2007 Annual Report 1a.Objectives (from AD-416) To perform research necessary to enhance the physically based conceptual formulations of riparian processes, fractional sediment transport capacity predictions, and sediment yield from gully erosion within the AGNPS and CONCEPTS modeling systems. 1b.Approach (from AD-416) ARS will utilize the research facilities of the ARS National Sedimentation Laboratory to conduct experimental and modeling studies to document the effectiveness of various riparian treatment alternatives, the redistribution of fractional sediment transport capacity processes within varying streamflows, and erosion rates from gully sources. Results will be synthesized into efficient algorithms for the AGNPS and CONCEPTS models. 3.Progress Report This report serves to document research conducted under a Reimbursable Cooperative Agreement between ARS and USDA-Natural Resources Conservation Service (NRCS). Additional details of research can be found in the report for the in-house project 6408-13000-017-00D, "Integrated Assessment and Analysis of Physical Landscape Processes that Impact the Management Of Agricultural Watersheds." Monitoring activities were performed through quarterly conference calls with the cooperators. Computer technology describing ephemeral gully processes was developed for the USDA watershed simulation model AnnAGNPS based on the revised ephemeral gully model (REGEM). This technology can be used to quantify the effects of management practices on the erosion produced from ephemeral gullies within watersheds. Federal, state, and local agencies evaluating the effects of conservation practices on controlling erosion can use this technology in their watershed planning projects. Technical assistance was provided to NRCS in several projects involving watershed assessment of conservation management practices. The integration of the channel evolution model CONCEPTS and riparian ecosystem management model REMM has been enhanced, and the resulting model was used to quantify the impact of woody and herbaceous riparian vegetation on channel morphology. This integrated channel and riparian model provides federal, state, and local agencies active in stream restoration a means to study the effectiveness of different riparian management practices in reducing streambank erosion.