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<br /> <br />, <br /> <br />River at South Platte (No. 7075) June 1-11, 1914, as snowmelt base <br /> <br />flow and combining these discharges with those of the rainflood com- <br /> <br />puted for the 433-square-mile area intervening between Two Forks <br /> <br />damsite and Chatfield Dam, The rainflood hydrograph for the 433-squre" <br /> <br />miles had a peak discharge of 166,980 cfs, which combined with the <br /> <br />flood from above Two Forks damsite, gave a peak inflow discharge of <br />f) "...( J-f e!d rt..~5dr"':JI'''' <br />218,620 cfs. cH _'" n . <br /> <br />Computation of lOF for Narrows Damsite and Weld County Damsite <br /> <br />Stream routing and comination of subarea floods, - We have termed the <br /> <br />stream routing procedure selected for use in this study "The Modified <br /> <br />Wilson Method" because of 3daptations which have been made for <br /> <br />mathematical application of the Wilson2/ graphicalmethod.as a stream <br /> <br />routing procedure, An equation for mathematical application of Wilson's <br /> <br />graphical routing method was given in U.S. Department of Agriculture <br /> <br />Soil Conservation Engineering Handbook Supplement A, 1956. Our <br /> <br />modified Wilson method uses the mathematical ,equation and the concept <br /> <br />of 'streamflow as two components (translation and storage) which can be <br /> <br />evaluated separately. <br /> <br />._ c <br /> <br />The procedure for applying the modified Wilson method to route a flood <br /> <br />hydrograph through a specific reach of a stream is as follows: <br /> <br />l/Wilson, Water T., "A Grap,hical Flood-Routing Method," Transactions, <br /> <br />American Geophysical Union, Part III, 1941. <br /> <br />19 <br /> <br />....~.A_ <br /> <br />. -,- . .....~.-- '-',,~-""'-,. . . -......;. <br /> <br />.. ~-..., . 'I~~.~~ ;~.__...r......~'",_. ..~'......._.,t_.. ....,- -~a;L ""~"" . ..../iJ't. <br /> <br />'U"" <br /> <br />. <br />