Culvert property sheet (obsolete)
This window displays the information for a culvert specified as a single object , a form that is now obsolete and not available for new DRAINS projects. For these, enter a headwall, pipe, overflow route and node, as shown below.
In the property sheet for the obsolete culvert object, the first page consists of the culvert name (of up to 10 characters) and various details of the geometry of the pipes.
For loss factors (Kentry + Kbends) the following factors may be used:
| Pipe Type | Arrangement | K Value |
| Circular Concrete Pipe | Projecting from fill, socket end | 0.2 |
Projecting from fill, square cut end | 0.5 | |
Headwall or headwall and wingwalls Socket end of pipe Square edge Rounded (radius = 1/12 D) |
0.2 0.5 0.2 | |
Mitred to conform to fill slope | 0.7 | |
End-section conforming to fill slope (Standard precast) | 0.5 | |
Bevelled edges, 33.7 or 45 degree bevels | 0.2 | |
Side-tapered or slope-tapered inlets | 0.2 | |
| Corrugated Steel Pipe, or Pipe Arch | Projecting from fill | 0.9 |
Headwall or headwall and wingwalls, square edge | 0.5 | |
Mitred to conform to fill slope | 0.7 | |
End-section conforming to fill slope (Standard prefab) | 0.5 | |
Bevelled edges, 33.7 or 45 degree bevels | 0.25 | |
Side-tapered or slope-tapered inlets | 0.2 | |
| Reinforced Concrete Box | Headwall: Square-edged on 3 edges Rounded on 3 edges to radius of 1/12 barrel dimension, or bevelled edges on 3 sides | 0.5 0.2 |
Wingwalls at 30 to 75 degrees to barrel: Square-edges at crown Crown edge rounded to radius of 1/12 barrel dimension, or bevelled top edge |
0.4 0.2 | |
Wingwalls at 10 to 25 degrees to barrel: Square-edges at crown | 0.5 | |
Wingwalls parallel (extension of sides): Square-edged at crown | 0.7 | |
Side-tapered or slope-tapered inlet: | 0.2 | |
Projecting: Square edge (estimated) Bevelled edges, 33.7 or 45 degree bevels |
0.7 0.2 |
(Source: AUSTROADS,1994)
To allow for overflows, the second page labelled ‘Weir Data’, allows you to define details of a weir with a horizontal crest – a weir coefficient, an overflow crest level and length of crest. In most cases, this will be the top of the road crossing the culvert. Alternatively, a water level v discharge relation may be applied to model complex profiles.
The culvert hydraulics methods used here are based on equations given by Henderson (1966) and Boyd (1986).
- AUSTROADS (1994) Waterway Design Manual, Sydney
- Boyd, M.B. (1986) Head-Discharge Relations for Culverts, Monier Rocla Technical Journal
- Henderson, F.M. (1966) Open Channel Flow, Macmillan, New York
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