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ANSWERS-2000, a non-point source planning model was modified to simulate long-term nitrogen and phosphorus transport from rural watersheds. The model simulates infiltration, evapotranspiration, percolation, and runoff and losses of nitrate, adsorbed and dissolved ammonium, adsorbed total Kjeldahl N, and adsorbed and dissolved P losses. The model was validated on two small watersheds without calibration and on a large watershed with calibration. Predicted cumulative of dissolved and adsorbed nutrients losses were within a factor of two of observed values. In a practical application, the use of the model in evaluating the cost effectiveness of alternative management scenarios was demonstrated.

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Authors: BOURAOUI F, JRC-Environment Institute, Ispra (IT);DILLAHA T, Virginia Tech, Blackburg (US)
Bibliographic Reference: Article published in: Journal of Environmental Engineering, November 2000, pp1045-1055
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