Risk MAP builds on the flood hazard data and maps that were produced as part of the Flood Map Modernization Program. In 2009, FEMA transitioned to the Risk Mapping, Assessment, and Planning (Risk MAP) program. In recognition of the connection between flood mitigation, risk reduction, and reliable flood maps, the President and the US Congress provided substantial funding for Flood Map Modernization starting in Fiscal Year 2002. In 2002, South Carolina alone had over 75 communities that had not been mapped. Through the CTP program the SCDNR works with FEMA to update flood hazard information for all of the State's 46 counties. The State of South Carolina is committed to reducing flood risks within the State. Understanding the need for current, accurate flood maps the South Carolina Department of Natural Resources became a Cooperating Technical Partner (CTP) with the Federal Emergency Management Agency (FEMA) in 1999. Throughout the years, many of these maps had become outdated, and significant areas of the country remain unmapped. The Federal Emergency Management Agency (FEMA) flood hazard maps are one of the essential tools for flood hazard mitigation in the United States. The flood level or inundation depth will then be 8m at the river, and zero at the 8-m HAND contour.The citizens of the State of South Carolina face significant hazards from floods and hurricanes, and more than $7 billion in damages has occurred from flood and hurricane events in the last 25 years. For example, a 8-m stage flood indicates that when the water increases by eight meters in the river channel, the water will inundate until the 8-m HAND contour. For each of these hypothetical floods the HAND contour represents the area that would be flooded if the stage in the river rises to that level. To illustrate this, the figure below represents uniform hypothetical floods from 1m to 8m stage height in a region of the Philippines. The depth of the flood is the arithmetic inverse of the HAND height. The HAND contour map can simultaneously show the extent of inundation and the inundation depth. This gives information about the potential people and assets at risk. The different HAND contours represent hypothetical flood extents for different water levels, and give an impression of the floodplain at risk. These maps, which represent the potential extent of inundation, follow a simple static HAND approach as described in Nobre et al. The end user can then decide which ‘scenario’ or inundation map is most relevant for the current flood. Maps of fluvial flooding are created based on Height Above Nearest Drainage (HAND) contours as a first estimate flood map. This method should be applied on a subnational to regioanl scale and is maily usefull if detailed locaiton information of tweets is lacking. With multiple cities along the same river we could give an estimate of the inundation map which corresponds best with the available flood information from Twitter. These maps give information about the potential people and assets at risk. a ‘noise’ threshold of number of flood related social media messages at a certain area is exceeded, possible inundation maps are created for that location. When an event is detected in the global twitter feed by FloodTags, i.e.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |