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The Needs for Water Quality Models on Agricultural Watersheds¹

ABSTRACT

Man's agricultural activities contribute pollutants to surface and ground water. Preservation of water quality requires greater effort to control these pollutants including eroded soil, agricultural chemicals, oxygen-demanding organic wastes, and sometimes heavy metals and pathogens.

Management of nonpoint source agricultural pollutants will require the management of runoff or vertical movement from the source, the efficient selection and use of appropriate pesticides and fertilizers, and the retention of animal wastes and plant residues on the land. Management programs should be planned for complete drainage basins making use of existing conservation programs. Mathematical models now under development will augment current management practices and will enable the application of computer technology to prediction of the consequences of agronomic practices.

Key Words: nonpoint source • point source • Federal Water Pollution Control Act • modeling

¹ Contribution from the Southeast Environmental Research Laboratory, Nat. Environ. Res. Center-Corvallis, U.S. EPA, Athens, Ga. 30601.

² Chief, Agro-Environmental Systems Branch.

Received for publication February 8, 1974.