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The existing pond is small but has been calculated from the topography information to <br />have the following stage storage relationship: <br />I Pflnd at Anex No. 2 Mine <br />Elevation-Area-Capacity Table <br /> <br />tlevation Area <br /> <br />(ac) Capaoiry <br /> <br />(ac•h) <br />7,479.00 0.21D 0.000 <br />~ <br />7,480.00 0.220_ 0.215 <br />7,481.00 <br />7,482.00 0.240 <br />0.250 _ 0445 <br />0.690 <br />7,483.D0 0.26D D.945 <br />7,484.00 0.28D 1.215 <br />It will be assumed that the entire peak flow from the drainage area will not be <br />attenuated by the pond structure, therefore, the emergency spillway design is based on <br />2.26 cfs. Riprap lining is used with a D50 of 1.50 inches. The program spillway design <br />parameters and results are as follows: <br />Material: Rinra <br />Trapezoidal Channel <br />Bottom l~ Right Freeboard Freeboard Freeboard <br />Sldeslope Sideslope Slope (%) Mult. x <br />Wldtli (ft) Ratio Ratio Dep[h (ft) °h of Deter (YxD) <br />I.OD 1.0:1 1.0:1 1.0 I.pO <br />PADER Method -Mild Slope Design <br /> w/o Reebcvrd w/ Freeboard <br />DeSgn otuharge: 2.28 cfs <br />DBpth: 0.57 R 1.57 ft <br />Yop Width: 2.14 ft 4.14 R <br /> <br />vdadry: <br />2.SZ fps i <br />i <br />X-SBC000 Arw: 0.90 Sq ft <br />HYd2ulic Radius: 0.343 j <br />r-r9ude Number: 0.69 -~ ~ <br />Menning'a n: 0.0290 <br />Omin: 1.00 in <br />D50: 1.301n <br />Omax: 9.00 in <br />l~3- a- T1zr3 <br />