2006-08-02_PERMIT FILE - C1980007 ‎(8)‎

• Permit No: C1980007
• IBM Index Class Name: Permit File
• Doc Date: 8/2/2006
• Doc Name: Hydrologic/Hydraulic Analysis for Roadway Drainage
• Section_Exhibit Name: Exhibit 75 SGARE Appendix G Report to Appendix E
• Media Type: D
• Archive: No

• 2.3 Hydrologic Model Output
Hydrologic model results aze included in a report generated by SEDCAD 4 (Appendix D). The
important output is summarized in the following Tables.
Peak Dischazee
Peak dschazges, Q~~, at the suboutlets shown on Plate I, are listed in Table 3.
Table 3 100-Year 24-Hour Peak Discharges
L
C~
Sub-Watershed Sub-Outlet Sub-Watershed Q~~ Accumulated Q~~
[No.] (Station] [cfs] [cfs]
1-1 166+50 11.56 74
31
1-2 166+50 20.34 .
2-1 149+35 6.46 44 58
2-1 149+35 7.78
4-1 145+10 7.64 51.24
5-1 142+IS 3.64 53.98
6-1 132+40 4.52 58
37
6-2 132+40 2.03 .
8-1 128+27 12.11 70.44
9-I 124+OS 3.44 71.97
10-1 122+15 1.75 73.20
13-1 119+10 11.99 85.00
15-1 110+80 5.66 90.34
17-1 105+00 4.19 93.69
18-1 95+80 6.72 97.99
19-1 95+00 7.85 120
09
19-2 95+00 10.17 .
20-1 95+00 5.67 120.09
21-1 84+10 4.45 62
126
21-2 84+10 3.56 .
Trunk Line and Cross Culvert Location and Size
Two trunk lines (corrugated steel pipe, CSP) and three cross culverts (CSP) were modeled and
designed following the requirements of the Forest Service and based on the site conditions. Trunk
line and cross culvert data are summarized in Table 4 and Table 5, and shown on Plate I. Refer
[o Mountain Coal Company, West Elk Mine, Plans of Proposed Access Road (the Design Plans
submitted in June 2005), Sheets SS-2, SS-3, and DR-1 to DR-5.
Sunrise Engineering, Inc.
Sylvester Culch Access Road
Hydrologic /Hydraulic Analyses for Roadway Drainage