Abstract: Closing Plenary Session 8:30 am (BACK)
Eco-Geomorphic Rapid Assessment Approaches for Evaluating Stream Restoration Effectiveness
Greg Jennings, PhD, PE
Stantec Consulting, Inc.
Authors: Greg Jennings, Stantec Consulting, Inc., Barbara Doll, North Carolina State University, David Penrose, Watershed Science
Field assessments, macroinvertebrate metrics, and GIS watershed assessments were applied to evaluate functional uplift of 85 restored streams in North Carolina. Five rapid stream assessment procedures were compared for their ability to measure stream condition based on macroinvertebrate communities. Principal component analysis and principal component regression indicated that the addition of watershed condition variables improved correlation among assessments and macroinvertebrate metrics. Ordination of assessment data from 156 restored, reference, and impaired streams indicated that restored streams are similar to reference streams. Factor analysis revealed that restored streams have morphologic conditions similar to reference streams, but exhibit greater variability in aquatic habitat and bedform. Ridge regression was used to predict EPT taxa for restored streams. Predictions indicate that urban streams have lower expected numbers of EPT taxa, and rural restored streams have EPT numbers similar to rural reference streams. Ridge regression was used to predict dominant EPT taxa, indicating that larger streams in steeper valleys with larger substrate and un-developed watersheds have higher numbers of EPT taxa. Also, greater floodplain widths correlate with higher EPT taxa.