Knox County, City of Knoxville, and Town of Farragut Multi-Jurisdictional Local Hazard Mitigation Plan September 2011 Developed by Knox County, City of Knoxville, and Town of Farragut with professional planning assistance from AMEC Earth and Environmental, Homeland Security, and Emergency Management SPECIAL THANKS AND ACKNOWLEDGEMENTS Knox County Hazard Mitigation Planning Committee Name Representing Jon Livengood City of Knoxville Chad Weth City of Knoxville Lisa Hatfield City of Knoxville Bruce Giles First Utility District Craig Mayes First Utility District Billie Spicuzza KCDC Garrett McKinney KGIS Keith Stump KGIS Ellen Jenny Knox County Air Quality Roy Braden Knox County Code Administration John Sexton Knox County Engineering Eddy Roberts Knox County Engineering/Stormwater Larry Hutsell Knox County Health Department Eric Hahn Knox County Parks/Rec Craig Leuthold Knox County Property Assessor Janet Drumheller Knox County Public Library Jerry Harnish Knox County Rural/Metro Fire Department Robert B. Sexton Knox County Sheriff Michael Hamrick Knox County Stormwater Chris Granju Knox County Stormwater Alan Lawson Knox EMA Roger Byrd Knoxville Fire Department Nate Allen Knoxville Fire Department Mark Donaldson Knoxville-Knox County MPC Kim Sepesi Rural Metro Jim Carico Rural Metro Daniel Johnson Rural/Metro - Town of Farragut Dennis Rowe Rural/Metro EMS Pete Lemiszki TDEC-Geology Division Darryl Smith Town of Farragut Chris Jenkins Town of Farragut Sue Stuhl Town of Farragut Ruth Hawk Town of Farragut Elliott Sievers Town of Farragut Chris Butler and Cindy Popplewell, AMEC Earth and Environmental Knox County, Tennessee i Multi-Jurisdictional Local Hazard Mitigation Plan September 2011 TABLE OF CONTENTS Executive Summary ................................................................................. iv Prerequisites ............................................................................................ vi Chapters 1 Introduction and Planning Process ................................................... 1.1 1.1 Purpose ............................................................................................................................................... 1.1 1.2 Background and Scope ..................................................................................................................... 1.1 1.3 Plan Organization ............................................................................................................................... 1.2 1.4 Planning Process ............................................................................................................................... 1.3 1.4.1 Multi-Jurisdictional Participation ................................................................................................. 1.3 1.4.2 The Planning Process ................................................................................................................ 1.4 2 Planning Area Profile and Capabilities .............................................. 2.1 2.1 Knox County Planning Area Profile ................................................................................................. 2.1 2.1.1 Geography and Topography....................................................................................................... 2.1 2.1.2 Climate ........................................................................................................................................ 2.3 2.1.3 Population/Demographics .......................................................................................................... 2.3 2.1.4 History ......................................................................................................................................... 2.4 2.1.5 Economy/Industry ....................................................................................................................... 2.4 2.1.6 Agriculture................................................................................................................................... 2.5 2.2 Jurisdictional Descriptions and Capabilities ................................................................................. 2.7 2.2.1 Knox County ............................................................................................................................... 2.7 2.2.2 City of Knoxville ........................................................................................................................ 2.11 2.2.3 Town of Farragut ...................................................................................................................... 2.14 3 Risk Assessment ................................................................................ 3.1 3.1 Hazard Identification .......................................................................................................................... 3.2 3.1.1 Review of State Hazard Mitigation Plan ..................................................................................... 3.2 3.1.2 Disaster Declaration History ....................................................................................................... 3.2 3.2 Hazard Profiles ................................................................................................................................... 3.8 3.2.1 Dam Failure .............................................................................................................................. 3.11 3.2.2 Drought ..................................................................................................................................... 3.29 3.2.3 Earthquake ............................................................................................................................... 3.19 3.2.4 Expansive Soils ........................................................................................................................ 3.36 3.2.5 Extreme Temperatures ............................................................................................................. 3.39 3.2.6 Flood ......................................................................................................................................... 3.47 3.2.7 Land Subsidence/Sinkholes ..................................................................................................... 3.66 3.2.8 Landslide .................................................................................................................................. 3.70 3.2.9 Severe Storms (Hail, High Winds & Lightning) ......................................................................... 3.77 3.2.10 Tornadoes............................................................................................................................... 3.85 Knox County, Tennessee ii Multi-Jurisdictional Local Hazard Mitigation Plan September 2011 3.2.11 Wildfire .................................................................................................................................... 3.92 3.2.12 Winter Storms ......................................................................................................................... 3.95 3.2.13 Hazard Profiles Summary ....................................................................................................... 3.99 3.3 Vulnerability Assessment ............................................................................................................. 3.100 3.3.1 Methodology ........................................................................................................................... 3.100 3.3.2 Community Assets .................................................................................................................. 3.101 3.3.3 Vulnerability by Hazard ........................................................................................................... 3.110 3.3.4 Future Land Use and Development ....................................................................................... 3.139 3.3.5 Summary of Key Issues .......................................................................................................... 3.141 4 Mitigation Strategy .............................................................................. 4.1 4.1 Goals ................................................................................................................................................... 4.1 4.2 Identification and Analysis of Mitigation Actions ........................................................................... 4.2 4.3 Implementation of Mitigation Actions .............................................................................................. 4.3 5 Plan Implementation and Maintenance ............................................. 5.1 5.1 Monitoring, Evaluating, and Updating the Plan .............................................................................. 5.1 5.1.1 Hazard Mitigation Planning Committee ...................................................................................... 5.1 5.1.2 Plan Maintenance Schedule ....................................................................................................... 5.2 5.1.3 Plan Maintenance Process ......................................................................................................... 5.2 5.2 Incorporation into Existing Planning Mechanisms ........................................................................ 5.3 5.3 Continued Public Involvement ........................................................................................................