HYDRO30303

• Permit No: C1980005
• IBM Index Class Name: Hydrology
• Doc Date: 6/5/1998
• Doc Name: SENECA II MINE C-80-005 TR-32 POSTMINING DRAINAGE CONTROL DESIGNS
• From: DMG
• To: SENECA COAL CO
• Permit Index Doc Type: CORRESPONDENCE
• Media Type: D
• Archive: No

SEDCAD+ CULVERT SIZING UTILITY
18a
Design Discharge = 20.000 cfs
Entrance Loss Coefficient = 0.9
Pipe Length = 40.000 feet
Pipe Slope = 2.000 °s
Manning~s n = 0.024
Maximum Headwater = 2.400 feet
Tailwater Depth = 0.000 feet ___
Smallest Diameter Required to Pass Flow is 36 inches

PERFORMANCE CURVES:
Diameter: 24 inches
Headwater Discharge Flow
(ft)
-------
-- (cfs)
----
---- Control
------------------------- Type
---------
--
--
0.24 ---
0.62 Outlet (Subcritical) 2
0.48 1.42 Inlet (Supercritical) 3
0.72 2.57 Inlet (Supercritical) 3
0.96 3.94 Inlet (Supercritical) 3
1.20 5.51 Inlet (Supercritical) 3
1.44 7.24 Inlet (Supercritical) 3
1.68 9.12 Inlet (Supercritical) 3
1.92 11.14 Inlet (Supercritical) 3
2.16 13.09 Inlet (Supercritical) 3
2.40 13.77 Outlet (Subcritical) 1
2.64 17.12 Inlet 5
2.88 18.65 Outlet 6
3.12 19.81 Outlet 6
3.36 20.85 Outlet 6
3.60 21.84 Outlet 6
* (Transition Region - Data may need to be smoothed.)
Diameter: 30 inches
Headwater Discharge Flow
(ft) (cfs) Control
------------------- Type
---------
-------------
0.24 ------------
0.72 -----
Outlet (Subcritical) 2
0.48 1.76 Inlet (Supercritical) 3
0.72 3.21 Inlet (Supercritical) 3
0.96 4.93 Inlet (Supercritical) 3
1.20 6.88 Inlet (Supercritical) 3
1.44 9.05 Inlet (Supercritical) 3
1.68 11.40 Inlet (Supercritical) 3
1.92 13.93 Inlet (Supercritical) 3
2.16 16.62 Inlet (Supercritical) 3
2.40 19.46 Inlet (Supercritical) 3
2.64 22.46 Inlet (Supercritical) 3
2.88 25.59 Inlet (Supercritical) 3
3.12 28.06 Inlet 5
3.36 30.50 Inlet 5
3.60 32.76 Inlet 5
A