2005 Annual Report 4d.Progress report. This report serves to document research conducted under a specific cooperative agreement #58-5342-1-0214 between ARS and the University of Arizona. Additional details of research can be found in the report for the parent project 5342-12660-003-00D "Soil erosion, sediment yield and decision support systems for sustainable management of semiarid rangeland watersheds." This project supports primarily the goals of objective 2C of the parent project, specifically: "Using information from the (other project goals) to evaluate and modify existing erosion models for application on rangelands" A prototype Rangeland Hydrology and Erosion Model was developed based on the WEPP technology for predicting soil erosion rates by water for individual storm events. This model is intended to be available for use by NRCS for use in future National Resource Inventories. This is being done in cooperation with the ARS location in Boise, ID and NRCS in Ft. Worth, TX.. A second model was developed and integrated in order to improve the dynamic KINEROS model for research applications. Intentions are to incorporate this model into the AGWA framework.