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TUFLOW 1D Channels and Hydraulic Structures: Difference between revisions

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== How do I model blockage for irregular shaped culverts or channels? ==
For irregular shaped culverts and channels (set as1d_nwk "I" in the Type attribute of the 1d_nwk layertype), theit onlyis available methodpossible to model blockage is by using the Skew (in degrees) attribute in the 1d_xs layer. This reduces the effective flow width of the cross section by rotating it relative to the direction of flow and can be used to approximate reduced capacity due to debris or structural blockage.
 
A skew angle of 0 means the cross section is aligned with the flow. As the angle increases, the effective width is reduced. For example, a skew of 60 degrees results results in a 50% reduction (as cos(60) = 0.5). While this does reduce the effective width of the structure, it isn’t expected to see the same reduction to conveyance as conveyance depends on the Manning’s n value, flow area and hydraulic radius.
 
For more control over blockage representation, the pBlockage attribute is recommended where available (for example with circular culverts or 2D HX lines). However, for irregular shapes where pBlockage is not supported, using the a Skew (in degrees) attribute is the only available method.
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