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Total Maximum Daily Load (TMDL) Environmental Regulations II
Non-point sources of pollutants originate at the field scale but water quality problems usually occur at the watershed or basin scale. This paper describes a series of models developed for poorly drained watersheds. The models use DRAINMOD to predict hydrology at the field scale and a range of methods to predict channel hydraulics and nitrogen transport. In-stream changes of N load are estimated with a lumped parameter exponential decay function. The models were tested using data from a 10,000doi:10.13031/2013.15594 fatcat:t76xzqjnovevdlhdkbk3crmc5u