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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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In rural areas, home and farm needs can be met by ground water yields of as little as three to five <br /> gallons per minute. In 1987, the U.S. Geological Survey conducted an analysis of well yields in <br /> the Blue Ridge and Piedmont portions of the state. Shown on the accompanying table are the <br /> average yields obtained from wells, by both geologic and hydrogeologic (water bearing potential) <br /> rock unit classification. <br /> WELL YIELDS- PIEDMONT NORTH CAROLINA <br /> Geologic Hydrogeologic Number Average Yield <br /> Rock Classification Rock Classification of Wells m <br /> Metamorphosed Granitic Felsic Metaigneous 791 19.1 <br /> Felsic Metavolcanic Felsic Metavolcanic 280 13.0 <br /> Intermediate Metavolcanic Intermediate Metavolcanic 43 16.8 <br /> Mafic Metavolcanic Mafic Metavolcanic 63 11.9 <br /> Metamorphosed Gabbro & Intermediate Metaigneous 284 18.4 <br /> Diorite <br /> Ph litte& Schist Ph litte 127 20.3 <br /> Metavolcanic E iclastic Metavolcanic E iclastic 95 16.9 <br /> Metasmudstone& Argillite 319 14.6 <br /> Meta-Argillite <br /> Chatham Group, Triassic Sedimentary 269 11.6 <br /> Undivided Rocks <br /> Source: Adapted from Statistical Analysis Relating to Well Yield to Construction Practices <br /> and Siting of Wells in the Piedmont and Blue Ridge Provinces of North Carolina, <br /> U.S. Geological Survey, 1987. <br /> The geologic rock units listed in the table are shown on the Geology Map. Although not shown in <br /> the table, well yields were generally greater where wells were located in draws and valleys, and <br /> lowest on hills and ridges. <br /> Floodplains <br /> The riparian zone of a river, stream or other body of water is the land adjacent to that body of water <br /> that is, at least periodically, influenced by flooding. In general terms, riparian ecosystems are found <br /> wherever streams or rivers at least occasionally cause flooding beyond their channel confines. Such <br /> ecosystems can be broad alluvial valleys or narrow strips of streambank vegetation <br /> The flooding of the riparian ecosystem is important for the maintenance of that system for several <br /> reasons. The flooding water and subsequent ground water levels are the main determinants of the type <br /> and productivity of vegetation found in the riparian zone. Flooding waters also bring nutrient-rich <br /> sediments to the floodplain, export organic and inorganic material from the floodplam, and serve as a <br /> primary agent for long-term aggradation(deposition of alluvial material)and degradation(downcutting <br /> of surface geology)of the floodplain. <br /> 100-Year Floodplain.The precise boundaries of riparian ecosystems, particularly on the upland edge, <br /> are difficult to determine because of seasonal and yearly changes in flooding levels, soil moisture, and <br />
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