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<br />Rule 4. Definitions: Floodplain Rule Terms Defined. The following definitions are applicable to <br />these floodplain Designation and Approval Rules. . <br /> <br />Term <br />Alluvial Fans <br /> <br />Definition <br />A fan-shaped sediment deposit formed by a stream that flows from a steep <br />mountain valley or gorge onto a plain or the junction of a tributary stream <br />with the main stream. Alluvial fans contain active stream channels and <br />boulder bars, and recently abandoned charmels. Alluvial fans are <br />predominantly formed by alluvial deposits and are modified by infrequent <br />sheet flood, channel avulsions and other stream processes. <br /> <br />Approximate <br />floodplain <br />information <br /> <br />Floodplain information that significantly reduces the level of detail for <br />topographic mapping or hydraulic calculations to arrive at floodplain <br />delineations without a comparison of water surface profiles with a <br />topographic map of compatible accuracy. The hydrology shall be <br />compatible with detailed floodplain information. <br /> <br />Base Flood <br /> <br />Synonymous with lOO-year flood and it means a flood having a one <br />percent chance of being equaled or exceeded in any given year. <br /> <br />Base Flood Elevation <br />(BFE) <br /> <br />The elevation shown on a FEMA Flood Insurance Rate Map for Zones <br />AE, AH, Al-A30, AR, ARIA, ARlAE, ARlAl-A30, ARlAH, AR/AO, VI- <br />V30, and VE that indicates the water surface elevation resulting from a <br />flood that has a one percent chance of equaling or exceeding that level in <br />any gIven year. <br /> <br />. <br /> <br />Basin <br /> <br />The total land surface area from which precipitation is carried away by a <br />stream or system of streams under the force of gravity and discharged <br />through one or more outlets. <br /> <br />Channel <br /> <br />Low lying area where water flows regularly or intermittently with a <br />perceptible current between observable banks, although the location of <br />banks may vary under different conditions. <br /> <br />Channelization <br /> <br />The artificial creation, enlargement or realignment of a stream charmel. <br /> <br />Code of Federal <br />Regulations <br /> <br />(CFR) is the codification ofthe general and permanent rules published in <br />the Federal Register by the executive departments and agencies of the <br />Federal Government. It is divided into 50 titles that represent broad areas <br />subject to Federal regulation. FEMA regulations fall under 44 CFR. <br /> <br />. <br /> <br />4 <br /> <br />DRAFT <br />