![]() ![]() High-water mark data, along with flood flow information from USGS streamgages, were used to create 19 inundation maps to document the areal extent and depth of the flooding.įEMA requested time-perishable high-water marks, updated water-level records and Harvey inundation maps, which are key materials that will be used by state and local resource managers. Although parts of central Louisiana experienced Harvey related flooding, this report only documents the extent of flooding in southwest Louisiana along the Sabine River. USGS field crews collected 2,123 high-water marks in 22 counties in southeast Texas and three parishes across southwest Louisiana. In the immediate aftermath of Harvey, the USGS and FEMA initiated a study to evaluate the magnitude of flooding, determine the probability of future occurrence and map the extent of the flooding in Texas. Not only were rainfall totals exceptional during Hurricane Harvey, the area affected was also larger than previous events. history was during Tropical Storm Amelia in 1978, which left Texas Hill Country with 48 inches of rain. ![]() The second largest rainfall event recorded in continental U.S. ![]() Hurricane Harvey’s widespread 8-day rainfall, which started on August 25, 2017, exceeded 60 inches in some locations, which is about 15 inches more than average annual amounts of rainfall for eastern Texas and the Texas coast. ![]()
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