Flood insurance is the specific insurance coverage issued against property loss from flooding. To determine risk factors for specific properties, insurers will often refer to topographical maps that denote lowlands, floodplains and other areas that are susceptible to flooding. In the United States Nationwide, only 20 percent of American homes at risk for floods are covered by flood insurance. Most private insurers do not insure against the peril of flood due to the prevalence of adverse selection, which is the purchase of insurance by persons most affected by the specific peril of flood. In traditional insurance, insurers use the economic law of large numbers to charge a relatively small fee to large numbers of people in order to pay the claims of the small numbers of claimants who have suffered a loss. Some insurers provide privately written primary flood insurance for high-value residential properties, and for low-value and high value buildings, including through The Natural Catastrophe Insurance Program. However, claimants far outnumber the availability of flood insurance, since most private insurers view the probability of generating a profit from related premium payments to be remote. In certain flood-prone areas, the federal government requires flood insurance to secure mortgage loans backed by federal agencies such as the FHA and VA. However, the program has never worked as insurance, because of adverse selection. It has never priced people out of living in very risky areas by charging an appropriate premium, instead, too few places are included in the must-insure category, and premiums are artificially low." The lack of flood insurance can be detrimental to many homeowners who may discover only after the damage has been done that their standard insurance policies do not cover flooding. Flooding is defined by the Federal Emergency Management Agency (FEMA) as a general and temporary condition of partial or complete inundation of two or more acres of normally dry land area or two or more properties (at least one of which is your property) from: Overflow of inland waters, unusual and rapid accumulation or runoff of surface waters from any source, and mudflows. This can be brought on by landslides, hurricanes, earthquakes, or other natural disasters that influence flooding, but while a homeowner may, for example, have earthquake coverage, that coverage may not cover floods as a result of earthquakes. Very few insurers in the US provide private market flood insurance coverage due to the hazard of