REV93309

• Permit No: C1981071
• IBM Index Class Name: Revision
• Doc Date: 8/21/1991
• Doc Name: MR 91-72 MODIFICATION OF PERMANENT ROAD CULVERTS C-1 C-2 AND C-3 PN C-81-071
• From: CYPRUS YAMPA VALLEY COAL CORP
• To: MLRD
• Type & Sequence: MR72
• Media Type: D
• Archive: No

SEDCAD+ CULVERT SIZING UTILITY
PERMANENT CULVERTS C1-3
Design Discharge = 12.000 cfs
Entrance Loss Coefficient = 0.9
Pipe Length = 40.000 feet
Pipe Slope = 2.000 Y
Manning's n = 0.014
Maximum Headwater = 2.500 feet
Tailwater Depth = 0.000 feet
Smallest Diameter Required to Pass Floe is 21 inches
PERFORMANCE CURVES:
Diameter: 18 inches
Headwater Discharge Flow
(ft)
------------- (cfs)
------------ Contr
-------- ol
---------------- Type
---------
0.25 0.54 Outlet (Subcritical) 2
0.50 1.12 Inlet (Supercritical) 3
0.75 2.04 Inlet (Supercritical) 3
1.00 3.15 Inlet (Supercritical) 3
1.25 4.40 Inlet (Supercritical) 3
1.50 5.78 Inlet (.Supercritical) 3
1.75 7.22 Inlet (Supercritical) 3
2.00 8.42 Inlet 5
2.25 9.50 Inlet 5
2.50
-------------
------------- 10.47
------------
------------ Inlet
--------
--------
----------------
---------------- 5
---------
---------
Diameter: 21 inches
Headwater Discharge Flow
(ft)
------------- (cfs)
------------ Contr
-------- ol
---------------- Type
---------
0.25 0.59 Outlet (Subcritical) 2
0.50 1.32 Inlet (Supercritical) 3
0.75 2.40 Inlet (Supercritical) 3
1.00 3.67 Inlet (Supercritical) 3
1.25 5.12 Inlet (Supercritical) 3
1.50 6.74 Inlet (Supercritical) 3
1.75 8.49 Inlet (Supercritical) 3
2.00 10.31 Inlet (Supercritical) 4
2.25 11.90 Inlet 5
2.50
-------------
------------- 13.32
------------
------------ Inlet
--------
--------
----------------
---------------- 5
---------
---------
Diameter: 24 inches
Headwater Discharge Flow
(ft)
------------- (cfs)
------------ Control
------------------------ Type
---------
0.25 0.65 Outlet (Subcritical) 2
0.50 1.51 Inlet (Supercritical) 3
0.75 2.73 Inlet (Supercritical) 3