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PERMFILE67733
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PERMFILE67733
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Entry Properties
Last modified
8/24/2016 11:13:27 PM
Creation date
11/20/2007 10:01:12 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981019
IBM Index Class Name
Permit File
Doc Date
9/2/2004
Doc Name
Attachment 1 to 9
Section_Exhibit Name
Exhibit 07 Gulch A Pond - 004A
Media Type
D
Archive
No
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C~ <br /> <br />COLOWYO COAL COMPANY <br />004A-GULCH A <br />SEDIMENTATION POND SUMMARY <br /> ORIGINAL 1996 1998 2002 DIFFERENCE <br /> CONFIGURATION STUDY STUDY DIFFERENCE STUDY 1998 TO 2002 <br />ATERSHED AREA (acres): <br />Disturbed 0.0 0.0 0.0 0.0 <br />Postmining Topsoiled and Seeded 59.1 89.5 30.4 36.4 -53.1 <br />Postmining Undisturbed 61.4 58.0 -3.4 69.7 11.7 <br />1-2 Year Reclamation 28.2 72.9 44.7 46.2 -26.7 <br />3+Year Reclamation 581.2 421.3 -159.9 565.8 144.5 <br />Total Area 729.9 641.7 -88.2 718.1 76.4 <br />POND PARAMETERS: <br />Bottom Elevation 6604.8 6604.8 6605.0 0.2 6605.0 0.0 <br />Principal Spillway Invert Elevation 6618.2 6616.0 6617.5 1.5 6617.5 0.0 <br />Emergency Spillway Invert Elevation 6619.2 6619.3 6619.2 -0.1 6619.2 0.0 <br />Top of Embankment 6621.2 6621.2 6621.0 -0.2 6621.0 0.0 <br />Storage Volume Below Emergency Spillway (ao-%) 7.06 7.06 6.65 -0.41 6.7 0.0 <br />Storage Volume Below Pdncipal Spillway (ac-%) 5.21 4.77 5.25 0.48 5.7 0.4 <br />Principal Spillway Parameters: <br />Type Drop Inlet Drop Inlet Pert. Riser Perf. Riser <br />Riser Diameter (in) 12.0 12.0 12.0 0.0 12.0 0.0 <br />Riser Heignt (ft) 2.0 3.5 1.5 3.5 0.0 <br />Bartel Diameter (in) 12.0 12.0 12.0 0.0 12.0 0.0 <br />Elevation of Perforation(s) (%) N/A N/A 6615.5 6615.5 <br />Size of Perforation(s) (in) N/A N/A 3.0 3.0 <br />Number of Pertorations N/A N/A 2 2.0 <br />Emergenq Spillway Parameters: <br />Type Trapezoidal Trapezoidal Trapezoidal Trapezoidal <br />Diameter (in) N/A N/A N/A N/A <br />Bottom Wdth (%) 15.0 15.0 15.0 0.0 15.0 0.0 <br />Length (%) 30.0 40.0 30.0 -10.0 30.0 0.0 <br />Side Slopes'i H:tV (ft) 1.5 3.0 1.5 -1.5 1.5 0.0 <br />HYDROLOGIC/HYDRAULIC PARAMETERS: <br />Base Flow Rates (cfs) 3.0 0.0 -3.0 0.00 0.0 <br />10-Year, 24-Hour Storm Event: <br />Precipitation (in) 1.8 1.8 0.0 1.8 0.0 <br />Runoff Volume (ac%) 3.5 5.4 1.9 0.9 -4.5 <br />Principal Spillway Peak Discharge (crs) 6.4 4.8 -1.6 0.4 -4.4 <br />Emergency Spillway Peak Discharge (cfs) 0.0 0.0 0.0 0.0 0.0 <br />Peak Sudace Water Stage Elevation (%) 6618.9 6619.1 0.2 6616.2 -3.0 <br />25-Year, 24-HOUr Storm EvenC <br />Precipitation (in) 2.3 2.3 0.0 2.3 0.0 <br />Runo%Volume (ao-ft) 6.6 9.5 2.9 4.7 4.8 <br />Principal Spillway Peak Discharge (cfs) 7.2 6.0 -1.2 2.7 -3.3 <br />Emergency Spillway Peak Discharge (cfs) 9.9 18.7 8.8 0.0 -18.7 <br />Peak Sudace Water Stage Elevation (%) 6619.7 6620.0 0.3 6618.0 -2.0 <br />Pond Freeboard (%) 1.5 1.0 -0.5 3.0 2.0 <br />SEDIMENT LOADING PARAMETERS: <br />Storm Predicted Peak Settlable Concentration (ml/I) 0.00 0.00 0.0 0.00 0.0 <br />Predicted Annual Sediment Loading (ao-%) 0.13 0.23 0.10 0.17 -0.1 <br />Available Sediment Stomge Volume (ao-%) 3.38 2.82 -0.56 2.85 0.0 <br />Maximum Sediment Storage Elevation (%) 6614.0 6614.0 6614.0 0.0 6614.0 0.0 <br />Predicted Number of Store a Years 26.0 12.3 -13.7 17.2 4.9 <br />I <br />
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