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<br />90,OaOcubic feet per second. Flood characteristics of the Inter- <br /> <br /> <br />mediate Regional Flood for averaged maximum conditions within the <br /> <br /> <br />study reaches are shown on Table 3. <br /> <br />.. <br /> <br />Standard Project Flood <br /> <br /> <br />The Standard Project Flood is defined as the flood that <br /> <br /> <br />can be expected from the most severe combination of meteorological <br /> <br /> <br />and hydrological conditions--excluding extremely rare combinations-- <br /> <br /> <br />considered characteristic of the geographical region in which the <br /> <br /> <br />drainage basin is located. The Standard Project Flood represents <br /> <br /> <br />the reasonable upper limits of expected flooding. The Standard <br /> <br /> <br />Project Flood, with a peak discharge of 160,000 cubic feet per <br /> <br /> <br />second will be about 80 percent as large as the June 1965 Arkansas <br /> <br /> <br />River flood which had a peak discharge of 200,000 cubic feet per <br /> <br /> <br />second. Flood characteristics of the Standard Project Flood for <br /> <br /> <br />averaged maximum conditions within the study reaches are shown on <br /> <br />Table 3. <br /> <br />. <br /> <br />Frequency of Floods <br /> <br /> <br />The Intermediate Regional Flood is defined as having <br /> <br /> <br />an average occurrence frequency of once in 100 years at a designated <br /> <br /> <br />location. It is impractical, however, to assign a frequency to the <br /> <br /> <br />greater Standard Project Flood. Floods larger than the Standard <br /> <br /> <br />Project Flood are possible, but the combination of factors necessary <br /> <br /> <br />to produce such large flows would rarely occur. For purposes of <br /> <br /> <br />hazard evaluation, it is important to recognize that either of <br /> <br /> <br />these major floods can occur in any year and possibly in successive <br /> <br /> <br />years. <br /> <br />App. 4 <br />17 <br />