TANGIPAHOA PARISH Hazard Mitigation Update 2020 TANGIPAHOA PARISH HAZARD MITIGATION PLAN 1 - 1 Contents SECTION 1 INTRODUCTION ........................................................................................................ 1-4 Location and Hazard Risk ................................................................................................................ 1-5 Transportation ................................................................................................................................ 1-6 History ............................................................................................................................................ 1-6 Topography .................................................................................................................................... 1-7 Climate ........................................................................................................................................... 1-8 Economy ......................................................................................................................................... 1-8 Hazard Mitigation ........................................................................................................................... 1-9 General Strategy ........................................................................................................................... 1-11 2020 Plan Update .......................................................................................................................... 1-11 SECTION 2 HAZARD IDENTIFICATION AND PARISH-WIDE RISK ASSESSMENT ..................................... 2-1 Prevalent Hazards to the Community .............................................................................................. 2-1 Previous Occurrences ...................................................................................................................... 2-5 Probability of Future Hazard Events ................................................................................................. 2-9 Inventory of Assets for the Entire Parish ........................................................................................ 2-10 Essential Facilities of the Parish ..................................................................................................... 2-11 Future Development Trends .......................................................................................................... 2-20 Future Hazard Impacts .................................................................................................................. 2-21 Zoning and Land Use ..................................................................................................................... 2-26 Hazard Identification ..................................................................................................................... 2-30 Coastal Land Loss .......................................................................................................................... 2-30 Dam Failure .................................................................................................................................. 2-35 Drought ........................................................................................................................................ 2-39 Expansive Soils .............................................................................................................................. 2-41 Extreme Heat ................................................................................................................................ 2-45 Flooding ....................................................................................................................................... 2-47 Thunderstorms ............................................................................................................................. 2-79 High Winds ................................................................................................................................... 2-83 Lightning....................................................................................................................................... 2-84 Hailstorms .................................................................................................................................... 2-85 High Winds ................................................................................................................................... 2-91 Lightning....................................................................................................................................... 2-94 Tornadoes .................................................................................................................................... 2-97 Tropical Hurricanes ..................................................................................................................... 2-107 TANGIPAHOA PARISH HAZARD MITIGATION PLAN 1 - 2 Wildfire ...................................................................................................................................... 2-126 Winter Weather .......................................................................................................................... 2-132 Cyber Security ............................................................................................................................. 2-134 Bioterrorism ............................................................................................................................... 2-135 Pandemic .................................................................................................................................... 2-136 SECTION 3 CAPABILITY ASSESSMENT .............................................................................................. 3-1 Policies, Plans and Programs ........................................................................................................... 3-1 Building Codes, Permitting, Land Use Planning and Ordinances ........................................................ 3-3 Administration, Technical and Financial ........................................................................................... 3-3 Education and Outreach .................................................................................................................. 3-4 Flood Insurance and Community Rating System ............................................................................... 3-6 NFIP Worksheets ............................................................................................................................ 3-8 SECTION 4 MITIGATION STRATEGY ................................................................................................. 4-1 2020 Mitigation Actions and Update on Previous Plan Actions ......................................................... 4-3 Mitigation Actions for: Unincorporated Tangipahoa Parish ............................................................. 4-4 Mitigation Actions for: Town of Amite ......................................................................................... 4-12 Mitigation Actions for: City of Hammond ..................................................................................... 4-14 Mitigation Actions for: City of Ponchatoula .................................................................................. 4-16 Mitigation Actions for: Town of Kentwood ................................................................................... 4-18 Mitigation Actions for: Town of Independence ............................................................................. 4-20 Mitigation Actions for: Town of Roseland .................................................................................... 4-22 Mitigation Actions for: Village of Tangipahoa ............................................................................... 4-24 Mitigation Actions for: Village of Tickfaw ..................................................................................... 4-25 Mitigation Action Prioritization Process .......................................................................................... A-1 APPENDIX A: PLANNING PROCESS ................................................................................................. A-2 Purpose ......................................................................................................................................... A-2 Planning ........................................................................................................................................ A-3 Coordination .................................................................................................................................. A-3 Neighboring Community, Local and Regional Planning Process Involvement .................................... A-3 Program Integration / Participation ................................................................................................ A-4 APPENDIX B: PLAN MAINTENANCE ................................................................................................ B-1 Purpose ......................................................................................................................................... B-1 Monitoring, Evaluating, and Updating the Plan ............................................................................... B-1 Responsible Parties .......................................................................................................................