Twin Falls County Multi-Jurisdiction All Hazard Mitigation Plan
Total Page:16
File Type:pdf, Size:1020Kb
TWIN FALLS COUNTY MULTI-JURISDICTION ALL HAZARD MITIGATION PLAN AUGUST 2013 Twin Falls Multi-Jurisdiction All Hazard Mitigation Plan August 23, 2013 Executive Summary The Twin Falls County Multi-Jurisdiction All Hazard Mitigation Plan 2013 is a complete revision of the 2008 Twin Falls County All Hazard Mitigation Plan. The entire Hazard and Vulnerability Assessment was updated. The hazard ranking was changed a new format deployed that ranks the hazards according to five indices, 1) historical occurrence, 2) probability, 3) vulnerability, 4) spatial extent, i.e, the extent impact based on geography, and 5) the magnitude which looks specifically at the loss of life, injuries, and economic impact. The Plan format was changed to match the FEMA Local Plan Crosswalk Guidance. The figure below contains the revised risk ranking for Twin Falls County. Historical Spatial Hazard Probability Vulnerability Magnitude Total Rank Occurrence Extent Drought 3 4 4 4 3 18 H Wildfire 3 4 2 3 4 16 H Severe Weather 3 4 3 3 3 16 H Severe Winter Storms 3 4 2 4 2 15 H Communicable 2 3 3 3 3 14 H Diseases Structural Fire 3 4 1 1 4 13 M H5N1 Bird Flu 0 1 4 4 4 13 M West Nile Virus 3 4 1 1 3 12 M Hazardous Materials 3 4 2 1 2 12 M Terrorism 0 1 4 3 4 12 M Vesicular Stomatitis 2 4 1 1 3 11 M Flood 2 4 1 1 3 11 M Flash Flood 2 4 2 1 2 11 M Canal Failure 2 4 1 1 2 10 M Lyme and Other Tick- 1 4 1 1 3 10 M Borne Diseases Nuclear Event 0 1 3 3 3 10 M Burrowing Rodents 1 4 1 1 2 9 L Earthquake 0 2 1 2 2 7 L Landslide 1 2 1 1 1 6 L Dam Failure 0 1 1 1 3 6 L The Twin Falls County Multi-Jurisdiction All Hazard Mitigation Planning Project was led by Ms. Jackie Frey, Coordinator, Twin Falls County Department of Emergency Services, who, under the direction of the Twin Falls County Commissioners, is responsible for implementing the mitigation actions recommended in this Plan. 1 Twin Falls Multi-Jurisdiction All Hazard Mitigation Plan August 23, 2013 The Twin Falls County All Hazard Mitigation Planning Committee was comprised of members of the Twin Falls County LEPC. Community involvement took two forms, 1) an electronic based community questionnaire, and 2) invitation to attend the local elected officials’ briefings. There was excellent community participation for a county of this size. While the focus of this Plan is on County-wide mitigation activities, it was developed through an integrated effort by representatives from many County jurisdictions. The following Cities and taxation districts have also participated in the development of this Plan: City of Buhl City of Castleford City of Filer City of Hansen City of Hollister City of Kimberly City of Murtaugh City of Twin Falls Buhl Highway District Filer Highway District Murtaugh Highway District Twin Falls Highway District Twin Falls County Pest Abatement District Twin Falls Canal Company Three Creek Rangeland Fire Protection Association, Inc. Saylor Creek Rangeland Fire Protection Association, Inc. Mitigation Actions have been reviewed and a status provided by the Mitigation Committee. Goals and Objectives, as developed in the initially planning process, were maintained and additional mitigation actions added to the Plan. The mitigation actions were reviewed and analyzed using the STAPLEE Method with each action given a H, M, or L ranking. Twin Falls County Projects STAPLEE Score Ranking Install High Wind Warning devices at the entrances of 150 H the Hansen and Perrine Snake River Bridge Organize a group to jointly apply for grants and other funding avenues to implement WUI Fire Mitigation 148.5 H Actions. Emergency Power for Relocation Centers 146 H Maintain the “Fight the Bite” program with the Health 144 H District. Develop an agreement with developers and private landowners for access to and use of water sources for 143 H fire protection. Incorporate new developments and structures into 142 H existing fire protection districts. 2 Twin Falls Multi-Jurisdiction All Hazard Mitigation Plan August 23, 2013 Twin Falls County Projects STAPLEE Score Ranking Establish a National Flood Insurance Program for areas 139 M prone to flash flooding in Buhl and Castleford Develop an ordinance which establishes the road widths, access, water supply, and building regulations 136.5 M suitable to ensure new structures can be protected. Identify all Critical Infrastructure and Facilities in the County and participate with the new BHS Critical 132.5 M Infrastructure Protection Program. Develop a listing of roads, bridges, cattle guards, culverts, and other limiting conditions and incorporate 130 M improvements into the Highway District Transportation Plans. Develop a standard practice for roadside vegetation 126 M management in the Mellon Valley Area. Conduct a Hazardous Materials Commodity Flow 124.5 M Study for the County. Plant Wind Breaks along Highway 93 between 115 M Hollister and Rogerson Develop an ordinance that restricts building on the 107 L Snake River Canyon Rim. Post Evacuation Route Signs directing evacuees to 102 L Relocation Centers Work with the Idaho Department of Agriculture to develop protection measures for livestock from 99.5 L Biological Threats. Publish a special section in newspapers about the actual level of earthquake risk identified in the 2013 97.5 L update. Conduct a Law Enforcement Public Education 88 L Campaign on Civil Disobedience. The Plan as developed is much more user friendly, and designed specifically to enhanced implementation. The jurisdictions have completed many of the mitigation actions and as funding is available, additional mitigation actions will be addressed 3 Twin Falls Multi-Jurisdiction All Hazard Mitigation Plan August 23, 2013 This Page Intentionally Blank 4 Twin Falls Multi-Jurisdiction All Hazard Mitigation Plan August 23, 2013 Table of Contents Executive Summary ........................................................................................................................ 1 Table of Contents ............................................................................................................................ 5 Section 1 Planning Process ............................................................................................................. 9 Introduction ................................................................................................................................. 9 Participating Jurisdictions ......................................................................................................... 10 Twin Falls County All Hazard Mitigation Planning Committee .............................................. 11 AHMP Committee Meetings .................................................................................................... 13 Update Process .......................................................................................................................... 17 Participating Jurisdictions ......................................................................................................... 23 Public Meetings ........................................................................................................ 23 Stakeholder Participation .......................................................................................... 32 Participating Twin Falls County Public Safety Agencies ......................................... 32 Participating Taxation Districts ................................................................................ 36 Participating Private Entities..................................................................................... 37 Public Participation ................................................................................................................... 40 Public Questionnaire ................................................................................................................. 40 Continued Public Participation ................................................................................................. 43 Plan Monitoring and Review .................................................................................................... 43 Section 2 Hazard Identification and Risk Assessment ................................................................. 45 Section 2.1 Weather Hazards .................................................................................................... 46 Severe Weather ......................................................................................................... 46 Severe Winter Storms ............................................................................................... 62 Drought ..................................................................................................................... 68 Section 2.2 Flooding ................................................................................................................. 76 River or Stream Flooding.......................................................................................... 78 Flash Flood................................................................................................................ 80 Dam Failure .............................................................................................................. 84 Canal Failure ............................................................................................................. 89 Section 2.3 Geologic Hazards ................................................................................................... 94 Earthquake ...............................................................................................................