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Subject Protection of the <br />ilvdrolocic Svstem <br />• Somerset Coal Mine - Ellc Creek <br />Drainage Above East Storage Yard <br />CALCULATION NOTES <br />By M. O. Anderson <br />Checked <br />Acct <br />October 17-18 1979 <br />Sheet No. 2 of 5 Sheets <br />Weighted CN = 49. 57 use CN 50 for AMG-II Potential. <br />From table 10.1 (S. C. S. , N. E. Handbook, Hydrology) AMC-I Potential is <br />GN 31 <br />i <br />i <br />~~ i <br />i <br />I <br />I <br />Calculated Runoff for AMC-II Potential <br />CN 50 5= 10.0 x.2= 2.0 <br />x.8-8.0 <br />2 z <br />P + . 86 1 . 9 + 8. 0 <br />P = 1.90" (10 yr 24-hr Storrsl) <br />Table 10.1 shows curve starts where P = 2. 0" <br />2. 0" ~ 1.90" which is the storm intensity fora 10-year 24-hour Storm <br />AMC-I Potential - No runoff would occur. <br />i <br />B-36 <br />