Abstract
Until recently, no suitable computer model was available to quantify P and N yields of nonpoint sources into surface water in Central German watersheds. The event-based erosion; and nutrient transport model AGNPS (Version 3.65), developed in the USA, was adapted to Central German landscape conditions and linked to a GIS. Drawing on a two-year program of water quality measurements and on hydrologic data collected over 33 years, this modified model was tested in two medium-sized agricultural watersheds in the state of Hesse (Germany). With deviations of 1.796 and 3.896, runoff volumes for all observed and simulated flood events showed a high level of agreement in both watersheds. Only for one of the two watersheds were sediment and total phosphorus yield computed satisfactorily, with average errors of 596 (sediment) and 696 (total P). However, the model correctly registered the overall dynamics of the system as well as the differences of sediment and total P yield between the two watersheds. The modified AGNPS model can thus be employed by environmental agencies as a useful planning tool.
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