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2015 Sweet Home Mitigation Plan August 2015

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2015 Sweet Home Mitigation Plan August 2015 SWEET HOME MITIGATION PLAN A MULTI-HAZARD MITIGATION PLAN CITY OF SWEET HOME, OREGON Updated August 2015 Cover Photo: Foster Dam and Reservoir East and Upstream of the City of Sweet Home City of Sweet Home August 2015 Sweet Home Mitigation Plan August 2015 ACKNOWLDEGEMENT This Sweet Home Mitigation Plan (SHMP) was formerly known as the Sweet Home Multi- Hazard Mitigation Plan. The original Multi-Hazard Mitigation Plan was first researched and written in 2003-2004 by Goettel and Associates Inc.1 with vigorous review and input of local knowledge and values by concerned citizens on the Mitigation Committee, and in public meetings, as well as by the dedicated City staff that participated in the ongoing planning process over many months of effort. This Plan has been updated at five year intervals since 2004 with contemporary information, data, and citizen/staff input. Yet, Ken Goettel’s original insights and work on hazard mitigation planning continue to form the foundation of these updated City of Sweet Home mitigation plans and the ongoing mitigation planning efforts of the community. TCL Planning Consultants2 assisted Ken Goettel in the 2003-2004 process by working on background information and related hazard assessment documents. The City of Sweet Home asked TCL to facilitate this 2015 update; this new update of the SHMP remains in keeping with Goettel’s original work. 1 Goettel & Associates Inc.: 530-750-0440; http://www.kengoettel.com/ ; 1732 Arena Drive Davis, CA 95618. 2 TCL Planning Consultants (T. & C. Lewis): Sweet Home, Oregon. City of Sweet Home August 2015 Sweet Home Mitigation Plan August 2015 EXECUTIVE SUMMARY OVERVIEW OF THE SWEET HOME MITIGATION PLAN (SHMP) The Sweet Home Mitigation Plan was formerly known as the Sweet Home Multi-Hazard Mitigation Plan. The SHMP is, of course, still a multi-hazard mitigation plan for the City of Sweet Home and covers each of the major natural and human-caused hazards that pose risks to the City. The primary objectives of this Sweet Home Mitigation Plan (SHMP) are to reduce the negative impacts of future disasters on the community, including: (1) saving lives and reducing injuries; (2) minimizing damage to buildings and infrastructure (especially critical facilities); and, (3) minimizing economic losses. This Mitigation Plan is a planning document, not a regulatory document. The SHMP meets FEMA’s planning requirements by addressing hazards, vulnerability and risk. In this document the following working definitions are used: Hazard -- the frequency and severity of disaster events; Vulnerability -- the value, importance, and fragility of buildings and infrastructure; Risk -- the threat to people, buildings and infrastructure, taking into account the probabilities of disaster events. Adoption of a multi-hazard mitigation plan is required for communities to remain eligible for future FEMA mitigation grant funds. This City of Sweet Home Mitigation Plan includes the following parts and chapters: Cover Acknowledgement Copy of City Council Resolution of Adoption Executive Summary Table of Contents Chapter 1: Introduction Chapter 2: Community Profile: City of Sweet Home Chapter 3: Community Involvement and Public Process Chapter 4: Mission Statement, Goals, Objectives and Action Items Chapter 5: Plan Adoption, Implementation, and Maintenance Chapter 6: Floods Chapter 7: Severe Storms Chapter 8: Landslides Chapter 9: Wildland/Urban Interface Fires Chapter 10: Earthquakes Chapter 11: Volcanic Hazards Chapter 12: Dam Failures Chapter 13: Disruption of Utility and Transportation Systems Chapter 14: Hazardous Materials Chapter 15: Terrorism Appendices Appendix 1: Synopsis of FEMA Grant Programs Appendix 2: Principles of Benefit-Cost Analysis Appendix 3: Community Involvement Documentation City of Sweet Home August 2015 Sweet Home Mitigation Plan Page ES - i CHANGES MADE TO THE 2009 SHMP IN THE 2015 UPDATED SHMP The entire document has been proofed and edited for clarity and grammatical correctness. The following table describes the substantive changes made to the 2009 Plan for the 2015 Update. Substantive Changes made to the 2009 Plan for the 2015 Update (see Table 3-1) (For detailed changes in Mitigation Action Items, see Table 4-1, page 4-4 in Chapter 4.) Chapter Section Substantive Changes Acknowledgements xxxxxxx Acknowledgment added Adopt Resolution xxxxxxx Copy of Signed Resolution of Adoption (by City Council) moved from end of Chapter 5 Executive Sum xxxxxxx Executive Summary updated Table of Cont. xxxxxxx Table of Contents updated 1 1.4 Added Subsection titles and new Figure 1-1 (page 1-3) and 1-2 (page 1-4) 1 1.7 Hazard cross indexing added (2004-2015 Mitigation Plan with 2012 EOP) 1 1.8 Section # & title added – outline of the rest of the document 2 2.1 Updated demographic information with 2010 and 2011 data 2 2.4 Update housing data to 2010 and 2012 data New subsection 3.1 (Overview) & other subsections re-numbered; Updated information on 3 3.1 public process, including participation and notifications Updated information and subsection tiles added: pre-1996, 1996 & following; 2009 update 3 3.2 process 3 3.3 Updated the Sweet Home Mitigation Planning Committee (SHMPC) information 3 3.4 2015 Updated the process information 3 3.4.1 Updated change tracking for 2015 Plan 3 3.4.2 Updated Resources and References 4 4.1 Refined Objectives 4 4.4 Clarification in wording of Goal 4, and Objectives A & B for Goal 6 (page 4-3). 