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The Watershed Approach to Understanding our Environment¹

ABSTRACT

Current approaches used in modeling a particular part of the human environment—the agricultural watershed—are reviewed and questions are raised regarding the objectives, approaches, and interpretation of agricultural water quality models. Models—either symbolic (mathematical) or material—are essential to understanding and predicting environmental phenomena on agricultural watersheds. Models describing the transport of water, sediment, and chemicals through a watershed system can become very complicated and frequently must be simplified. Simplifications inevitably involve distortion and may make interpretation of model parameters difficult. The use of material models may assist in interpreting the parameters of mathematical models.

Key Words: modeling • simulation • water quality • hydrology

¹ Contribution from Agricultural Research Service, USDA, in cooperation with the Colorado State University Agr. Exp. Sta.

² Research Hydraulic Engineer, USDA, Fort Collins, CO 80523.

Received for publication February 12, 1974.

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