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_17_ <br />3. 100-. 50-, and 25-Year floods <br />The 100-, 50-, and 25-Year 1-hour design rainfall amounts are respectively: <br />2.1, 1.5, and 1.2 inches. Storm hydrographs generated from these storms <br />are plotted in Figures 8 and 9 for Curtis Creek at Rienau Mine. Calculations <br />are summarized in Appendix III- 6. Figure 10 shows peak discharge as a <br />function of recurrence interval for runoff curve numbers of 70, 75, and 80. <br />CN75 is recommended for design of key hydraulic structures at the mine <br />site. <br /> <br /> <br />