![]() ![]() However, current standards require proactive flood mitigation in order to permanently eliminate or reduce the long-term risk to human life and property and the negative impacts on natural and cultural resources that can be caused by hazards historically associated with land development and urbanization. Urbanization increases runoff two to six times over what would occur on natural terrain. As land is converted from fields or woodlands to roads, parking lots and other types of impervious cover, it loses its ability to absorb rainfall. This increases flood potential in two ways: it reduces the stream's capacity to contain flows and increases flow rates downstream. The built up environment creates localized flooding problems outside natural floodplains by altering or confining drainage channels. Human activities encroach upon floodplains, affecting the distribution and timing of drainage and potentially increasing flood problems. For more information regarding NFIP, click here: In exchange, the NFIP makes federally backed flood insurance available to homeowners, renters and business owners in these communities. Nearly 20,000 communities across the United States and its territories participate in the NFIP by adopting and enforcing floodplain management ordinances to reduce future flood damage. In 1968, Congress created the National Flood Insurance Program (NFIP) in response to the rising cost of taxpayer funded disaster relief for flood victims and the increasing amount of damage caused by floods. What is the National Flood Insurance Program (NFIP)? More details regarding dFIRM are available at: It also has National Flood Insurance Program (NFIP) community information, map panel information, cross section and hydraulic structure information, Coastal Barrier Resource System information (if applicable) and base map information like road, stream and public land survey data. The Standard dFIRM Database is designed to provide the user with the ability to determine the flood zone, base flood elevation and the floodway status for a particular location. The Standard dFIRM Database is a digital version of the FEMA flood insurance rate map that is designed for use with digital mapping and analysis software. What is a digital Flood Insurance Rate Map (dFIRM)? Not a determination of where and how frequently actual flood damage will occurįor more information on 100-year floodplains, click here:.Limited to the “best information at the time”. ![]() All this information goes into a formula/statistical model that generates elevations on tracts of land throughout a watershed that have a “1 in 100 chance (1 percent) of occurrence of flooding in any given year or a ‘return period’ of once every 100 years.”ġ00-year floodplains are not arbitrary but they are: Both the federal government and the private sector assist the insurance industry in gathering scientific measurements that are then used to generate a "best guess" of stream flow peaks over a time. The 100-year floodplain is based on a statistical probability needed by the insurance industry as a standard upon which to base policies. Minimize damage to public facilities and utilities. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |