10.4122/1.1000001177 Quigley, M.M. Strecker, E.W. Leisenring, M. Huber, W.C. Heaney, J. Weinstein, N. Sansalone, J. Bodine, D. The integrated unit process design approach for source control and best management practice design DTU Library, Technical University of Denmark (DTU) 2005 Best management practice source control unit process wet weather treatment urban runoff design methodology GeoSyntec Consultants, Acton, Massachusetts GeoSyntec Consultants, Portland, Oregon Oregon State University University of Florida, Environmental Engineering Sciences Low Impact Development Center Louisianna State University, Department of Civil and Environmental Engineering Aquatus Environmental en Conference presentation 10.4122/1.1000001178 text/xml 1 Research being conducted by the authors under the National Cooperative Highway Research Program project \342\200\234Evaluation of Best Management Practices for Highway Runoff Control\342\200\235 and the Water Environment Research Foundation project \342\200\234Critical Assessment of Stormwater Treatment and Control Selection Issues\342\200\234 seeks to advance the state of the practice of stormwater design through the application of basic scientifically and technically sound engineering principals using a fundamental unit process design methodology. The research findings are being incorporated into guidance manuals aimed at both the design of highway runoff controls and, in the case of the WERF guidance documents, stormwater treatment approaches. The intent of these manuals is to provide a means for better applying research on the relationship between design and performance specifically emphasizing the importance of matching water quality goals to fundamental unit processes. To that end, the research discussed in this paper has integrated findings from a number of sources including work by the authors conducted as part of the International Stormwater Best Management Practices Database project as well as the above referenced projects. The paper pays particular attention to elucidating the current state of the practice relative to the availability of sources of performance information.