TUFLOW 1D Channels and Hydraulic Structures: Difference between revisions

== How can trash screens be represented? ==

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.

* In all 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 pBlockage attribute.<br>

For example, the image below could be represented as a rectangular shaped screen located upstream or downstream of a culvert, modelled as a short zero length RF (rectangular culvert with fixed losses) channel using a 1d_nwk GIS layer.

<ol>[[File:Trash screen schematicTrash_screen_schematic.png|alt=|300x300px]]