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''See main article: Hydrologic transport model

Water movement is a significant méans by which other material, such as soil or pollutants, are transported from place to place. Initial input to receiving waters may arise from a point source discharge or a line source or area source, such as surface runoff.  Since the 1960s rather complex mathematical models have been developed, facilitated by the availability of high speed computers.  The most common pollutant classes analyzed are nutrients, pesticides, total dissolved solids and sediment.