Climate & Health – Flood Vulnerability
This indicator reports the estimated population within estimated 100-year flood hazard areas per county.
Source
Source Description
The Environmental Protection Agency or EPA is an agency of the US federal government with purpose of protecting human health and the environment. It ensures that environmental protection is an integral consideration in US policies concerning natural resources, human health, economic growth, energy, transportation, agriculture, industry, and international trade
Methodology
The LandScan USA Population Database provides estimated population counts at 3 arc-second (~90m) resolution for nighttime and daytime, for the continental United States, Hawaii, Alaska, and the five permanently inhabited USA territories. Residents, prisoners, workers, students, shoppers, and stay-at-home populations are modeled. These are baseline population estimates, which do not include transitory populations such as business travelers and tourists. The EPA EnviroAtlas dataset provides an estimate of the 100-year floodplain for the conterminous United States at 30-meter resolution to fill the gaps in the FIRM. The model hit rate for the CONUS was 0.79 compared to the FIRM, indicating that the model captured 79% of the 100-year floodplain identified by FEMA. The intersection of the population raster and flood hazard raster was summarized for each county within the continental U.S to estimate the population living within flood hazard areas.
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