Conduit 
is a command (e.g. pipe, channel, etc.) that conveys water from one command to another one.
| Parameter Name | Description | Default Value |
|---|---|---|
| NHYD | Hydrograph number. | — |
| NAME | Name of the component. | — |
| From Node | The name of the from node. | — |
| To Node | The name of the destinated node. | — |
| COMMENT 1, 2, and 3 | Comment for the command. | — |
| Tag | Optional category or classification. | |
| System Type | Specifies the junction’s system type, whether it belongs in the overland, storm, or sanitary system. | Blank |
| Shape | Edit the geometric properties of the conduit’s cross-section. | CIRCULAR |
| Geometry 1, 2, 3, and 4 | Based on the selected shape, the value will change. | |
| Full Depth [m] | Maximum depth of the conduit’s cross section (m or ft) | 1 |
| Length [m] | Conduit length (m or ft) | 400 |
| Inlet Offset [m] | Depth or elevation of the conduit invert above the node inverts at the inlet end of the conduit (m or ft). | 0 |
| Outlet Offset [m] | Depth or elevation of the conduit invert above the node inverts at the outlet end of the conduit (m or ft). | 0 |
| Slope [%] | Slope of the conduit. | |
| Roughness | Manning’s roughness coefficient. | 0.01 |
| Initial Flow [m3/s] | Initial inflow in the conduit at the start of the simulation (flow units). | 0 |
| Flow Limit [m3/s] | Maximum flow in the conduit (flow unit)- use 0 or leave blank if not applicable. | 0 |
| Full Flow [m3/s] | Max/full flow. | 0 |
| Entry Loss Coeff. | Head loss coefficient associated with energy losses at the entrance of the conduit. | 0 |
| Exit Loss Coeff. | Head loss coefficient associated with energy losses at the exit of the conduit. | 0 |
| Ava. Loss Coeff. | Head loss coefficient associated with energy losses along the length of the conduit. | 0 |
| Flap Gate | YES, if the flap gate exists that prevents flow back through the conduit, or NO if no flap gate exists. | NO |
| Culvert Code | Code number of inlet geometry if the conduit is a culvert subject to possible inlet flow control – leave blank otherwise. | 0 |
| Inlet | Click on … to insert the features of the inlet. |
Conduits identified as culverts undergo ongoing monitoring during dynamic wave flow routing to assess whether they adhere to Inlet Control criteria as outlined in the Federal Highway Administration’s publication titled “Hydraulic Design of Highway Culverts” (Publication No. FHWA-NHI-01-020, May 2005).
Street and channel conduits equipped with inlet structures employ the methodologies specified in the Federal Highway Administration’s publication titled “Urban Drainage Design Manual – HEC-22” (Publication No. FHWA-NHI-10-009, August 2013) to ascertain the volume of flow they intercept.
Culver Code Numbers:
Circular Concrete
1 Square edge with headwall
2 Groove end with headwall
3 Groove end projecting
Circular Corrugated Metal Pipe
4 Headwall
5 Mitered to slope
6 Projecting
Circular Pipe, Beveled Ring Entrance
7 45 deg. bevels
8 33.7 deg. bevels
Rectangular Box; Flared Wingwalls
9 30-75 deg. wingwall flares
10 90 or 15 deg. wingwall flares
11 0 deg. wingwall flares (straight sides)
Rectangular Box;Flared Wingwalls and Top Edge Bevel
12 45 deg flare; 0.43D top edge bevel
13 18-33.7 deg. flare; 0.083D top edge bevel
Rectangular Box, 90-deg Headwall, Chamfered / Beveled Inlet Edges
14 chamfered 3/4-in.
15 beveled 1/2-in/ft at 45 deg (1:1)
16 beveled 1-in/ft at 33.7 deg (1:1.5)
Rectangular Box, Skewed Headwall, Chamfered / Beveled Inlet Edges
17 3/4” chamfered edge, 45 deg skewed headwall
18 3/4” chamfered edge, 30 deg skewed headwall
19 3/4” chamfered edge, 15 deg skewed headwall
20 45 deg beveled edge, 10-45 deg skewed headwall
Rectangular Box, Non-offset Flared Wingwalls, 3/4” Chamfer at Top of Inlet
21 45 deg (1:1) wingwall flare
22 8.4 deg (3:1) wingwall flare
23 18.4 deg (3:1) wingwall flare, 30 deg inlet skew
Rectangular Box, Offset Flared Wingwalls, Beveled Edge at Inlet Top
24 45 deg (1:1) flare, 0.042D top edge bevel
25 33.7 deg (1.5:1) flare, 0.083D top edge bevel
26 18.4 deg (3:1) flare, 0.083D top edge bevel
Corrugated Metal Box
27 90 deg headwall
28 Thick wall projecting
29 Thin wall projecting
Horizontal Ellipse Concrete
30 Square edge with headwall
31 Grooved end with headwall
32 Grooved end projecting
Vertical Ellipse Concrete
33 Square edge with headwall
34 Grooved end with headwall
35 Grooved end projecting
Pipe Arch, 18” Corner Radius, Corrugated Metal
36 90 deg headwall
37 Mitered to slope
38 Projecting
Pipe Arch, 18” Corner Radius, Corrugated Metal
39 Projecting
40 No bevels
41 33.7 deg bevels
Pipe Arch, 31” Corner Radius,Corrugated Metal
42 Projecting
43 No bevels
44 33.7 deg. bevels
Arch, Corrugated Metal
45 90 deg headwall
46 Mitered to slope
47 Thin wall projecting
