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The number of people reported missing in Kerr County, Texas, as a result of last week’s flash floods continues to soar. Authorities say search teams combing through the debris and destruction there are looking for more than 160 people who disappeared in the raging waters.Kerr County is nestled in the heart of the Texas Hill Country, a region that has seen some devastating flash floods. The Hill Country region, also known as "Flash Flood Alley," has steep hills and semiarid soil that allow for rapid runoff during intense rainfall events.Nevertheless, the county's lowlands are lined with numerous vacation spots and campsites along the Guadalupe River.The Federal Emergency Management Agency maintains a geospatial database that contains current, effective flood hazard data. The National Flood Hazard Layer shows the level of flood risk and the type of flooding in a certain area.Flood zones are classified based on their level of flood risk as low, moderate or high. These flood zones are designated with the letters "A," "AE," for high-risk areas and "X" for moderate to low flood risk areas.High-risk flood zones, which are also referred to as the base flood or 100-year flood, are areas where there is a 1% chance of being flooded every year. Flood zone A uses approximate methods to determine high-risk zones, while flood zone AE has specific base flood elevations determined through detailed studies.The Hearst Television Data team used FEMA's National Flood Hazard Layer to identify high-risk flood zones in relation to last week's flash flood. The mapping highlights that the three summer camps affected by the flash flood were within special flood hazard areas.Camp Waldemar is located within flood zone A and near the North Fork Guadalupe River. Meanwhile, Camp La Junta is located in areas within flood zones A and AE along the junction of the North and South forks of the Guadalupe River.Instagram posts show that all campers and staff from both campsites were safe.Camp Mystic, on the other hand, lost at least 27 campers and counselors to the Texas flash flood. The century-old Christian summer camp for girls had two campsites, one along the Guadalupe River and another next to Cypress Creek. Both campsites were surrounded by high-risk flood zones A and AE. Officials said five campers and one counselor have still not been found. The ongoing search for flood victims stretched into its seventh day even as the Texas Hill Country prepares for more rain.