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Appendix B <br />PROTECTION OF THE HYDROLOGIC BALANCE <br />BOWIE NO.2 MINE <br />COAL MINE WASTE DISPOSAL AREA NO. 2 <br />Notes for Calculations: <br />1. Pages 1-8 present a spread sheet calculation of the required capacity of the <br />sediment pond F based on the 10 year event. <br />2. Design points are shown on Figure 2. <br />3. Ditches were sized using SEDCAD4. Ditches were sized using the 100 year event. <br />Page 45 shows the peak flow used to size the emergency and embankment spillways <br />using the 25 -year event in the SEDCAD4 program. <br />ENGINEER'S CERTIFICATION <br />The calculations and ' •.`ci;)re <br />d on the following pages with dates of 09/12 and <br />02/12 were prepar ►► rd� onths of February and September 2012, and the <br />information presen d ?aue and to the best of my knowledge and belief. <br />;43402 <br />Tamm6rr ., Stover p, P. E. Date <br />Regist erecf�Prq, 0ks : , ngineer <br />State of Colorado No. 43402 <br />TR -75 11/12 <br />Z�/t/13 <br />