Long Prairie River Watershed Total Maximum Daily Load For Dissolved Oxygen

A total maximum daily load (TMDL) is the amount of a pollutant that a water body can assimilate without exceeding the established water quality standards for that pollutant. Through a TMDL, pollutant loads can be distributed or allocated to point and non-point sources within the watershed that discharge to the water body. This report presents TMDLs developed for maintenance of the dissolved oxygen (DO) standard in the Long Prairie River in central Minnesota. Because ammonia is both an oxygen-demanding substance and a potential toxin, ammonia toxicity was evaluated in those reaches impacted by municipal waste discharges.