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<br />3 <br /> <br />programs, land disposals and land use .planning. Federal Agencies <br />having regulatory authority over land or property should evaluate the <br />flood hazard in accordance with these guidelines and issue rules and <br />regulations for development and use of the area. <br /> <br />, <br />'j, <br /> <br />Where regulatory authority is vested in State or local agencies, with <br />regard to Federally financed or supported development, appropriate <br />valuations of flood hazards ma y be accomplished by the user agency <br />in conformance to these guidelines and procedures developed by the <br />executive agencies for their programs. <br /> <br />FLOOD HAZARD AND ITS EVALUA TION <br /> <br />Throughout this.docUInent, flood hazard is used as a general term <br />meaning the risk to life or damage to property from overflows of the <br />river or stream channel; extraordinary waves or tideS occurring <br />on lake, estuary, or ocean shores; flood flows in intermittent or <br />normally dry streams; floods on tributary streams; floods caused by <br />accUInulated debris or ice in rivers; or other similar events. <br /> <br />Floodplains <br /> <br />Three general types of land area where flood hazard is common are <br />riverine, coastal, and debris cone areas. At some locations there <br />may be a combination of such areas, in which cases the hazard from <br />all sources must be considered. <br /> <br />Riverine Floodplains are valley areas adjacent to a stream or river <br />(see figure 1). A flood on such an area is due to a rainstorm or <br />snowmelt runoff that exceeds the carrying capacity of the low flow or <br />main channel of the valley, or which is due to channel obstructions <br />that cause even relatively small flows to overflow channel banks. <br />Riverine areas common to both a tributary and a main channel may <br />be flooded by either the tributary or the main channel or by both <br />simultaneously. <br /> <br />C1C1 <br /><;"0 <br /> <br />Coastal Floodplains are areas bordering a lake, estuary, ocean, or <br />similar body of standing water (see figure 2). Floods are due to <br />landward flows caused by excessively high tides, waves from high winds, <br />