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<br />:i8 <br /> <br /> <br />Ol1l859 <br /> <br />rocks the extent of weathering, and the amount of fracturing ,and Jault- <br /> <br />ing, and the porosity of the roc~ will be reflected in the runoff. In <br /> <br />the upper Cheyenne River basin for example (Culler, table 8 ), the <br /> <br />measured runoff frOl,'Il areas underlain by .shales was 2. 1/2. time s that <br /> <br />from areas underlain by Tertiary pediment gravels, with approxi- <br /> <br />matelyell.ualprecipitation. LOCal i!;'lformationofa similar nature <br /> <br />. <br /> <br />may be available ,for relating runoff or infiltration-capacity to geo- <br /> <br />logic rock type, all o{ which wiill permit better estimation of water <br /> <br />yield .from proposed stock ponlj. areas. <br /> <br />Methods of corrl!lating <br /> <br />Correlation analyses are coming into use as atbol in relating <br /> <br />the runoff from areas to variables of rainfalt amounts and intensity, <br /> <br />soil, geology, vegetation cover, channel characteristics; and drain- <br /> <br />age area. ' When data of this type are avaHabl.e for such an analysis, <br /> <br />. it is possible to give proper weight to all {actors aJfectirrg the runoff <br /> <br />available for stock-pond use. TJ;l.ese analyses will permit making <br /> <br />better adjustments of direct measured runoff to obtain estimates for <br />. , - <br /> <br />new area'or-better estimates of the frequencies of runoff from a <br /> <br />measured drainage area. <br /> <br />A :noni,ograph showing the general relati,ons between the drain~ <br /> <br />age ar,ea, the pr'ecipitation over temperature ratio, the annual <br /> <br />precipitation and the annual runoff in inches over the watershed are <br />