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<br /> <br />r.,;, <br />, . " ."\'" <br />,I" <br />, ' <br />.:! <br />,> <br /> <br />. <br /> <br />Envelope Curves <br /> <br />A more conservative value for the QIOO, Q50 and Q25 can be read from <br />the envelope curves dated March 3, 1966 found with the cross drainage <br />studies of the Arkansas Valley Conveyance System (D.P.I. Chief's <br />letter of March 30, 1966). Those values"are as follows: <br />, , <br /> <br />Return Period <br /> <br />Q <br />Halfmoon <br />24 sq .m!. <br /> <br />Q <br />Malta <br />97 sq.mi. <br /> <br />25 <br />50 <br />100 <br /> <br />1050 <br />1380 <br />1800' <br /> <br />1720 <br />2260 <br />2970 <br /> <br />The upper end of the 100-year envelope curve is controlled by the <br />maximum peak at the gage Arkansas River at Granite, adjusted for <br />transmountain diversions. A copy of the envelope curve above 10 <br />miles is attached. It 'will be noted that the slope of the line <br />relating discharge to drainage-area-ratio would give an exponent <br />of about 0.35. ' <br /> <br />Conclusion <br /> <br />. <br /> <br />All the various streamflow probability computations and the plotted <br />results of each are attached. For the time being, the values <br />developed from the records of gages nearest the points of diversion <br />are being used as preliminary values. <br /> <br />. <br /> <br />, <br /> <br />------~ <br /> <br />Q <br />