PERMFILE63825

• Permit No: C1981035A
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: MODIFICATION A
• Section_Exhibit Name: APPENDIX 8 HYDROLOGIC DESIGNS
• Media Type: D
• Archive: Yes

• Reach 2 - armored open channel whcih begins at top of waste pile face (end of reach 1)
and carries flow to the open channel behind the office. It is trapezoidal with a
bottom width of 2, depth of 1.5 ft and side slopes of 2:1 and bed slope of
0.3571.
Reach 3 - 18" CMP which begins at the west drainage diversion and connects with
reach 4.
Reach 4 - 18" corrugated plastic pipe which is connected to reach 3 and discharges into
the open channel behind the office, reach 5.
Reach 5 -open channel which conveys diverted east and west basin runoff to the offsite
discharge point.
Reach 6 -trapezoidal open channel with a depth and width which both vary from one to
two feet.
Reach 7 - 36" concrete pipe, 24' CMP and 24" Plastic which drains portions of the yard.
Reach 8 - trapezoidal open channel with five foot bottom width and 5 foot depth.
Reach 9 - 24" CMP.
Reach 10 -open channel with a minimum triangular design section two feet deep and
2:1 side slopes with a bed slope of 1%.
Reach 10a - armored open channel that begins at top of waste pile face (end of reach
10) and carries flow to the bottom of the pile. It is trapezoidal with a bottom
width of 2, depth of 1.5 ft and side slopes of 2:1 and bed slope of 0.3571.
Reach 11 -30" CMP.
Reach 12-open channel swale, minimum average shape is triangular with a depth of 0.3
feet, side slopes of 15:1, bottom width of 1 ft, bed slope of 1%.
• Reach 13 -triangular open channel with a depth of one foot and a top width of 1.5 feet.
The required discharges from the hydrologic analysis reported on in Section 4.1 and
the computed discharge capacities are summarized in the following table. Note that in all
cases the required discharge is exceeded by the actual capacity.
DESIGN CHARACTERISTICS FOR PIPES AND CHANNELS
Location Existing or
Required Required
Discharge Bed or
Invert Slope Diameter or Depth x
Side Slope x Width (ft) Discharge
Capacity
reach 1 re 'd channel 5.9 ds 0.010 trian 2x2:1 x8 14.5 ds
reach 2 re 'd i e 5.9 cfs 0.357 tra 1.5x2:1x2 6.7 cfs
reach 3 existin i e 4.6 cfs 0.100 18" 14.4 ds
reach 4 exst. i 1993 4.6 ds 0.038 18" 8.9 cfs
reach 5 existin channel 10.5 cfs 0.041 va , 1.7x exst.X4 17.2 ds
reach 6 existin channel 0.9 0.011- 0.060 tra , 1 x exst xt 7.60 ds
reach 7a existin < 6 cfs 0.002 36" RCP 35 cfs
reach 7b existin < 6 ds 0.050 24" CMP 27 ds
reach 7c existin <6 ds 0.023 24" Corr ted lastic 18 cfs
reach 8 existin channel < 6 ds 0.058 tra , Sxexstx5 400 cfs
reach 9 existin i 0.9 0.044 24" 21 ds
reach 10 re 'd channel 4.4 cfs 0.010 trian 2x2:1x8 14.5 ds

8
January 1998