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• W83028711 abstract "Draft-storage-frequency relations, which show the storage required for a reservoir to furnish a specified withdrawal or draft are regionalized for four zones in the State, using the mean annual flow of the streams as an index. The differences between the zones primarily reflect differences in the variability of stream flow.To assure the available draft will fall below 75 percent of the mean annual flow of a stream only once in 50 years on the average, a reservoir in the mountains would need a usable storage capacity of 45 percent of the mean annual runoff of the impounded stream. In comparison, reservoirs in parts of the Piedmont furnishing a draft of 75 percent of the mean annual flow must have usable storage equal to 60 percent of the mean annual runoff of the stream. In the inner Coastal Plain the storage required increases to 84 per-cent, and in the outer Coastal Plain to about 110 percent. These increases in storage necessary to furnish a certain draft are indicative of the general increase in streamflow variability, both seasonally and between years, that occurs from west to east in the State. Net evaporative draft, the evaporative loss from reservoirs when annual evaporation exceeds annual precipitation, also varies from west to east. For instance, a reservoir impounding a Piedmont stream, and designed with a 5 percent chance of deficiency, will have a net evaporative draft about twice as large as a similar sized reservoir in the Coastal Plain. In the mountains, annual precipitation always exceeds evaporation because of the cooler temperatures and higher rates of precipitation. Annual net evaporation is also proportionately smaller for large reservoirs than for small ones. On a Coastal Plain reservoir, with storage equivalent to the mean annual runoff of the stream and being drafted at 90 percent of the mean annual flow, the net evaporation for a stream with a mean annual runoff of only 500 acre-feet (0.62 cubic hectometres) is three times as great as for a stream with mean annual runoff of 100,000 acre-feet (123 cubic hectometres). Thus, one large reservoir has less evaporation loss than several small ones capable of furnishing, collectively, the same reliable draft.Under some circumstances, sedimentation can quickly reduce the available storage in a reservoir, thus decreasing the reliable draft. Estimated sedi-mentation rates in the Piedmont can range from 240 acre-feet per year (0.3 cubic hectometres per year) in a severely exposed drainage basin of 10 square miles (26 square kilometres) to 0.4 acre-feet per year (493 cubic metres per year) in a wooded basin of the same size. Seepage beneath and around a reservoir dam is normally not significant in the State. The usual engineering practices should be followed, however, to avoid locating the dam on an open or active fault, cavernous limestone, or continuous beds of sand or gravel." @default.
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• W83028711 date "1975-01-01" @default.
• W83028711 modified "2023-09-26" @default.
• W83028711 title "Evaluation of reservoir sites in North Carolina: Regional relations for estimating the reservoir capacity needed for a dependable water supply" @default.
• W83028711 doi "https://doi.org/10.3133/wri7446" @default.
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