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 .............................................................................................................................. 1-12 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 .............................................................................................................. 2-21 Future Hazard Impacts ...................................................................................................................... 2-22 Zoning and Land Use ......................................................................................................................... 2-27 Hazard Identification ......................................................................................................................... 2-31 Coastal Land Loss .............................................................................................................................. 2-31 Dam Failure ...................................................................................................................................... 2-36 Drought ............................................................................................................................................ 2-40 Expansive Soils .................................................................................................................................. 2-42 Extreme Heat .................................................................................................................................... 2-46 Flooding ........................................................................................................................................... 2-48 Thunderstorms ................................................................................................................................. 2-82 High Winds ....................................................................................................................................... 2-84 Lightning........................................................................................................................................... 2-86 Hailstorms ........................................................................................................................................ 2-87 High Winds ....................................................................................................................................... 2-92 Lightning........................................................................................................................................... 2-95 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 ...................................................................................................................... 3-5 Flood Insurance and Community Rating System ................................................................................... 3-6 NFIP Worksheets ................................................................................................................................ 3-9 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 ............................................................................................. 4-14 Mitigation Actions for: City of Hammond ......................................................................................... 4-16 Mitigation Actions for: City of Ponchatoula ...................................................................................... 4-18 Mitigation Actions for: Town of Kentwood ....................................................................................... 4-21 Mitigation Actions for: Town of Independence ................................................................................. 4-23 Mitigation Actions for: Town of Roseland ........................................................................................ 4-25 Mitigation Actions for: Village of Tangipahoa ................................................................................... 4-27 Mitigation Actions for: Village of Tickfaw ......................................................................................... 4-28 Mitigation Action Prioritization Process ............................................................................................. 4-30 APPENDIX A: PLANNING PROCESS ...................................................................................................... A-1 Purpose .............................................................................................................................................. A-1 Planning ............................................................................................................................................. A-2 Coordination ....................................................................................................................................... A-2 Neighboring Community, Local and Regional Planning Process Involvement ......................................... A-2 Program Integration ............................................................................................................................ A-3 APPENDIX B: PLAN MAINTENANCE ..................................................................................................... B-1 Purpose .............................................................................................................................................