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<br />A-6 <br /> <br /> <br />designed for long term inundation with adequate access and utility services. Long term <br /> <br />flood areas include: <br /> <br /> <br />-- Barrier islands and beaches inundated by rising sea levels; <br /> <br /> <br />n Areas around lakes subject to long-term fluctuations of ground water; <br /> <br />-- Erosion-prone areas such as bluffs, where the land is destroyed; <br /> <br /> <br />-- Areas subject to subsidence caused by ground water or oil and gas withdrawals, <br /> <br /> <br />hydrocompaction or gradual solution of the underlying strata; and <br /> <br /> <br />-- Areas behind dikes and levees where high ground water levels may persist for <br /> <br /> <br />months or years. <br /> <br /> <br />Two or more of the special risk factors often occur in combination in high risk ar- <br /> <br /> <br />eas. For example, high velocity, debris and rapid rise of water combine to cause severe <br /> <br /> <br />damage on alluvial fans, in ice jam failures, mudflow and arcas subject to flooding by the <br /> <br /> <br />failure of dams or levees. Erosion or blockage of channels by sediment or debris is also <br /> <br />common in alluvial fan, mudflow and coastal areas. <br />