4 4.5 Updated Mitigation Action Items (see Table 4-1) 4 Table 4-2 Multi-Hazard: Table updated, modified to more directly represent Plan Goals Flood - inside FEMA Mapped flood plain: Table updated, modified to more directly 4 Table 4-3 represent Plan Goals Flood - outside FEMA Mapped flood plain: Table updated, modified to more directly 4 Table 4-3 represent Plan Goals 4 Table 4-4 Severe Storm: Table updated, modified to more directly represent Plan Goals 4 Table 4-5 Landslide: Table updated, modified to more directly represent Plan Goals Wildland/Urban Interface Fire: Table updated, modified to more directly represent Plan 4 Table 4-6 Goals 4 Table 4-7 Earthquake: Table updated, modified to more directly represent Plan Goals 4 Table 4-8 Volcanic Hazards: Table updated, modified to more directly represent Plan Goals 4 Table 4-9 Dam Failure: Table updated, modified to more directly represent Plan Goals 4 Table 4-10 Utility - Transportation: Table updated, modified to more directly represent Plan Goals 4 Table 4-11 Hazmat: Table updated, modified to more directly represent Plan Goals 4 Table 4-11 Terrorism: Table updated, modified to more directly represent Plan Goals 5 5.2 Updated adoption information 5 5.3.1 Added information on process for updating existing mechanisms 5 5.3.1 Added information: completed South Santiam Watershed Council project (Ames Creek) 5 5.4 Updated maintenance schedule (summarized in Table 5-2, on page 5-6) 6 6.1 Updated date of the Sweet Home Flood Insurance Study 6 6.2.1 Updated information on the Flood Insurance Rate Map designations 6 6.2.2 Updated information from the Flood Insurance Rate Map 6 6.2.3 Updates events since 2009 6 6.5 Updated the number of policies in the NFIP in 2013 6 Table 6-2 Table modified to more directly represent Plan Goals [Mitigation Action Items updated] New Now titled “Severe Storms.” Previously this chapter had been entitled “Winter Storms,” but has been 7 Chapter renamed in recognition of the fact that although severe storms are more likely to occur in the winter Title months, they can occur during any season of the year. 7 7.1 Updated tornado information 7 7.2.2 Updated wind hazard data 7 7.2.3 Updated web page information and severe storm data City of Sweet Home August 2015 Sweet Home Mitigation Plan Page ES - ii Substantive Changes made to the 2009 Plan for the 2015 Update (see Table 3-1) (For detailed changes in Mitigation Action Items, see Table 4-1, page 4-4 in Chapter 4.) Chapter Section Substantive Changes 7 7.2 Subsections 7.2.4 & 7.2.5 (page 7-6) added (updates events since 2009) 7 7.2.3 Updated historical severe storm data 7 Table 7-5 Table modified to more directly represent Plan Goals [Mitigation Action Items updated] 8 8.3 Inserted update to 2009 8 8.3-8.4 Subsections renumbered as 8.4 and 8.5 8 Table 8-2 Table modified to more directly represent Plan Goals [Mitigation Action Items updated] 9 9.1 Subsection 9.1 “Overview” title inserted 9 9.1-9.5 All subsections renumbered 9 9.2 Updated NFPA data to 2011 9 9.2.1 Updated NFPA data to 2011 9 9.2.2 Updated data to 2011 9 9.4 Updated Historical Data for Wildland Fires in Oregon 9 9.5 Added Sweet Home Fire and Ambulance District Data for 2012 9 Table 9-4 Added Wildland and Wildland/Urban Fires in Linn County in ODF Protection Areas table 9 Table 9-5 Added distribution of fire sizes table 9 9.5 Subsection renumbered as 9.7 9 9.6 Inserted update to 2012 9 Table 9-8 Table modified to more directly represent Plan Goals [Mitigation Action Items updated] 10 Table 10-2 Updated USGS Seismic Hazard Data for Sweet Home 10 Table 10-4 Updated USGS Seismic Hazard Map for Oregon 10 10.3 Updated Figure 10-3 with USGS 2012 Oregon Seismicity Map 10 10.3 – 10.8 Subsections renumbered. 10 10.3 Added information on earthquake events since 2009 10 10.5 Updated building damage estimates, injuries, and deaths estimates 10 Table 10-3 Updated M8.5 Cascadia Subduction Zone Interface Earthquake table 10 Table 10-4 Updated M7.5 Cascadia Subduction Zone Intraplate Earthquake table 10 10.7.1 Updated information on water treatment plant 10 Table 10-6 Table modified to more directly represent Plan Goals [Mitigation Action Items updated] 11 11.3 Added information on volcanic events since 2009 11 11.4 – 11.5 Subsections renumbered.
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