2015-01-30_PERMIT FILE - C1996083A ‎(21)‎

• Permit No: C1996083A
• IBM Index Class Name: Permit File
• Doc Date: 1/30/2015
• Doc Name: pages EXH 8-98 to EXH 8-245
• Section_Exhibit Name: Volume III Exhibit 08 Protection of the Hydrologic Balance Part 2
• Media Type: D
• Archive: Yes

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•
SEDCAD 4.0
Reclamation Ditch Design Though Reclaimed B -Seam
Portal
Material: Riprag
Trapezoidal Channel
Bottom Left Right
Freeboard Freeboard Freeboard
Width (ft) Sideslope Sideslope Slope ( %)
e� - - Mult x
Ratio Ratio
of
Depth (ft) Depth (VxD)
4.00 1.5:1 1.5:1 35.0
1.00
Simons /OSM Method - Steep Slope Design
Velocity and Manning's n calculations may not apply for this method.
This design is for a post mining drainage channel that will be constructed in the ephemeral
channel after the B -Seam portal area is restored to approximate original contour. See Map 18
Post Mining Contours. Two flow values were considered for the channel design. The first was
the flow rate for ditch B -6 (2.63 cfs) and the second was the 10 -year flow event for Pond B
(17.05 cfs). There was very little difference in the required channel configuration because of
the steep slope design method. Therefore, the channel will be designed using the ultra
conservative 17.05 cfs flow. The results are shown above.
The calculations and inf4 i�%�t+ge1 pfes�e►i this page were prepared by me during the
month of April 2002, ani40formation��if2s�ited is true and correct to the best of my
knowledge and belief. *pl 1�;?3 i
P4 -a
SEDCAD Utility Run
PR -07 A PPPOVCb
5/t1 jai
le lis RVXstnal Engineer
State of Colorado No. 19230
Exh8 - 190 -
Printed 04 -21 -2003
4/03
w/o Freeboard w/ Freeboard
Design Discharge:
17.05 cis
Depth:
0.14 It 1.14 ft
Top Width:
4.43 ft 7.43 ft
Velocity*:
X- Section Area:
0.61 sq ft
Hydraulic Radius:
0.135
Froude Number*:
Manning's n *:
Dmin:
6.00 in
D50:
18.00 in
Dmax:
22.50 in
Velocity and Manning's n calculations may not apply for this method.
This design is for a post mining drainage channel that will be constructed in the ephemeral
channel after the B -Seam portal area is restored to approximate original contour. See Map 18
Post Mining Contours. Two flow values were considered for the channel design. The first was
the flow rate for ditch B -6 (2.63 cfs) and the second was the 10 -year flow event for Pond B
(17.05 cfs). There was very little difference in the required channel configuration because of
the steep slope design method. Therefore, the channel will be designed using the ultra
conservative 17.05 cfs flow. The results are shown above.
The calculations and inf4 i�%�t+ge1 pfes�e►i this page were prepared by me during the
month of April 2002, ani40formation��if2s�ited is true and correct to the best of my
knowledge and belief. *pl 1�;?3 i
P4 -a
SEDCAD Utility Run
PR -07 A PPPOVCb
5/t1 jai
le lis RVXstnal Engineer
State of Colorado No. 19230
Exh8 - 190 -
Printed 04 -21 -2003
4/03