St. Mary's County Multi-Jurisdictional Hazard Mitigation Plan

List of Figures and Tables
SMC Multi-jurisdictional Hazard Mitigation Plan
List of Figures
FIGURE 2.1 – MAP SHOWING SOUTHERN MARYLAND...............................................................................3
FIGURE 2.2 – MARYLAND WATERSHEDS..................................................................................................3
FIGURE 4.1 – RISK ASSESSMENT STEPS ............................................................................................... 21
FIGURE 4.2 – FEMA’S DESIGN WIND SPEED FOR COMMUNITY SHELTERS .............................................. 27
FIGURE 4.3 – HISTORY OF MARYLAND TORNADOES ............................................................................... 27
FIGURE 4.4 – WIND ZONES IN THE UNITED STATES................................................................................ 30
FIGURE 4.5 – HURRICANES WITHIN 65 MILES OF ST. MARY’S COUNTY SINCE 1886 ................................ 30
FIGURE 4.6 – FIRE THREAT POTENTIAL IN MARYLAND COUNTIES............................................................ 42
FIGURE 4.7 – FORESTED AREAS IN MARYLAND COUNTIES ..................................................................... 42
FIGURE 4.8 – LANDSLIDE INCIDENCE/SUSCEPTIBILITY FOR THE NORTHEASTERN UNITED STATES............. 45
FIGURE 4.9 – LANDSLIDE SUBSIDENCE IN THE UNITED STATES ............................................................... 46
List of Tables
TABLE 3.1 – ST. MARY’S COUNTY HAZARD MITIGATION PLANNING COMMITTEE.......................................7
TABLE 3.1.A - PROJECTS FROM THE 2005 ST. MARY’S COUNTY HAZARD MITIGATION PLAN…….………….7
TABLE 3.2 – INTERAGENCY COORDINATION ......................................................................................... 10
TABLE 4.1 – TORNADO DAMAGE SCALE............................................................................................... 24
TABLE 4.3 – TORNADO HISTORY ......................................................................................................... 25
TABLE 4.4 – SAFFIR-SAMPSON SCALE AND TYPICAL DAMAGES ............................................................ 28
TABLE 4.5 – WINTER WEATHER HISTORY ............................................................................................ 32
TABLE 4.6 – HEAT DANGER CATEGORIES ............................................................................................ 33
TABLE 4.7 – FLOODING VS. FLASH FLOODS – CAUSES ......................................................................... 34
TABLE 4.8 – FLOOD PROBABILITY TERMS ............................................................................................ 35
TABLE 4.9 – DROUGHT HISTORY ......................................................................................................... 38
TABLE 4.10 – FIRE DANGER RATING DESCRIPTIONS .............................................................................. 41
TABLE 4.11 – HISTORY OF FIRES IN ST. MARY’S COUNTY....................................................................... 41
TABLE 4.12 – EARTHQUAKE MAGNITUDE AND INTENSITY SCALES ........................................................... 43
TABLE 4.13 – MODIFIED MERCALLI INTENSITY SCALE AND PEAK GROUND ACCELERATION COMPARISON.. 43
TABLE 4.14 – SUMMARY OF HAZARD EVENTS 1950 – 2003.................................................................... 47
TABLE 4.15 – FREQUENCY OF OCCURRENCE......................................................................................... 48
TABLE 4.16 – HAZARD PRIORITY........................................................................................................... 48
TABLE 5.1 – POPULATION CHANGE ..................................................................................................... 49
TABLE 5.2 – BUILDING COUNT AND EXPOSURE BY USE ........................................................................ 51
TABLE 5.3 – BUILDING COUNT AND EXPOSURE BY TYPE.......................................................................
TABLE 5.4 – CRITICAL FACILITIES COUNT AND EXPOSURE.................................................................... 51
TABLE 5.5 – AGE OF HOUSING UNITS (BUILT BEFORE 1940 .................................................................. 53
vll