with Sections 5 through 21, which include hazard descriptions and vulnerability assessments. Upon a review of the full range of natural hazards suggested under FEMA planning guidance, the City of Austin, including the Austin Independent School District (AISD), identified ten natural hazards, one technological hazard, and six human-caused hazards that are addressed in the 2016 Hazard Mitigation Plan Update (Plan or Plan Update). Of the hazards identified, eight natural hazards and one quasi-technological hazard (dam failure) were identified as significant, as shown in Table 4-1. The hazards were identified through input from Planning Team members, and a review of the current 2013 State of Texas Hazard Mitigation Plan Update (State Plan Update). Readily available online information from reputable sources such as federal and state agencies were also evaluated and utilized to supplement information as needed. In general, there are three main categories of hazards including atmospheric, hydrologic, and technological. Atmospheric hazards, are events or incidents associated with weather generated phenomenon. Atmospheric hazards that have been identified as significant for the City of Austin Planning area include extreme heat, extreme wind, tornado, hail, and winter storm (Table 4-1). Hydrologic hazards, are events or incidents associated with water related damage and account for over 75 percent of Federal disaster declarations in the United States. Hydrologic hazards identified as significant for the planning area include flood and drought. Technological hazards, refers to the origins of incidents that can arise from human activities, such as the construction and maintenance of dams. Technological hazards are distinct from natural hazards primarily because they originate from human activity. The risks presented by natural hazards may be increased or decreased as a result of human activity, however they are not inherently human-induced. Therefore, dam failure is classified as a quasi-technological hazard, and referred to as “technological , ” in Table 4-1 for purposes of description. For the Risk A ssessment, the wildfire hazard is considered “other , ” since a wildfire may be natural or human-caused, and is not considered atmospheric or hydrologic.