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Agenda - 11-27-1995 - C-1-b
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Agenda - 11-27-1995 - C-1-b
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1/12/2015 4:06:22 PM
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BOCC
Date
11/27/1995
Meeting Type
Public Hearing
Document Type
Agenda
Agenda Item
C-1-b
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Minutes - 19951127
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\Board of County Commissioners\Minutes - Approved\1990's\1995
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03i <br /> vegetation. However, riparian ecosystems have been classified into "zones" which refer to the <br /> probability of annual flooding. Combined, these "zones" make up the 100-ywar f oodp"n or area <br /> expected to flood at least once in a 100-year period. <br /> The 100-year floodplain can be further divided into two areas on the basis of hazard potential. <br /> The floodway is the area within and adjacent to the stream banks required to discharge the <br /> 100-year flood without raising the water surface elevation more than one foot above base flood <br /> level at any point. Obstacles in the floodway can disrupt this function, increasing the potential for <br /> flood damage. The floodway fringe is the area bordering the floodway which will be inundated <br /> during a flood and hold the floodwaters until they can be carried away in the floodway channel. <br /> In 1980,the Federal Emergency Management Agency JUAA)prepared a Flood Insurance Stuff for <br /> Orange County.While the purpose of the study was to aid in the implementation of the National Flood <br /> Insurance Act of 1968 and local flood damage prevention programs, the study defined the boundaries <br /> of 100-year floodplains along major streams and rivers in the county. Orange County applied and was <br /> admitted to the federal Flood Insurance Program and subsequently adopted a Flood Damage <br /> Prevention Ordinance on March 2, 1981. The ordinance constitutes a major regulatory tool <br /> affecting the use of land constrained by flood hazards. <br /> Alluvial Soils. Not all of the 100-year floodplains in the county have been defined by FEMA. <br /> However, the Soil Survey of Orange County- N.C. contains information through which to identify <br /> soils subject to flooding. Alluvial soils are located along stream corridors and have resulted from <br /> repeated deposition by flood waters over time. They indicate not only past, but potential future, <br /> flooding. These soil types and their characteristics are listed on the following table. <br /> ALLUVIAL & HYDRIC SOILS <br /> Floodint Water Table <br /> Soil Type Frequency Duration Depth feet Kind <br /> Altavista Occasional Very brief 1.5 to 2.5 Apparent <br /> once or less in 2 years less than 2 days) (a thick zone <br /> Chewacla Common 0.5 to 1.5 of free water in <br /> Frequent Brief the soil) <br /> Congaree more than once in 2 ears 2 to 7'da s 2.5 to 4.0 <br /> Source: Soil Survey of Qrangg County.N.C.,U.S.D.A. Soil Conservation Service, 1977. <br /> The 100-year floodplains and alluvial soils in Orange County are shown on the Floodplain Map. <br /> Since floodplain areas are more extensive and overlay many alluvial soils,these features have been <br /> combined into a composite map. <br /> Wetlands <br /> Wetlands comprise one of the Earth's most productive natural ecosystems and have a set of common <br /> natural functions that make them valuable resources. These resource values can be summarized as <br /> follows: <br />
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