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Harris county flood map11/9/2023 About two-thirds of the inundation is outside of FEMA’s Special Flood Hazard Area, which is the so-called “100-year” floodplain, or area with a 1% or greater chance of flooding in any given year. In Table 1, the percentages of total flooded area illustrate the great intensity of flooding resulting from Harvey. Distribution of flood inundation in Harris County, Texas in different mapped flood zones. Reservoirs are overflowing, streams and rivers surging high over the surrounding floodplains, and highways and roads are now themselves rivers. The resulting inundation map shows the striking extent of flooding in Houston and provides context for the on-the-ground photos coming out of the area. Finally, we further compared the surface water extent with known pre-storm extents by flood-zone in order to determine flooding extent in each area in the portion of the county we assessed. We overlaid the resulting map on flood-zone boundaries from FEMA’s National Flood Hazard Layer and on other geographical data. In addition, this radar imagery is sensitive to standing water, making it an ideal tool for mapping the extent (but not depth) of flood water covering an area.Ī Sentinel-1 satellite passed over Houston on August 29, which we used to create a map that highlights water and flood inundation on the surface. The Sentinel-1 satellites carry radar sensors, which can scan the surface at night and through cloud cover. The Sentinel-1 system, which consists of two satellites, was launched by the European Space Agency. (2) Analyzed data from the US National Flood Insurance Program (NFIP) to look at the nature and pattern of flood exposure in Harris County, including Houston. 29, at the peak of flooding in many areas. (1) Processed radar data from the Sentinel-1A satellite from Aug. Our team in the Natural Hazards Research and Mitigation Group at the University of California, Davis conducted two sets of analyses to provide preliminary information on the pattern of flooding and to provide some context on historical flood damages in the Houston area. Even measurement of the flooding by visible-light based satellite has been impossible because the remnants of Hurricane Harvey have stalled over the Gulf Coast for the past week, dumping record precipitation and obscuring the skies from satellite view. The inundation is so widespread that detailed assessment has not yet been possible. At the present moment, little quantitative information is available about the extent of flooding or economic damages. The flooding now unfolding in the Houston area is a human and economic disaster likely to rank with Hurricanes Katrina and Sandy among the worst in US history. Located in Harris County, Texas, Houston is the 4 th most populous city in the US. On mobile device? Click here for a full screen experience.By Nicholas Pinter, Nicholas Santos, and Rui Hui INTERACTIVE: Want to know how many people in your neighborhood have reported flooding to the city? Explore the map below. There was also a cluster of complaints in the central-west area of Houston, near Spring Branch and the Spring Valley area. 23, days after Tropical Storm Imelda hit. One Kingwood resident reported flooding multiple times throughout the year, first in Jan. The Kingwood-area, which was among the hardest hit during Hurricane Harvey in 2017, had among the highest numbers of complaints, according City of Houston 311 flood data for the past 12 months. HOUSTON, Texas (KTRK) - From a cluster of residents in northeast Houston, to homeowners on the edges of the Harris County, there's been more than 1,600 flood complaints to the 311 hotline within the last year. WATCH: ABC13's Steven Romo walks you through the interactive map and the areas most affected by flooding.
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