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<br /> <br />Table I, cont.: Rcducing Flood Losses in High Risk Arcas. <br /> <br />Hazard <br /> <br />Areas <br />Below <br />Unsafe or <br />Inadequate <br />Dams, <br />cont. <br /> <br />Coastal <br />Flooding <br />and <br />Erosion <br /> <br />Flash <br />Flooding <br /> <br />Special <br />Risk <br />Factors <br /> <br />* Structural <br />damage as <br />buildings are <br />undermined <br />* Suddenness <br />* Complete <br />destruction <br />of land <br />(in some <br />instances) <br /> <br />* Suddenness <br />* Velocity <br />* Debris <br />(often) <br /> <br />Area of <br />Occurrence <br /> <br />Barrier <br />islands, bluff <br />areas (Grcat <br />Lakes, West <br />Coast), bcaches <br />(Louisiana) <br /> <br />Principally <br />mountainous <br />regions in <br />valleys with <br />steep slopes; <br />also urbanizing <br />areas <br /> <br />B-3 <br /> <br />Management Options <br /> <br />* Require dam owners to prepare dam <br />inspection schedules and maintenance <br />plans; meet ycarly with dam owners <br />to review. <br />* Prepare or require dam owners to <br />prepare warning systems and <br />evacuation plans for areas below <br />unsafe or inadequate dams. <br />* Manage reservoirs to optimize flood <br />hazard reduction. <br /> <br />· Gather existing erosion studies and <br />historic data, prepare general or <br />specific maps based upon these or <br />other maps. <br />· Adopt sctback lines to prohibit <br />development in erosion prone land <br />and on protectivc land features such <br />as dunes, <br />* Adopt building performance <br />standards pertaining to depth and <br />specifications for pilings, groins, <br />seawalls, use of septic tanks, surface <br />drainage. <br />· Acquire undeveloped coastline and <br />relocate structures. <br />· Construct groins, seawalls, rebuild <br />beaches and dunes. <br /> <br />· Collect historical data on flash <br />flooding; use it and engineering <br />studies to map flash flood <br />inundation areas, <br />· Prohibit development and other <br />activities (e.g, campgrounds) in <br />high risk areas. <br />· Require that new development in <br />other arcas be constructed <br />consistent with water velocities and <br />potential debris. <br />· Install or require developers to <br />prepare warning systems; prepare <br />and implement evacuation plans. <br />