Integrated Technology for Evaluation and Assessment of Multi-Scale Hydrological Systems in Managing Nonpoint Source Pollution

Conservation agencies need information to guide planning activities and allocation of limited mitigation resources at regional scales. Utilization hydrological modeling tools sub-watershed scales can adequately represent existing conditions, but on a few discrete uncoordinated efforts cannot be scaled up the entire region. Conversely, large scale studies suffer from overgeneralization caused by needed lumping information. In this study, multiscale standardized procedure was sought characterize water nonpoint source pollution spatiotemporal dynamics basin-scale through detailed field-scale analysis. The AnnAGNPS watershed model enhanced with new capabilities for simulation areas based an Integrated Technology Evaluation Assessment Multi-scale-hydrological Systems (ITEAMS) approach. Comparisons between standard proposed ITEAMS approach indicated no difference in streamflow small underestimation suspended sediments during high intensity rainfall events. applied basin total area 3,268,691 ha which discretized into 469,628 sub-catchments average size 6.8 ha. resulting 366 linked simulations were executed hierarchically generating estimates sediment yield loads. This pilot study revealed is viable alternative simulating resolution.