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TUFLOW SWMM Tutorial M01 Check QGIS: Difference between revisions

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The model result review section identified a minor model instability at culvert FC04.1_C. When working to resolve embankment culvert instabilities, there are typically two model features that require consideration.
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<li> '''Does the Node--Junction have suffecientsufficient storage defined (Apond attribute)?''' The SWMM Apond value should be roughly be the same as the area of the connected 2D cells. A larger value my help stability, though a value that is too large may attenuate flows. Generally, a value up to 5 times the 2D cell connection area will not cause issue. In this instance, the Apond value is set to 50m^2. This value is appropriate.
<li> '''Are an appropriate number of 2D cells selected for the 1D/2D connection?''' The width of the connected 2D cells should be equal to or greater than the width of the 1D SWMM culvert. Connecting to too many 2D cells can also cause issues. In this case FC04.1_C is 3 x 1.2 diameter circular culverts. Collectively, the culvert bank width is 3.6m. Since our 2D cell size is 5m, ideally these culverts should be linked to a single 2D cell.
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Use the [[Check_Files_1d_to_2d_bc | _1d_to_2d_check_R]] file to help guide the update of '''2d_bc_SWMM_Culvert_Connections_001_L''' so the connection lines only select a single 2D cell upstream and downstream of the culvert. This change will resolve the stability issue.
 
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