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<br />. <br /> <br />APPENDIX A <br />HYDROLOGY <br /> <br />The hydrological analysis necessary for determining the peak discharges of the <br />10-, 50- and 100-, and 500-year floods for the Roaring Fork and Fryingpan <br />Rivers was performed by the U.S. Army Corps of Engineers (Reference 3). The <br />results were found to be suitable for this flood plain study, and therefore <br />no hydrological study was performed by Wright-McLaughl in Engineers. The <br />methodology used by the Corps of Engineers to mathematically predict the <br />peak flood flows is based upon a statistical analysis of historical stream- <br />flow data, For the purposes of this report, only the results of the hydro- <br />logical analysis were reported, For a detailed description of the hydrology <br />study performed, the reader is referred to the Corps of Engineers Hydrological <br />Report (Reference 3). Table Al gives the floodflows for the 10-, 50-, 100-, <br />and SOO-year floods. <br /> <br />.. The Roaring Fork drainage basin map shows the subbasins within the drainage <br />basin which contribute to the flood peaks given in Table Al. These subbasins <br />were planimetered from the basin map shown on Plate 1 and the areas of each <br />are listed in Table AI. <br /> <br />. <br />