2018-04-27_REVISION - M1980244

• Permit No: M1980244
• IBM Index Class Name: REVISION
• Doc Date: 4/27/2018
• Doc Name: Request for Technical Revision
• From: Newmont
• To: DRMS
• Type & Sequence: TR101
• Email Name: TC1
• Email Name: WHE
• Media Type: D
• Archive: No

Knight Piesold
CONSULTING Table2.4
Cripple Creek and Victor Gold Mining Co.(Newmont)
Cripple Creek and Victor Mine
Stormwater Management Plan Evaluation
Existing Diversion Channels 100-year/24-hour Storm Event Evaluation
Diversion Channel
Parameter
DC-EMPBb
Cross-section number ) 6 D - DC EMP17b 8N D. -
As-built longitudinal slope(%),S 10.0 4.8 23.0 3.6 1.5 0.5 10.0 27.9 23.9
As-built bottom width(ft),Bf 23.0 10.3 5.5 5.3 1.7 4.0 3.8 4.0 3.0
As-built side-slope(xH:1 V),Z 2.1 2.8 3.0 3.2 2.3 1.5 2.0 1.9 2.0
As-built channel depth(ft),Dc 4.0 2.8 2.6 1.0 3.6 2.8 2.4 1.5 1.6
As built freeboard depth(ft),Dfb 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0
As-built allowable normal flow depth(ft),Dn 3.0 1.8 1.6 0.0 2.6 1.8 1.4 0.5 0.6
As-built riprap median diameter(in),D50 3 3 6 9 3 9
As-built Manning's roughness(),n 0.03 0.04 0.04 0.04 NA 0.04 NA NA 0.10
As-built riprap safety factor(-),SF 0.26 0.33 0.35 2.68 NA 4.05 NA NA 0.70
As-built flow capacity(cfs),Qab 2,300 300 250 0 111 39 103 31 12
100-year/24-hour flow rate(cfs),0100/24 131 131 57 10 36 9 8 7 25
Capacity-Sufficient or Insufficient Sufficient Sufficient Sufficient I Sufficient Sufficient Sufficient Sufficient
Riprap D50-Sufficient or Insufficient I Sufficient Sufficient
Notes:
1.Capacity is deemed sufficient if the as-built flow capacity is equal to or greater than the 100-year/24-hour flow rate.Otherwise,insufficient.
2.Riprap D50 is deemed sufficient if the as-built riprap safety factor is equal to or greater than 1.2 for the 100-year/24-hour flow rate.Otherwise,insufficient.