IBERVILLE PARISH HAZARD MITIGATION PLAN I
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IBERVILLE PARISH HAZARD MITIGATION PLAN i IBERVILLE PARISH HAZARD MITIGATION PLAN ii ***This Page Left Intentionally Blank*** IBERVILLE PARISH HAZARD MITIGATION PLAN iii IBERVILLE PARISH HAZARD MITIGATION PLAN UPDATE Prepared for: Iberville Parish Prepared by: Stephenson Disaster Management Institute Ms. Lauren Stevens Mr. Chris Rippetoe Mr. Joseph Harris Mr. Brant Mitchell Dr. Carol J. Friedland, P.E., Ph.D., C.F.M. Mr. Stuart Nolan Louisiana State University - Business Education Complex Baton Rouge, LA 70803 November 14, 2016 IBERVILLE PARISH HAZARD MITIGATION PLAN iv ***This Page Left Intentionally Blank*** IBERVILLE PARISH HAZARD MITIGATION PLAN v ACKNOWLEDGMENTS This 2016 Iberville Parish Hazard Mitigation Plan Update was coordinated by the Iberville Parish Hazard Mitigation Plan Update Steering Committee, in collaboration with the participating jurisdictions as well as community stakeholders and the general public. The participating jurisdictions are made up of the following communities: Unincorporated Iberville Parish Village of Grosse Tete Town of Maringouin City of Plaquemine Village of Rosedale City of St. Gabriel Town of White Castle Special thanks is directed to all of those who assisted in contributing feedback and expertise on this document, especially the Iberville Parish Office of Homeland Security and Emergency Management. These combined efforts have made this project possible. The Iberville Parish Steering Committee consists of the following individuals, who are credited in the creation of this document: Name Title Agency Laurie Doiron Director Iberville OHSEP/911 J. "Mitchell" Ourso, Jr. Parish President Iberville Parish Council Mark Migliacio Director Iberville Parish Public Works Michael Chauffe Mayor Village of Grosse Tete Demi Vorise Mayor Town of Maringouin Mary S. Gulotta Mayor City of Plaquemine Lawrence Badeaux Mayor Village of Rosedale Lionel Johnson, Jr. Mayor City of St. Gabriel Gerald Jemarr Williams Mayor Town of White Castle James "Jimbo" Cox Major Iberville Sheriff Office The 2016 Iberville Parish Hazard Mitigation Plan Update was written by the Stephenson Disaster Management Institute, Louisiana State University. Further comments should be directed to the Iberville Parish Office of Homeland Security and Emergency Preparedness: 58030 Meriam St., Plaquemine, LA, 70764. IBERVILLE PARISH HAZARD MITIGATION PLAN vi Contents 1. Introduction ............................................................................................................................................ 1-1 Location, Demography, and Economy........................................................................................................ 1-2 Location .................................................................................................................................................. 1-2 Economy ................................................................................................................................................. 1-3 Hazard Mitigation ....................................................................................................................................... 1-4 General Strategy ......................................................................................................................................... 1-6 2016 Plan Update ....................................................................................................................................... 1-6 2. Hazard Identification and Parish-Wide Risk Assessment ....................................................................... 2-1 Prevalent Hazards to the Community ........................................................................................................ 2-1 Previous Occurrences ................................................................................................................................. 2-2 Probability of Future Hazard Events ........................................................................................................... 2-3 Inventory of Assets for the Entire Parish .................................................................................................... 2-4 Essential Facilities of the Parish.................................................................................................................. 2-6 Future Development Trends .................................................................................................................... 2-11 Future Hazard Impacts ............................................................................................................................. 2-13 Land Use ................................................................................................................................................... 2-13 Hazard Identification ................................................................................................................................ 2-15 Coastal Land Loss/Subsidence .............................................................................................................. 2-15 Flooding ................................................................................................................................................ 2-19 Sinkholes ............................................................................................................................................... 2-39 Thunderstorms ..................................................................................................................................... 2-44 Tornadoes ............................................................................................................................................. 2-57 Tropical Cyclones .................................................................................................................................. 2-64 Levee Failure ......................................................................................................................................... 2-83 3. Capability Assessment ............................................................................................................................ 3-1 Policies, Plans, and Programs ..................................................................................................................... 3-1 Building Codes, Permitting, Land Use Planning and Ordinances ........................................................... 3-2 Administration, Technical, and Financial.................................................................................................... 3-3 Education and Outreach ............................................................................................................................. 3-4 Flood Insurance and Community Rating System ........................................................................................ 3-5 NFIP Worksheets ........................................................................................................................................ 3-8 4. Mitigation Strategy ................................................................................................................................. 4-1 Introduction ................................................................................................................................................ 4-1 Goals ........................................................................................................................................................... 4-1 2016 Mitigation Actions and Update on Previous Plan Actions ................................................................. 4-2 IBERVILLE PARISH HAZARD MITIGATION PLAN vii Iberville 2011 Hazard Mitigation Action Update .................................................................................... 4-3 Unincorporated Iberville New Mitigation Actions ............................................................................... 4-23 Village of Grosse Tete New Mitigation Actions .................................................................................... 4-25 Town of Maringouin New Mitigation Actions ...................................................................................... 4-27 City of Plaquemine New Mitigation Actions ......................................................................................... 4-29 Village of Rosedale New Mitigation Actions ........................................................................................ 4-31 City of St. Gabriel New Mitigation Actions ........................................................................................... 4-33 Town of White Castle New Mitigation Actions .................................................................................... 4-35 Action Prioritization .................................................................................................................................. 4-37 Appendix A: Planning Process ........................................................................................................................ A-1 Purpose ....................................................................................................................................................... A-1 The Iberville Parish Hazard Mitigation Plan Update .................................................................................. A-1 Planning .....................................................................................................................................................