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<li>When prompted by QGIS, under 'Options', tick on 'Add layers to group', then select 'Add Layers' to open all layers within '''TS01_5m_001_swmm_check.gpkg'''. By default, all items in the available list should have been selected.
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{{Video|name=Animation_TS1_Check_01cAnimation_TS1_Check_01d.mp4|width=12351236}}<br>
<li>Review the '''Links--Conduits''', '''Nodes--JunctionsOutfalls''', '''Nodes--OutfallsStorage''' and '''Project--Options''' information to verify the data matches the input values that were entered. <br>
For a description of the attributes, refer to the SWMM Appendix of the <u>[https://docs.tuflow.com/classic-hpc/releasemanual/latest/2023-03-AD TUFLOW 2023-03-AD release notesManual]</u>.
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{{Video|name=Animation_TS1_Check_02cAnimation_TS1_Check_02d.mp4|width=12351236}}<br>
</ol>
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<li>The [[Check_Files_2d_grd | _grd_check_R]] is the 2D grid defined by the '''2d_code_M01_001_R''' layer and contains a region object for each cell. This is a useful check file to understand how the model is orientated and the 2D cell size in relation to the 2D hydraulic controls and 1D hydraulic structures. In this tutorial, the grid is orientated to align with the downstream road.
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{{Video|name=Animation_TS1_Check_03dAnimation_TS1_Check_03e.mp4|width=12351236}}<br>
<li>The [[Check_Files_1d_to_2d_bc | _1d_to_2d_check_R]] file shows the cells selected by the SX boundary links (these connect the 1D SWMM objects to 2D TUFLOW). It is recommended that the number of selected cells has at least the width (i.e. cell side length x number of cells) of the associated 1D culvert. In this case, each cell is 5m wide and each 2D linkage is 10m wide.
<li>Zoom to each structure to inspect the HX and SX connections to ensure the '''2d_bc_SWMM_Culvert_Connections_001_L''' layer is appropriate.
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{{Video|name=Animation_TS1_Check_04bAnimation_TS1_Check_04c.mp4|width=12351236}}<br>
</ol>
<br>
== Culvert FC04.1_C Stability ==
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.
<ol>
<li> '''Does the Node--Junction have sufficient 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.
</ol>
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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[[File:check_updated_2d_bc.png]]<br><br>
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