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Flood Hazard Areas (Flood Zones) from FEMA's National Flood Hazard Layer (NFHL).
Downloaded 6/2/2022 by Harris County Engineering Department GIS from FEMA NFHL Status Page.
(http://www.floodmaps.fema.gov/NFHL/status.shtml).
For analysis of Hurricane Harvey, use FEMA release from 8/28/2017
For analysis of Tropical Storm Imelda, use FEMA release from 6/17/2019