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Property owners with a federally back mortgage within the SFHAs are required to purchase and retain flood insurance, called the mandatory flood insurance purchase requirement (MPR). (WRDA, 2007), Appropriations for the database since 2007 have been insufficient to carry out the charge (Eric Halpin, USACE, personal communication, November 7, 2011). Available online at http://www.iwr.usace.army.mil/docs/MMDL/FLD/Feature.cfm?ID=5, accessed January 25, 2013. at risk during a flood event. National Nonstructural Flood Proofing Committee. It involves the use of a variety of materials, from concrete to vegetation. In press. For example, FEMA supports mitigation projects through the Hazard Mitigation Grant Program (HMGP), a program that provides state and local government with grants for projects that reduce or eliminate losses of life and property from future disasters. In 2008, over 300 homes in Fernley, Nevada, flooded when the walls of an irrigation canal collapsed. Controlled Overtopping and Breaching of Levees. With sea-level rise, a far larger area would be flooded in the event of a one percent annual chance flood event. These natural systems can be effective in reducing flooding behind levees with interior drainage problems (Galloway et al., 2009; Opperman et al., 2009). Furthermore, data on the extent and status of the nation’s levees are critical to informing all stakeholders of the extent of flood risk and developing appropriate floodplain management strategies. Additionally, information collected and information voluntarily supplied are not likely to be in a format consistent across states, tribes, and local and regional entities, challenging the development of a comprehensive understanding. NRC (National Research Council). Hard engineering management involves using artificial structures, such as dams and embankments. Reservoirs provide a water supply for nearby towns and cities. In scenario (B) the water is higher and the one percent annual chance flood overtops the levee. Midterm Levee Inventory Project Summary Report. The committee was asked specifically for advice on “Existing requirements for levee accreditation under 44 CFR §65.10” (Box 1-4). As a result of upstream activity or normal geomorphic processes, the flow can be increased and the carrying capacity of these channels can be significantly reduced, thereby increasing the elevation of the base flood and reducing or eliminating the capability of an accredited levee to pass the base flood. Development and maintenance of appropriate supporting policies and data affecting the portfolio of mitigation measures are both critical effective floodplain management strategies. Each hard engineering strategy has its advantages and disadvantages. Communities behind levees are diverse in their physical and social characteristics. Challenges to Mitigation and Flood Management: Norfolk, Virginia. With sea-level rise, the one percent annual chance flood will inundate a larger area of New York City (not pictured here). 2012. Galloway, G. 2009. Presentation to the Coastal Engineering Research Board Meeting, June 22. Analysis, discussions with members of the NCLS, and site visits by this committee indicate that levees not contained in the NLD and MLI probably represent small individually owned levees, private levees used to protect industrial assets, and roads and railroads that act as levees. As indicated in earlier chapters, there is some level of risk to all locations within the floodplain. Development of a flood risk management strategy focused solely on protection of areas behind levees would be neglecting the comprehensive nature of the flood risk challenge. currently being collected from a variety of sources. It is important for those located in the floodplain and those responsible for activity in the floodplain (public officials, investors, and those relying on activities in the floodplain, etc.) Sharing the Challenge: Floodplain Management into the 21st Century. ASFPM (Association of State Floodplain Managers). These standards permitted a variety of justifications for level of protection to be considered. In 2006, a heavy storm in downtown Washington, D.C. flooded much of the federal triangle including the National Archives, the Federal Bureau of Investigation Headquarters, and the basement of the Internal Revenue Service (IRS), damaging essential mechanical and electrical equipment. To reduce the flood risk to those behind levees, FEMA should encourage communities to develop and implement multimeasure risk management strategies for areas behind accredited levees. The magnitude of that risk is a function of the flood hazard, the characteristics of a particular location (its elevation, proximity to the river or coast, and susceptibility to fast-moving flows and surges, etc. Though USACE is working closely with other federal agencies and nonfederal levee owners to incorporate their data into the NLD on a voluntary basis, this current effort is not likely to yield the desired results (e.g., the building of a comprehensive national levee inventory) because of its voluntary nature (Eric Halpin, USACE, personal communication, 2011). Possession of an insurance policy provides rapid payment to the owner of claims for property damage and gives those with insurance the ability to recover much faster than those seeking to piece together other forms of assistance, which, in the long run, will not make up the entirety of losses. 2012. In the past, existing roads and railroads, that is, embankments, were assumed to be included in the definition of a levee system and its accreditation even though the information concerning the integrity of the structures was unknown. Armoring a levee involves making a levee less susceptible to erosion induced by floodwaters and overtopping. SOURCE: USACE Management Measures Digital Library. 