Comparing Design Methods for Restoring Small Streams in NC's Coastal Plain

Two stream restoration projects were recently designed and constructed in the coastal plain of NC. Several popular design approaches were implemented to develop plan parameters. Traditional engineering methods, natural channel design methods, and analytical approaches were utilized. The results of each approach were compiled for comparison and to improve design confidence. This paper includes a description of the methods employed, the limitations encountered, and an evaluation of the results. Each method presents challenges in terms of data collection, effort, and the experience required. Information on these limitations should be incorporated in design approach and application decisions. Based on initial findings, it appears that design differences for small streams with relatively stable watersheds may not exceed expected variability. However, this may not be the case for larger streams as differences increased with watershed size and complexity. It is suggested that completing similar initial estimates will improve design decisions, confidence, and reduce risk. As the science of stream restoration progresses, more quantitative comparisons of this type will provide designers with the information needed to guide complex approach decisions.