Overview
KNIK PIT is a stormwater outfall in Wasilla, Alaska, serving the Matanuska-Susitna Borough. It operates under the US EPA NPDES MS4 permit framework for stormwater discharge.
KNIK PIT is a stormwater outfall located at Mile 13.7 Knik Goose Bay Road in Wasilla, Alaska, within the Matanuska-Susitna Borough. As a stormwater outfall, it discharges collected stormwater runoff from the surrounding urban and transportation infrastructure into the local watershed. The facility is operational and falls under the regulatory oversight of the US Clean Water Act, specifically the National Pollutant Discharge Elimination System (NPDES) Municipal Separate Storm Sewer System (MS4) permits. In Alaska, stormwater management is critical due to the region's sensitive aquatic ecosystems and seasonal freeze-thaw cycles that affect runoff patterns. The facility likely employs best management practices (BMPs) such as sedimentation basins or vegetated swales to control pollutants before discharge. The scale of this outfall is typical for a small municipality like Wasilla, which manages stormwater from roads, residential areas, and commercial zones. Environmental significance includes the potential impact on downstream water bodies, such as Knik Arm of Cook Inlet, which supports salmon and other marine life. Proper stormwater management helps reduce sediment, oil, and other pollutants from entering these waters. The facility's compliance with MS4 permit requirements is essential for protecting local water quality and aquatic habitats.
Environmental context
The KNIK PIT outfall discharges into the Knik Arm watershed, which is part of the Cook Inlet basin. This area supports critical salmon habitats and is subject to seasonal variations in flow and pollutant loading from urban runoff. The Matanuska-Susitna Borough's growing population increases impervious surfaces, elevating stormwater runoff volumes and pollutant risks. Regulatory compliance under the NPDES MS4 program aims to mitigate these impacts through structural and non-structural controls.
Frequently asked questions
KNIK PIT is located at Mile 13.7 Knik Goose Bay Road in Wasilla, Alaska, within the Matanuska-Susitna Borough.
KNIK PIT is a stormwater outfall that discharges collected stormwater runoff from urban and transportation areas into the local watershed, helping manage flood risk and water quality.
Stormwater discharges in Alaska are regulated under the US Clean Water Act through NPDES MS4 permits, which require municipalities to implement stormwater management programs to reduce pollutant runoff.
Typical pollutants include sediment, oil and grease from roads, heavy metals, nutrients, and bacteria from urban runoff. Best management practices help control these pollutants.
Alaska's sensitive aquatic ecosystems, including salmon habitats, are vulnerable to pollution from stormwater runoff. Effective management protects water quality and supports fisheries and community water supplies.
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