The use of WEPP (Water Erosion Prediction Project) in the Upper South Amana catchment in Clear Creek intends to address different fundamental questions regarding the effects of a storm magnitude comparatively to the storm duration as it relates to NPS. This investigation also examines the dependency of the sediment delivery process on landform geometry and cover; the identification of the equilibrium conditions for precipitation, surface runoff; the importance of equilibrium conditions for pollutant transport predictions; and finally how much sediment reaches into the Clear Creek and what are the sediment delivery ratios. Use of WEPP allows us to indirectly ad

dress some other questions: How frequently should we monitor our rivers and lakes in order to establish standards for sediment and nutrients? Is the monthly recording of parameters such as turbidity, TP, an adequate measure for establishing criteria, or more frequent measurements are necessary? Do we need to use NPS predictions obtained under equilibrium conditions to meet different EPA standards? It was found that the equilibrium WEPP simulations can be used for setting NPS criteria. The strong event simulation can be used to evaluate the efficiency of different BMPs. Furthermore, the novel capabilities to be sought in the future are applications of WEPP simulations that can dynamically accept responses to online field data and measurements and/or control such measurements. This synergistic and symbiotic feedback control loop between simulation and measurements is a novel technical direction that can open domains in the capabilities of simulations within watersheds and can facilitate the capturing of episodic and catastrophic events. This control loop is not currently available for simulating natural processes.