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February 1999 Yoarr Mine * 13-12 Drainage and Sed(ment Coa[ml Plan 1 6 <br />w ~- Table 13.12.5 ' ,~ , ~ ` <br />g ~ e YOAST MiN~ ~ ,~ +, 3 k ~ ~ <br />"»~' ~r~ . ,~. ~„~ , . _-~°s, _ s,,,, ". ~ S~~OyENTATION;P_f)~jD,SU(u'tMdRY '`; ~,,.~~,.°~`` ''~` ~ ~ ~`~ ~„ ,~",' ~ ~<`~~: <br />t k~:, r <~: ~3;-.wPbnddl2~t°' Pbnd0,13-<<=.i ~ Pond014` ~: <br />WATERSHED AREA acres <br /> <br />Disturbed 272.7 24.24 117.80 <br />Undisturbed 46.6 9.80 36.50 <br />Total Area 319.30 34.04 154.30 <br />POND PARAMETERS: <br /> <br />Bottom Elevation 7,226.0 7,355.0 7,360.0 <br />Pdnci al S illwa Invert Elevation 7,254.5 7,366.0 7,385.0 <br />Emer en S illwa Invert Elevation 7,257.0 7,367.5 7,387.5 <br />T of Embankment 7,260.0 7,370.0 7,390.0 <br /> <br />Stara a Volume Below Emer enc 5 illwa ac-ft 20.82 4.62 12.72 <br />Story a Volume Below Pdnci al S 'llwa ac-tt 17.23 3.74 10.47 <br /> <br />Princi al S illwa Parameters: <br />Type Perforated <br />Riser Drop Inlet Drop Inlet <br />Riser Diameter in 30 12 30 <br />Riser Hei ht ff 5 5 5 <br />Bartel Diameter (in) <br />Number of Holes in Riser <br />Size of Holes (in) <br />Elev. OF Holes 24 <br />3 <br />3 <br />7,252.0 t2 <br />NA <br />- 24 <br />NA <br />- <br /> <br />Emer enc S illwa Parameters: <br />- T e - Tra ezoidal .T ezoidal T2 ezoidal <br />Bottom Width ft ~ 15 ~ 10 20 <br />-Len tt 50 ~ 30 30. <br />Side SlopeS'z'H:1V (ft) 3.' ~ 3 3 <br />HYDROLOGICMYDRAULIC PARAMETERS: <br /> <br />10-Year, 24-Hour Storm Event: <br />Preci nation in 1.7 1.7 1.7 <br />Runoff Volume ac-ff 16:6. 1.98 8.96 <br />Princi al S illwa Peak Dischar a cfs 32.3 4.4 34.0 <br />Emer enc S illwa Peak Discha a cfs 0 0 0 <br />Peak Surface Water Sta a Elevation tt 7,256.4 7,367.4 7,387.1 <br /> <br />25-Year, 24-Hour Storm Event: <br />Preci nation in 2.1 2.1 2.1 <br />Runoff Volume ac-ft 23.8 2.79 12.36 <br />Princi I S illwa Peak Dischar a cfs WA N/A N/A <br />Emer enc S illwa Peak Dischar a cfs 112.7 22.8 84.9 <br />Peak Surface W ater Sta a Elevation tt 7,258.9 7,368.5 7,388.8 <br />Pond Freeboard (ff) 1.1 1.5 1.2 <br />SEDIMENT LOADING PARAMETERS: <br /> <br />Stone Predicted Peak Settlable Concentration ml/I 0.19 0.00 0.06 <br />Predicted Annual Sediment Loadin acff 13.3 7.49 6.08 <br />Available Sediment Story a Volume ac-ff 13.3 2.72 6.78 <br />Maximum Sediment Story a Elevation ff 7,251.3 7.364.0 7,380.0 <br />Predicted Number of Storage Years 1.0 7.8 1.1 <br /> <br /> <br />A9ortlgomery IV'alton Miniag Grout * 165 S. Gnim+ Bouleonr~! Sui[e 460 * L.akemood, Colorado 80228 * (303J 763-5740 <br />