TUFLOW 1D Channels and Hydraulic Structures: Difference between revisions
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A trash screen is a physical barrier, typically made from bars or mesh, placed at the inlet or outlet of a culvert, pipe, or channel to prevent debris from entering or exiting the structure.
Trash screens can be represented by applying additional head losses and blockage effects in accordance with the QUDM guidance. The approach depends on the location of the screen and the degree of blockage
Where the screen is attached directly to the culvert inlet or outlet, the losses are applied to the culvert itself. For screens located upstream or downstream of the culvert, a short zero length channel should be set up as an RF (rectangular culvert with fixed losses) type in the 1d_nwk GIS layer to represent the screen. In both cases, the net flow area should be reduced to account for the bars and any debris blockage, either by adjusting the flow area directly or by using the %blockage option.
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