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Town of Shaftsbury Hazard Mitigation Plan Shaftsbury, Vermont

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Town of Shaftsbury Hazard Mitigation Plan Shaftsbury, Vermont Town of Shaftsbury Hazard Mitigation Plan Shaftsbury, Vermont Draft: February 3, 2021 Table of Contents A. Purpose ........................................................................................................................................... 1 B. Mitigation Goals ............................................................................................................................. 2 II. Town Profile ................................................................................... 2 A. Regional Context ............................................................................................................................ 2 B. Demography and Land Use ............................................................................................................. 2 C. Economic and Cultural Resources .................................................................................................. 3 D. Critical Facilities .............................................................................................................................. 3 III. Planning Process ............................................................................ 4 A. Planning Team ................................................................................................................................ 4 B. Public Involvement ......................................................................................................................... 4 IV. Hazard Assessment ............................................................................. 5 A. Hazard Assessment ........................................................................................................................... 5 B. Flooding and Fluvial Erosion ............................................................................................................. 6 C. Winter Storms ................................................................................................................................. 14 D. High Wind Events ............................................................................................................................ 18 E. Hail .................................................................................................................................................. 23 F. Temperature Extremes ................................................................................................................... 23 G. Drought ........................................................................................................................................... 25 H. Wildfire ........................................................................................................................................... 28 I. Earthquake ...................................................................................................................................... 30 J. Landslide ......................................................................................................................................... 33 K. Invasive Species .............................................................................................................................. 35 L. Hazardous Material Spill ................................................................................................................. 38 M. Infectious Disease Outbreak ........................................................................................................... 45 V. Vulnerability Assessment ................................................................. 47 A. Prioritization of Hazards ................................................................................................................. 47 B. Priority Hazards ............................................................................................................................... 47 VI. Mitigation Measures ......................................................................... 48 A. Hazard Mitigation Goals ................................................................................................................. 48 B. 2014 Shaftsbury Hazard Mitigation Plan ........................................................................................ 49 C. 2019 Shaftsbury Town Plan ............................................................................................................ 51 D. Shaftsbury Zoning Bylaws ............................................................................................................... 51 E. Stormwater Management .............................................................................................................. 51 F. State and Regional Plans and Programs ......................................................................................... 53 G. Town Capabilities ............................................................................................................................ 55 H. Mitigation Projects .......................................................................................................................... 56 VII. Plan Maintenance ........................................................................ 72 A. Annual Monitoring and Continued Public Involvement ............................................................... 72 B. Plan Evaluation and Update ......................................................................................................... 72 C. Post Disaster Review and Revision ............................................................................................... 73 VIII. References ................................................................................... 74 A. Literature and Reports .................................................................................................................... 74 B. Map Data Sources ........................................................................................................................... 78 C. Personal Communication Sources .................................................................................................. 79 Tables Table 1. Shaftsbury critical facilities (see Map 4). ........................................................................................ 3 Table 2. Planning committee members ........................................................................................................ 4 Table 3. Dates of planning meetings and public and agency review ............................................................ 4 Table 4. Total number of flood events by type and year for Bennington County. ....................................... 8 Table 5. Months where rainfall exceeded the 90th percentile (precipitation totals, in inches, in parentheses) of monthly precipitation at the Peru, Pownal and Sunderland Cooperative Observer Stations from 1990 to 2013 for Pownal, 1980 to 2017 for Peru and 1990 to 2013 for Sunderland. ......... 11 Table 6. Structures by type in flood hazard zones in Shaftsbury, VT. ......................................................... 13 Table 7. Total number of winter storm events by type and year for Bennington County. ........................ 14 Table 8. Summary of wind events in Bennington County. .......................................................................... 19 Table 9. Bennington and Sunderland normal temperatures and precipitation for 1981 to 2010. ............ 24 Table 10. Years and number of months when the PHDI indicated severe or extreme droughts from 1895 to 2019. ....................................................................................................................................................... 26 Table 11. Wildland fire size classes. ............................................................................................................ 28 Table 12. Earthquake magnitude and intensity scale descriptions. ........................................................... 30 Table 13. Earthquakes in Vermont. Source: Vermont Geological Survey (Ebel et al. 1995) ...................... 33 Table 14. Landslide and debris flow types. ................................................................................................. 34 Table 15. Designated Class A noxious weeds.............................................................................................. 35 Table 16. Designated Class B noxious weeds in Vermont. ......................................................................... 36 Table 17. Aquatic invasive species in Vermont. .......................................................................................... 37 Table 18. Hazardous materials spills in Shaftsbury, VT ............................................................................... 40 Table 19. Vulnerability assessment factors (Vermont Hazard Mitigation Plan 2018) ................................ 47 Table 20. Vulnerability assessment ............................................................................................................ 48 Table 21. Road erosion survey results ........................................................................................................ 52 Table 22. Comparison of hazards considered in the 2018 Vermont Hazard Mitigation Plan vs. the Shaftsbury Hazard Mitigation Plan ............................................................................................................. 53 Table 23. Capabilities of the Town of Shaftsbury ......................................................................................
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