Sewerage and Water Board of New Orleans Local Hazard Mitigation Plan Sewerage & Water Board of New Orleans Local Hazard Mitigation Plan 2018 Prepared by Jason Higginbotham, CEM, LEM-P Page 1 of 216 Sewerage and Water Board of New Orleans Local Hazard Mitigation Plan This page intentionally left blank Page 2 of 216 Table of Contents 1. Table of Contents RECORD OF CHANGES .......................................................................................................................................... 10 1. INTRODUCTION ....................................................................................................................................... 12 1.1. WHAT IS A HAZARD MITIGATION PLAN? .................................................................................................. 13 1.2. BENEFITS OF MITIGATION PLANNING ...................................................................................................... 14 1.3. REGULATORY REQUIREMENTS ................................................................................................................. 16 2. ABOUT THE SEWERAGE AND WATER BOARD OF NEW ORLEANS ............................................................. 18 2.1. WATER SYSTEM ....................................................................................................................................... 19 2.2. SEWERAGE SYSTEM ................................................................................................................................. 23 2.2.1. SEWERAGE SYSTEM UPGRADES ............................................................................................................... 24 2.2.2. SEWERAGE SYSTEM FACTS ....................................................................................................................... 24 2.3. DRAINAGE SYSTEM .................................................................................................................................. 29 2.4. PURPOSE AND SCOPE .............................................................................................................................. 33 2.5. PARTICIPATING JURISDICTIONS ............................................................................................................... 33 3. PLANNING PROCESS ................................................................................................................................ 36 3.1. PLANNING PROCESS NARRATIVE ............................................................................................................. 36 3.2. PLANNING TEAM MEMBERS .................................................................................................................... 37 3.3. DESCRIPTION OF THE PLANNING PROCESS .............................................................................................. 38 3.4. COORDINATION WITH AGENCIES ............................................................................................................. 39 3.5. PLANNING MEETINGS .............................................................................................................................. 39 3.5.1. MEETING SCHEDULE ................................................................................................................................ 39 3.6. PUBLIC OUTREACH ................................................................................................................................... 40 3.6.1. PRE –ADOPTION PUBLIC MEETING ........................................................................................................... 40 3.7. ADOPTION PUBLIC MEETING ................................................................................................................... 40 3.8. INVOLVING KEY STAKEHOLDERS .............................................................................................................. 41 3.9. REVIEW AND INCORPORATION OF EXISTING INFORMATION ................................................................... 41 3.10. ADOPTION ............................................................................................................................................... 41 4. HAZARD VULNERABILITY ASSESSMENT .................................................................................................... 42 4.1. HAZARD IDENTIFICATION......................................................................................................................... 42 Page 3 of 216 4.1.1. IDENTIFIED HAZARDS ............................................................................................................................... 44 4.1.2. HAZARDS THE AFFECTED THE S&WB SINCE 2012 HAZARD MITIGATION PLAN ADOPTION ....................... 45 4.1.3. HAZARDS CONSIDERED, BUT ELIMINATED ............................................................................................... 45 4.1.4. SPECIAL NOTE FOR CYBER ATTACK, CIVIL UNREST AND TERRORISM HAZARDS ........................................ 50 4.1.5. CRITICAL INFRASTRUCTURE ..................................................................................................................... 50 4.2. INCLUDED HAZARDS ................................................................................................................................ 51 4.2.1. HAZARDS IDENTIFIED FOR THIS PLAN ...................................................................................................... 52 4.3. HAZARD PROFILES ................................................................................................................................... 53 4.3.1. FLOOD ..................................................................................................................................................... 54 4.3.2. HAILSTORM ............................................................................................................................................. 66 4.3.3. HAZARDOUS MATERIALS ......................................................................................................................... 69 4.3.4. HURRICANE / TROPICAL CYCLONE / COASTAL STORMS ........................................................................... 74 4.3.5. LEVEE FAILURE ......................................................................................................................................... 84 4.3.6. LIGHTNING/THUNDERSTORMS/SEVERE STORMS .................................................................................... 93 4.3.7. SALTWATER INTRUSION .......................................................................................................................... 98 4.3.8. SEVERE COLD / WINTER STORMS ........................................................................................................... 100 4.3.9. STORM SURGE ....................................................................................................................................... 104 4.3.10. SUBSIDENCE (EXPANSIVE SOILS) ............................................................................................................ 108 4.3.11. TORNADOES .......................................................................................................................................... 114 4.3.12. INFRASTRUCTURE FAILURE .................................................................................................................... 119 5. ASSESSING VULNERABILITY.................................................................................................................... 122 5.1. CRITICAL FACILITY ANALYSIS .................................................................................................................. 122 5.2. VULNERABILITY SUMMARY ................................................................................................................... 123 5.3. SYSTEMIC NOTES – VALUATION DATA ................................................................................................... 126 5.4. NFIP COMPLIANCE ................................................................................................................................. 128 5.5. LAND USE TRENDS ................................................................................................................................. 132 5.5.1. POPULATION ......................................................................................................................................... 132 5.5.2. LAND USE ............................................................................................................................................... 132 5.5.3. S&WB AND LAND USE TRENDS .............................................................................................................. 133 6. MITIGATION STRATEGY ......................................................................................................................... 134 6.1. GOALS AND OBJECTIVES ........................................................................................................................ 134 6.1.1. GOALS .................................................................................................................................................... 134 Page 4 of 216 6.1.2. OBJECTIVES ............................................................................................................................................ 135 6.2. MITIGATION ACTIONS ...........................................................................................................................