Multi-Hazard Mitigation Plan: 03. Land Use and Development

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Chapter 3:Land Use and Development evacuation signage,Hawaii County is the only county in Hawaii that posts tsunami evacuation signage. • Flooding. Comparable risk of flash flooding to other counties due to small drainage basins with steep-walled amphitheater-shaped valleys; high sheetflow flooding risk due to relatively youthful geological development of defined drainageways, especially in the leeward areas; comparable risk to other counties to storm waves. Reservoir Dam Failures pose heightened threats to the Waimea area. • Coastal Erosion. Of lesser concern is sandy beach erosion due to the geologically youthful age of this island. Instead, sea cliff erosion is of greater concern to control building too closely to cliff edges. • Droughts and Wildfires. Higher risk to droughts and wildfires relative to other counties due to more extensive rural settlements that rely on water catchments, dominant agricultural industry that relies on rainfall, and expansive open land area and strong winds that make wildfires difficult to fight. In this chapter, each of the above hazards will be profiled in terms of: • Description of the hazard; • Recurrence and severity; • Identification of hazard areas; • State of the art assessment such as capabilities to predict, adequacy of warning systems, accuracy of identifying vulnerable areas, data needs. 3.5 Critical Facilities Maps showing locations of all critical facilities throughout Hawaii Count are included in Figure 3-2 through Figure 3-6. 3-6 Hawaii County Multi-Hazard Mitigation Plan