Using the modified agricultural non-point source pollution model in Germanwatersheds

The modified agricultural non-point source pollution model (AGNPSm) was use d in this study to predict runoff volume, peak flow rate, and sediment yiel d in three different watersheds in Germany. It is a distributed parameter s oil erosion model which uses simple approaches to hydrological and sediment calculations. Simulations were carried out in the Glonn G1 (1.2 km(2)), an d Glonn G2 (1.6 km(2)), and the Salzboede (81.7 km(2)) watersheds in German y. Runoff volume was predicted reliably in all three watersheds. Sediment y ield predictions were excellent in the Glonn G1 and acceptable in the Glonn G2 watersheds. There were some uncertainties in the sediment yield calcula tions for the Salzboede watershed. This study shows that a less complex soi l erosion model such as AGNPSm is able to produce reliable assessments of n on-point source pollution for planning purposes. (C) 1999 Elsevier Science B.V. All rights reserved.