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

2. Outline Introduction Location Map Data Reduction Discussion Conclusion References

3. 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

4. Location Map

5. Data Reduction Flow data collected from 27 gaged Vermont streams

6. Data Reduction Calculated recurrence interval and probability

7. Data Reduction Plotted discharge vs. probability, estimations

8. Data Reduction Plotted discharge/area relation graphs, estimations

9. Data Reduction Manning Equation Calculations

10. Data Reduction Manning Coefficient Sensitivity Test (Dunne and Leopold)

11. Discussion Sensitivity Test Boardwalk design flood depth

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

13. References USGS (2002) http://water.usgs.gov/vt/nwis/peak?… 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.