2021-05-12_PERMIT FILE - C1981038 ‎(3)‎

• Permit No: C1981038
• IBM Index Class Name: Permit File
• Doc Date: 5/12/2021
• Doc Name: Surface Water Analyses
• Section_Exhibit Name: Volume 7 Exhibit 06 Drainage and Culvert Calculations
• Media Type: D
• Archive: No

ORCHARD VALLEY CULVERT "6" 10-YEAR
Design Discharge 10.000 cfs
Entrance Loss Coefficient 0.9
Pipe Length 40.000 feet
• Pipe Slope 6.000 8
Manning's n = 0.024
Maximum Headwater = 2.500 feet
Tailwater Depth 0.000 feet
Smallest Diameter Required to Pass Flow is 18 inches
PERFORMANCE CURVES:
Diameter: 15 inches
Headwater Discharge Flow
(ft)
------------- (cfs)
------------ Contr
-------- ol
---------------- Type
---------
. 0.25 0.47 Outlet (Subcritical) 1
0.50 0.95 Inlet (Supercritical) 3
0.75 1.72 Inlet (Supercritical) 3
1.00 2.63 Inlet (Supercritical) 3
1.25 3.67 Inlet (Supercritical) 3
1.50 4.71 Inlet (Supercritical) 4
1.75 5.61 Inlet 5
2.00 6.39 Inlet 5
2.25 7.09 Inlet 5
2.50 7.71 Inlet 5

Diameter: 18 inc hes
Headwater Discharge Flow
(ft)
------------- (cfs)
------------ Control
------------------------ 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
C 6/