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<br /> <br />26. <br /> <br />Index stations. -- The 21 pivot stations were the nucleus for defining re- <br />gionalized flow-duration, curves for the base period 1921-56 at each site in <br />Kansas where there were 6 years or more of records of unregulated flow, or <br />records of regulated flow where the reservoir complex .remained the same <br />for at least 6 years. Thirteen stations of fairly-long unregulated flow were <br />closer than the pivot stations to many short-term stations and provided a <br />closer correlation during the short period of common record. These sta- <br />tions are called index stations of which station 119, Cottonwood River at <br />Cottonwood Falls, is typical. For the available period of record 1933-56, <br />flow duration data were plotted for pivot stations 75 and 93 located respe.c- <br />tively east and west of the index station. Correlation curves similar to those <br />on figure 2 were then prepared for period 1933-56. Using the known dis- <br />charges of the two pivot stations for the base period 1921-56, and the cor- <br />relation curves established for the concurrent period, two sets of discharges <br />were defined at the index station for the base period. An average of the two <br />sets of dischal'ges defined the regional flow-duration curve for Cottonwood <br />Falls as shown by the solid. curve on figure 120. Regional flow duration <br />curves for all index stations were developed from correlations with two or <br />more stations. <br /> <br />Satellite stations. --Stations other than pivot or index stations are called <br />satellites. Records for the satellite stations were correlated with the con- <br />current period of one or more pivot or index stations and extended to the <br />base period 1921-56 by the method described for extending .records for the <br />index stations. <br />