TUFLOW 1D Channels and Hydraulic Structures: Difference between revisions
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** Two culverts are connected in series. The first is the normal culvert, and the second is a very short culvert with a smaller opening sized to the fish baffle gaps.
For both options, sensitivity testing is recommended because at low flows the way the culvert is defined can change the results. These methods do not include turbulence or detailed 3D water movement around the baffles. If accurate fish passage flows are required, a CFD
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[[File:Rectangular culvert baffled.png|alt=|300x300px]]
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== How can a flow splitter with a nib wall be modelled? ==
<span style="color:red; font-weight:bold;">UNDER CONSTRUCTION</span>
A flow splitter with a nib wall can be modelled by introducing a 1D weir between the manhole and the relevant outlet pipe. The weir crest elevation should be set equal to the height of the nib wall within the chamber. This setup allows low flows to discharge through one pipe, while higher flows overtop the weir into a secondary outlet, replicating the behaviour of a physical flow splitter.
The main outlet pipes are connected through a manhole, which automatically applies appropriate entry and exit losses. For outlets that do not connect further downstream, entry and exit losses should be manually defined in the attributes.
Refer to the schematic example below for this configuration.
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[[File:Manhole flow splitter topview.png|alt=|300x300px]]
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