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<br />. <br /> <br />1+4 <br /> <br /> <br />0:,1823 <br /> <br />. <br /> <br />Volume of the mQximUJn flood, Qnd the frequency ,md vohune <br /> <br /> <br />of lesser floods have been estinlc,ted fror.l a consideration of: <br /> <br /> <br />(n) Expected rD.infall <br /> <br /> <br />(b) Absorptive capacity of the watershed <br /> <br /> <br />(c) Form of hydrograph as determined from recorded floods. <br /> <br /> <br />!Viax:imml Storm <br />The storm which centered over the Kiowa Creek watershed <br />on MemoriQl Day of 1935, is the most severe that l~s occurred in <br />Colorado ov._~r any considerable area. This storm, which affected <br />only the pl,ccins area, is not believed applicable to the Purgatoire <br />h'J.sin as its occurrence requires open nppronches for large air masses <br /> <br /> <br />pormitting the wnrm tlOisture ltlderl m~,~8S to be forced upwc.rd r!J.pidly. <br /> <br /> <br />The Pueblo storr" of 1921, drawing 256-D-lll, rosulted in <br /> <br /> <br />Q concentration of rQinfnll of $.5 inches over an Qrea of 61,2 square <br /> <br /> <br />,,;iles equc,l to tlKlt [LboVG the Sopris resGrvoir. <br /> <br /> <br />It has previously been stated th~t the Pueblo type ,of <br /> <br /> <br />storm may be exceeded somewhat on the Purgatoire watershed above <br /> <br /> <br />Trinidnd. MQximw.1 rainfall may be expected following Q few days <br /> <br /> <br />of generQl rain as for tIle 1904 storm above Trinidad. The <br /> <br /> <br />probabi,lity of the mD.x:tr.1Ul;1 two days of rQinfc.ll for the greatest <br /> <br /> <br />storm of each ye"r (1900-1936) ovor the PurgQtoire Rivor biwin, <br /> <br /> <br />c,S recorded by U. S. Wenther BureLu stations i,n cmd adjacent to <br /> <br /> <br />the watershed Qbove the Sopris reservoir, is shown on drawing <br /> <br /> <br />25b-D-113. These data approach a limit of lO inches of precipitation <br /> <br />. <br />