QGIS SWMM Junctions Set Attributes: Difference between revisions
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=== Recommended Settings ===
The recommended settings for junctions within the 2D domain depends on whether the node receives flow from a subcatchment and whether and how the node is connected to the 2D domain.
'''Note:''' It is recommended that Ymax be set to 0.0 for all junctions. SWMM will set Ymax to highest soffit of connected conduits.
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It is recommended to allow ponding (set Apond >0). This will allow the head in the node (including pressure head) as a water level. If the water level in the node exceeds the water level in the 2D domain, there will be a flow from the 1D domain to 2D domain.<br>
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*'''Junction nodes connected to 2D with an inlet:'''<br>
:When nodes are connected through an inlet, either Ysur (surcharge depth) or Apond (area of ponding) can be used to allow the pressure head to exceed Ymax (by default highest adjacent conduit soffit). Using a positive area of ponding may enhance stability. When used, Apond should represent the manhole shaft or a small area. A larger area may enhance model stability but may artificially attenuate discharges. If Apond is non-zero, Ysur is ignored.<br>
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