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For river systems, a 100-year flood is generally expressed as a flowrate. Based on the expected 100-year flood flow rate, the flood water level can be mapped as an area of inundation. The resulting floodplain map is referred to as the 100-year floodplain. Estimates of the 100-year flood flowrate and other streamflow statistics for any stream in ...
The term 100-year flood indicates that the area has a one-percent chance of flooding in any given year, not that a flood will occur every 100 years. [ 2 ] Such maps are used in town planning , in the insurance industry, and by individuals who want to avoid moving into a home at risk of flooding or to know how to protect their property.
In all, there are 655 structures within the 100-year floodplain. Most of the watershed, 71%, was developed before the 1991 Urban Watersheds Ordinance regulations. There are 54 roadways within the 100-year floodplain with 46 inundated by the 100-year, 41 inundated by the 25-year, 35 inundated by the 10-year, and 11 by the 2-year floods. [1] [note 2]
The state’s flood plan shows which Texans are most at risk of flooding and suggests billions of dollars more are needed for flood mitigation projects. Texas’ first-ever statewide flood plan ...
However, a June 2007 update floodplain map now indicated most of the facility was inside of 100-year floodplain, including the storage warehouses, backup generators and electrical transformers for commercial power. A smaller area of the facility was within the 500-year floodplain. [3] The organic peroxides are stored in nine storage buildings ...
This allowed for new development in the southern portion of the city, and removed an estimated 35,000 homes and 2,000 commercial structures from a 100-year floodplain. In 2016 the Houston Parks Board began a project to create trails and beautify areas along Sims Bayou.
The Grand River went above bankfull on the night of March 24, rising slowly for the next four days. It broke the previous high-water mark by over 60 cm (2.0 ft), and was considered a once in 100 year flood. Over one-half of the population on the west side of the river was inundated. On the east bank of the river, numerous factories went underwater.
The NFIP offers insurance to properties located within a flood-prone area, as defined by the Flood Insurance Rate Map (FIRM), which depicts various flood risks for a community. The FIRM typically focuses on the delineation of the 100-year flood inundation area, also known within the NFIP as the Special Flood Hazard Area.
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