TUFLOW 1D Channels and Hydraulic Structures: Difference between revisions
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The key difference between a single wide culvert and multiple culverts with the same total width is the wetted perimeter. Multiple culverts have a slightly larger wetted perimeter due to the internal walls, which increases friction in downstream-controlled regimes. While friction losses are generally small compared to entry and exit losses, the impact on hydraulic behaviour is usually minor.
However, it’s important to model the configuration that best represents the actual structure when assessing culvert performance.
== How do I model a scruffy dome in TUFLOW? ==
A scruffy dome is a type of dome inlet screen placed over a drop inlet, commonly used in stormwater systems. These inlets can be modelled in TUFLOW using a 1D Q type pit with a depth-discharge curve that represents the hydraulic performance of the dome.
The Queensland Urban Drainage Manual (QUDM) recommends using the lesser of the weir flow or orifice flow equations to define inlet capacity (see Section 7.5.4). A blockage factor is suggested to account for potential debris build-up during flood events (see Table 7.5.1 Provision for blockage at kerb inlets). This factor may vary depending on local guidelines, so it’s worth checking your regional standards.
Once the rating curve is calculated, it can be added to the pit inlet database and linked to the Q type pit.
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