PERMFILE49647

• Permit No: C1981029
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: 2.05.3 OPERATION PLAN PERMIT AREA
• Media Type: D
• Archive: No

TABLE 2.05.3-8
• SEDIMENT TRAP DESIGN
SUN COAL COMPANY - MEADOWS N0. 1
ROUTT COUNTY, COLORADO
Flow Calculations Into Trap:
Trap Q10 Q10 Q100 Q100
Location cfs Ac-Ft. cfs Ac-F t.
~- ~6 ~5- 1:45 ~.15-
3 .41 .13 1.45 0.47
4 .03 .04 0.14 0.16
7 1.80 .70 7.00 0.27
9 1.74 .82 6.75 3.17
10 1.13 .47 4.40 1.84
Runout
-T- .51 .17 1.81 .62
lA .55 .19 1.96 .67
2 .04 .OS 0.15 .28
3 2.60 .07 4.60 .12
4 2.64 1.56 10.20 6.05
5 3.98 .15 6.80 .26
~10 cfs - 10-year peak flow in cubic feet per second
10 ac-ft - 10-year total flow in acre- feet
Q100 cfs - 100-year peak flow in cubic feet per second
•
Q100 ac-ft - 100-year total flow in acre -feet
Flow Calculations From Trap:
Assume n = .040 Slope Outlet = 2~ Sideslopes 2:1
Trapezoidal Trap Outlet Velocity Below(i)
Trap Q100 Bottom Width Depth Outlet Structure
Location (cfs) (feet) (feet) (fps) (fps)
2 1.45 5 .174 1.60 6.6
3 1.45 5 .174 1.60 6.6
4 0.14 5 .043 0.64 3.7
7 7.00 5 .440 2.70 9.1
8 6.75 5 .430 2.68 9.6
10 4.40 5 .330 2.30 8.7
Runout
~- 1.81 5 .200 1.70 6.9
lA 1.96 10 .120 1.40 7.1
2 0.15 5 .050 0.66 3.7
3 4.60 10 .230 1.90 8.8
4 10.20 15 .300 2.20 10.7
5 6.60 5 .430 2.60 9.7
. (1) Assume slope increases to 10% and enters triangular channel 2:1 side slopes
n = .020
- 188 - (Rev. 5/86)