Overview
TONKA is an operational stormwater outfall in the Petersburg Census Area, Alaska, United States. It serves as a discharge point for stormwater runoff in a region with sensitive aquatic ecosystems.
TONKA is a stormwater outfall located in the Petersburg Census Area, Alaska, United States. As a stormwater outfall, it functions as a discharge point for stormwater runoff from the surrounding catchment area. The facility is operational and falls under the regulatory framework of the US Clean Water Act, which governs stormwater discharges through the National Pollutant Discharge Elimination System (NPDES) permit program. Stormwater outfalls like TONKA are typically part of municipal separate storm sewer systems (MS4s) or industrial stormwater management systems. In Alaska, stormwater management is critical due to the state's unique hydrology and sensitive ecosystems. The facility's location in a census area suggests it may serve a rural or remote community, where stormwater infrastructure is essential for flood control and water quality protection. The environmental significance of TONKA lies in its role in managing stormwater runoff, which can carry pollutants such as sediment, nutrients, and heavy metals into receiving waters. Proper operation and maintenance of the outfall help protect downstream water bodies, including salmon-bearing streams and marine habitats that are vital to the region's ecology and economy.
Environmental context
The Petersburg Census Area in Alaska features a coastal temperate rainforest climate with high precipitation, leading to significant stormwater runoff. The region's aquatic ecosystems, including salmon streams and marine waters, are sensitive to pollution from urban and industrial runoff. Stormwater outfalls like TONKA must comply with NPDES permit requirements to minimize impacts on water quality and aquatic life.
Frequently asked questions
TONKA is located in the Petersburg Census Area, Alaska, United States, at coordinates 56.712800 N, -132.952000 W.
TONKA is a stormwater outfall that discharges stormwater runoff from its catchment area into receiving waters, helping to manage flood risk and convey runoff away from developed areas.
Stormwater outfalls in Alaska are regulated under the US Clean Water Act through the NPDES permit program, which includes requirements for MS4s and industrial stormwater discharges to protect water quality.
Stormwater runoff can carry pollutants like sediment and chemicals that degrade salmon spawning and rearing habitats. Proper management of outfalls like TONKA helps minimize these impacts and supports healthy salmon populations.
Common pollutants include sediment, nutrients (nitrogen and phosphorus), heavy metals, oil and grease, pathogens, and debris, which can harm aquatic ecosystems and water quality.
Other Stormwater Outfall plants in United States · 6 nearby