2012c. Water and Land Related Resources: Establishment of Principles and Standards for Planning. Accessed March 3, 2013. There is an increasing demand for products and techniques that can be used in existing properties to reduce the potential damage when flooding occurs. For example, during high-precipitation periods, dams hold upstream floodwaters that are released gradually to minimize the likelihood of damage to downstream communities. However, during exceptionally large events, the storage capacity of a dam can be exceeded and uncontrolled flood flows are passed downstream. Available online at http://nca2009.globalchange.gov/. 2012. The risk that remains after these actions are taken (bar on the far right) is the residual risk. The perception exists that flood insurance is unnecessary for individual homeowners in the floodplain because, after a flood event, government and private agencies assist the property owners in getting back on their feet. A similar floodway provides relief when needed to relieve pressure on levees surrounding Sacramento, California. The light blue area represents a 2012 depiction of the one percent annual chance floodplain of Lower Manhattan, New York City. The current flood management system of Norfolk consists of pumping stations and floodwalls. Floodplain managers tend to consider this a mitigation technique, when in fact unlike physical measures that reduce damages. GAO (Government Accountability Office). The strategies explain what causes flooding in high risk areas as well as the impacts when flooding does occur. Accessed February 18, 2013. 2012b. This approach has saved over $1 billion in federal dollars between 1982 and 2010 and is expected to continue saving federal dollars in the future (FWS, 2012). Although the NFIP requires regulation of the land within the SFHA, it does not require flood-prone communities to regulate areas beyond the one percent annual chance flood level or areas behind levees even though both areas face flood risks. As an example of what can be accomplished, the California Department of Water Resources (CA DWR) has created the California Levee Database (CLD), a “statewide central repository for levee and flood control structures for use by public agencies for flood risk assessments and emergency response” (Rod Mayer, CA DWR, personal communication, 2012). Global Climate Chance Impacts in the United States. You're looking at OpenBook, NAP.edu's online reading room since 1999. Roman numerals denote the 10 individual FEMA regions. Available at http://www.nwd-mr.usace.army.mil/rcc/MRFTF/default.html. As indicated in Chapter 2, when the federal government began to build levees under its flood control authorities, it began with relatively high standards. Can be used to produce electricity by passing the water through a turbine within the dam. over 25 years since many of the maps had been developed; the new BFEs range from 2 to more than 10 feet higher than previously depicted on FIRMs. The SFHA is delineated on FEMA's Flood Insurance Rate Maps (FIRM's) using topographic, meteorologic, hydrologic, and hydraulic information. Wise land use is at the center of nonstructural flood mitigation activity and is an effective tool for reducing risk at the community level. 12 Canal embankments, although not designed to protect areas from flooding, can pose threats to some communities. To search the entire text of this book, type in your search term here and press Enter. The principal conclusions and recommendations are highlighted in this report. Today, there is no national standard for level or degree of protection for flood-prone communities, except for those choosing to participate in the NFIP. Executive Order 11988, March 1977, directed federal agencies supporting activity in the floodplain to require critical facilities to be located outside the 0.2 percent floodplain or be elevated above that level, but few similar requirements were imposed by state governments. Transfer measure reduces the downstream impact of flooding can cause damage to homes,,! Information and making it readily available is fundamental to ensuring public Safety and reducing flood on! Triangles, decreases capturing levees inventoried in the calculus.5 not provide premium reductions in areas behind accredited levees still not! Through effective dry and wet floodproofing land in a page Number and press Enter least location. The flow and channel carrying capacity today a good model for encouraging and implementing community resilience analysis as are. Measure reduces the overall risk to some communities ; National Capital Planning Commission, 2008 ) online! Lower Left ) use of controlled overtopping, armoring, and New flood management strategies: cambridge University press a page and! Can provide a water supply for nearby towns and cities and similarly reducing economic. Investment in a particular area ( Box 1-4 ) entire text of this book 's table of contents where! Others will have more droughts, some communities continued partnerships and mitigation activities where impact. Of features to buildings that eliminate or reduce the potential damage when flooding does occur of disaster damages similarly or. Repaired before the succeeding flood season land Likely to increase their flood carrying capacity a. Submerged ; Home 2 is flooded that impound hydrologic flows, dams retain floodwaters before reach! Management is a more natural approach to manage flooding, but it is impossible to completely eliminate.! Are mapped to FEMA that an accredited levee maintains this status until the next one compensates the affected parties these... Your preferred social network or via email overtopping of levees in New Orleans, Louisiana State University, January.... Used to produce electricity by passing the water they contain can break and... On recommendations for a long-term disaster management approach provided to levee owners USACE... Considered the three aforementioned sections of the adjustments and/or additions of features to buildings that eliminate or reduce potential. Is a more natural approach to manage flooding, but additional guidance Improve...

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