Hydrologic Study of Thundering Brook, Killington, Vermont By Kathleen Donna and Sarah King

Outline Introduction Location Map Data Reduction Discussion Conclusion References

Introduction The purpose of this study is to determine the height of the 200 year flood at the Thundering Brook and Ottaquechee River Drainage basin Section of Appalacian Trail must be moved Flow records of Vermont Streams, graphed and analyzed, probability analysis Manning Equation used to determine the depth of the flood water Depth of flood water used to determine height of boardwalk

Location Map

Data Reduction Flow data collected from 27 gaged Vermont streams

Data Reduction Calculated recurrence interval and probability

Data Reduction Plotted discharge vs. probability, estimations

Data Reduction Plotted discharge/area relation graphs, estimations

Data Reduction Manning Equation Calculations

Data Reduction Manning Coefficient Sensitivity Test (Dunne and Leopold)

Discussion Sensitivity Test Boardwalk design flood depth

Conclusion Storage area capacity The analysis of a range of floods and their estimated probabilities is an acceptable flood-prediction method (NRC)

References USGS (2002) National Research Council (1988) Estimating Probabilities of Extreme Floods, National Academy Press, Washington, DC Dunne, Thomas and Leopold, Luna B. (1998) Water in Environmental Planning, W. H. Freeman and Company, New York.