Archer County and the Cities of Archer City Holliday Lakeside City Megargel Scotland Windthorst Mitigation Action Plan DEVELOPED BY THE ARCHER COUNTY MITIGATION PLANNING COMMITTEE June 5, 2013 1 Table of Contents EXECUTIVE SUMMARY ............................................................................................................................. 4 National Flood Insurance Program .............................................................................................................................. 4 Demographics ......................................................................................................................................................................... 6 SECTION I – ADOPTION…………………………………………………………………………………………18 SECTION II – AUTHORITY ................................................................................................................ 19 SECTION III – PURPOSE .................................................................................................................... 20 SECTION IV – ORGANIZING ASSETS .............................................................................................. 20 Diagram 1 illustrates the ACMPC structure ........................................................................................................... 21 Table 1 – Name & Jurisdiction Served by Individuals on the NRMAT-SC ..................................................22 Diagram 2 – Archer County Mitigation Plan Committee Hierarchy ............................................................24 Establishing an Open Public Process ..........................................................................................................................24 SECTION V – ASSESSING RISKS ....................................................................................................... 26 Floods ........................................................................................................................................................................................27 Windstorms ............................................................................................................................................................................28 Table 4 - Beaufort Wind Scale .......................................................................................................................................29 Table 5 - The Enhanced Fujita (EF) Scale ................................................................................................................32 Figure 1 – Map of Tornado Alley ..................................................................................................................................33 Wildfires ...................................................................................................................................................................................33 Drought ....................................................................................................................................................................................35 Table 7 - Palmer Drought Severity Index (PDSI) ..................................................................................................36 Extreme Heat .........................................................................................................................................................................36 Figure 2 – Heat Index Chart ............................................................................................................................................37 Hail .............................................................................................................................................................................................38 Table 8 - NWS/TORRO Hail Scale ................................................................................................................................39 Winter Storms. ..................................................................................................................................................................... 40 Dam Failures…………………………………………………………………………………………………………………………41 Table 9 – Summary of Hazard Profiles ......................................................................................................................46 Floods ........................................................................................................................................................................................51 Windstorms ............................................................................................................................................................................54 Tornadoes ...............................................................................................................................................................................56 Wildfire .................................................................................................................................................................................... 58 Drought ....................................................................................................................................................................................60 Extreme Heat .........................................................................................................................................................................62 Hail .............................................................................................................................................................................................64 Winter Storms .......................................................................................................................................................................66 Dam Failure…………………………………………………………………………………………………………………………..68 History of Infrastructure Damage by Hazard Agent .............................................................. 69 Floods ....................................................................................................................................................................................... 70 Windstorms ............................................................................................................................................................................89 Tornados............................................................................................................................................................................... 100 Wildfires ................................................................................................................................................................................ 101 Drought ................................................................................................................................................................................. 104 Extreme Heat ...................................................................................................................................................................... 107 Hail. ......................................................................................................................................................................................... 108 Winter Storms .................................................................................................................................................................... 130 Dam Failures……………………………………………………………………………………………………………………….133 2 Development Trends ..................................................................................................................... 133 Loss Estimates ................................................................................................................................. 139 Flooding ................................................................................................................................................................................ 139 Windstorms ......................................................................................................................................................................... 142 Tornadoes ............................................................................................................................................................................ 145 Wildfires ................................................................................................................................................................................ 149 Drought ................................................................................................................................................................................. 152 Extreme Heat ...................................................................................................................................................................... 154 Hail. ......................................................................................................................................................................................... 155 Winter Storms .................................................................................................................................................................... 157 Dam/Levee Failure………………………………………………………………………………………………………………159 Past Mitigation .....................................................................................................................................