PERMFILE111152

• Permit No: C1996083A
• IBM Index Class Name: Permit File
• Doc Date: 5/12/2003
• Doc Name: pages 8-1 through 8-80i
• Section_Exhibit Name: Exhibit 08 Protection of the Hydrologic Balance
• Media Type: D
• Archive: Yes

V-Ditch Design
Ditch Grade Minimum Grade Maximum Grade Peak
Min Max Depth Velocity Depth Velocity Flow

C10
5.0%
50.0%
0.41
3.4
0 27 ......................
8~2
0.83
C11 7.0% 11.0% 0.47 4.4 0.43 5.2 1.44
C12 7.0% 12.0% 0 84 ?: ~i.$' 0 76 8 {) 6.84
C13 7.0% 11.0% 0.40 4.0 0.37 4.7 0.86
** C14 5.0% 50% Trapezoidal Channel C-Gulch 34.89
C15 7.0% 11.0% 0.38 3.8 0.35 4.6 0.75
C16 2.0% 5.0% 1.91 6.0 1 61 > „8:;5 32.87
C17 7.0% 11.0% 0.46 4.4 0.42 5.1 1.33
*** C18 33% 33% 0 68 ,,,,.. l2.3 0 68 ' 12.3. 8.25
*** C19 25% 25% 0.21 4.9 0.21 4.9 0.29
C-20 7.0% 11.0% 0.40 4.0 0.37 4.7 0.93
C-21 7.0% 11.0°Jo 0.34 3.6 0.31 4.2 0.59
C-22 7.0% 11.0% 0.91 6.9 0.84 8.2 8.37
C-23 7.0% 11.0% 0.94 7.0 0.87 8.4 9.13
C-24 40.0% 40.0% 0 61 12.& 0 61 15.5 6.84
** Ri rap lined trapezoidal channel in C-Gulch -See pages 8-17 - 8-19
*** Line with gunnite, concrete or other material to prevent infiltration.

Ditch D1 Trapezoidal Channel -See page 8-11
D2 2% 10% 1.48 5.1 109 9~3 16.41
E1 2% 2% 0.65 2.9 0.65 2.9 1.79
F1 2% 2% 0.46 2.3 0.46 2.3 0.70
F2 2% 2% 1.30 4.7 1.30 4.7 11.66
F3 2% 2% 191 6;fl 191 ta'~. 32.67
G 1 2% 2% 0.47 2.4 0.47 2.4 0.75
G2 2% 2% 0.22 1.4 0.22 1.4 0.10
Ditch $AE1 Deleted from Design
SAE2 Deleted from Design
Ditch FG1 30% 30% 0.21 5.4 0.21 5.4 0.33
Ditch GVB1 28% 28% 0.16 4.3 0.16 4.3 0.16
GVB2 17% 17% 0.15 3.2 0.15 3.2 0.11
GVB3 10% 10% 0.17 2.7 0.17 2.7 0.11
GVB4 47% 47% 0 20 fi«~ 0 20 ;: ~'i-5 0.35
GVB5 35% 35% 0.18 5.2 0.18 5.2 0.25
GVB6 15% 15% 0.20 3.7 0.20 3.7 0.20
Berm along coal stockpile pad - flow in ditches B 30, 31, 32
Heigth Velocity Heigth Veloci
1 % 2% 1.00 2.8 0.87 3.6 4.00
Berms Freeman Gulch
2% 4% 0.34 1.9 0.30 2.5 0.33
Provide riprap, gunnite or concrete lined V-Ditc h as
necessary for erosion rotection.
Ditches cut in rock will not require erosion protection.
Flow de pth in feet does not include 0.3 feet freeboard.
PR-07 EXH-8 - 291 - 2/03