huntsville can carry pollutants like sediment, oil, and nutrients from roads and lawns. The facility's operation under the NPDES MS4 permit requires best management practices to minimize these impacts and protect aquatic habitats in the region.