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1999 <br />1 matt Mixe * 13-02 Drainage and Sediment C-i~n!ro!P/an ~ 6 <br />' ,; :Table 13-12 5 ~ - ' <br />,. ~ .v s <br />-:YOAST MINES fx s.' ; a <br />~: -. . <br />- SEDIMENTATION POND SUMMARY ~~: ~ „ - - '=':1-- <br /> Pond012 Pond 013 Pond 014 <br />WATERSHED AREA lacresl: <br /> <br />Disturbed 288.7 24.24 117.80 <br />Undisturbed 30.6 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 />Princi al Spillway Invert Elevation 7,254.5 7,366.0 7,385.0 <br />Emer ency Spillway Invert Elevation 7,257.0 7,367.5 7,387.5 <br />Top of Embankment 7,260.0 7,370.0 7,390.0 <br /> <br />Stora a Volume Below Emer ency Spillway lac-ftl 20.82 4.62 12.72 <br />Stora a Volume Below Princi al S illway lac-ft) 17.23 3.74 10.47 <br /> <br />Principal Spillway Parameters: <br />Type Perforated <br />Riser Drop Inlet Drop Inlet <br />Riser Diameter lint 30 12 30 <br />Riser Hei ht Iftl 5 5 5 <br />Barrel Diameter (inl <br />Number of Holes in Riser <br />Size of Holes lin) <br />Elev. Of Holes 24 <br />3 <br />3 <br />7,252.0 12 <br />NA <br />- 24 <br />NA <br />- <br /> <br />Emer ency Spillway Parameters: <br />T e Tra ezoidal Tra ezoidal Tra ezoidal <br />Bottom Width Iftl 15 10 20 <br />Len th Iftl 50 30 30 <br />Side Slopes 'z'H:1V Iftl 3 3 3 <br />HYDROLOGIC/HYDRAULIC PARAMETERS: <br /> <br />10-Year, 24-Hour Storm Event: <br />Precipitation (in) 1.7 1.7 1.7 <br />Runoff Volume (ac-ftl 17.49 1.98 8.96 <br />Princi al Spillway Peak Dischar a Icfsl 33.5 4.4 34.0 <br />Emer ency Spillway Peak Dischar a (cfs) O 0 0 <br />Peak Surface Water Sta a Elevation Iftl 7256.6 7,367.4 7,387.1 <br /> <br />25-Year, 24-Hour Storm Event: <br />Precipitation lint 2.1 2.1 2.1 <br />RunofT Volume lac-ftl 25.02 2.79 12.36 <br />Principal S illway Peak Dischar a (cfs) N/A N/A N/A <br />Emergency Spillway Peak Dischar a (cfsl 122.5 22.8 84.9 <br />Peak Surface Water Sta a Elevation Iftl 7,259.0 7,368.5 7,388.8 <br />Pond Freeboard Iftl 1.0 1.5 1.2 <br />SEDIMENT LOADING PARAMETERS: <br /> <br />Storm Predicted Peak Settlable Concentration Iml/II 0.34 0.00 0.06 <br />Predicted Annual Sediment Loadin lac-ftl 13.98 1.49 6.08 <br />Available Sediment Stora a Volume lac-ftl 14.09 2.72 6.78 <br />Maximum Sediment Stara a Elevation Ift) 7,252.0 7,364.0 7,380.0 <br />Predicted Number of Storage Years 1.0 1.8 1.1 <br />TR-21 livired 06/02 <br />• <br /> <br />`~ <br />u <br />:bllVFl * 165 S. Union Boulevard, Suite 460 * Iakemaod, Colorado 80228 * (303J 763-S7J0 <br />