QGIS SWMM Junctions Set Attributes: Difference between revisions
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<li>'''Nodes connected to the 2D without inlets (through embankment culvert):'''
:*'''Ysur:''' Sets the surcharge at nodes connected to the 2D with inlets. Recommended value is 0.0.
:*'''Apond:''' Set to the approximate area of the 2D cells associated with the 1D/2D BC culvert connections layer(s). A larger area may improve stability, but may artificially attenuate discharges.
<li>'''Nodes connected to 2D with inlets (underground pipe network):'''
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::*Set to inlet elevation - node elevation: Sets the Ymax value to the inlet elevation minus the node elevation.
::*Use global option: Sets the Ymax value based on the parameters set in the 'Global Options' section.
:*'''Ysur:''' Set to 0.0 if using ponding. Otherwise, set to higher than expected depths to prevent flooding.
:*'''Area of ponding:''' Set to the approximate area of the 2D cells associated with the Inlet Usage connections layer(s).
<li>'''Nodes without a 2D connection (underground pipe network):'''
When a node is not connected to the 2D, flood losses will be lost from the model resulting in mass losses and inaccurate results. To prevent this, allow ponding (option 1) or make the surcharge depth high (option 2).
:*Option 1:▼
::*
::*
▲::*'''Area of ponding:''' Set to 0.0.
::*Area of ponding: Set to 0.0.
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