TUFLOW SWMM Tutorial M02 Check QGIS: Difference between revisions
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It can be useful to review the inp file created by TUFLOW after all inp files are combined.
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:*SWMM Input File (inp): Navigate to the '''TUFLOW\results''' folder and select '''TS02_5m_001_swmm.inp'''.
:*CRS for GeoPackage: Click the drop down menu and select ‘Project CRS: EPSG:32760 - WGS 84 / UTM zone 60S’.
:*SWMM Tags to ignore: leave blank.
:*GeoPackage output filename: Click the ... and select 'Save to File'. Navigate to the '''TUFLOW\check''' folder and set the GeoPackage output filename to '''TS02_5m_001_swmm_check.gpkg'''.
<li>Click 'Run'. Once the tool has finished, click 'Close'.
<li>In Windows File Explorer, navigate to the '''TUFLOW\check''' folder and drag and drop '''TS02_5m_001_swmm_check.gpkg''' into QGIS.
<li>When prompted by QGIS, under 'Options', tick on 'Add layers to group', then select 'Add Layers' to open all layers within '''TS02_5m_001_swmm_check.gpkg'''. By default, all items in the available list should have been selected.
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<li>Manual Data Review (Optional): Review the '''
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<li>Since the layers in '''TS02_5m_001_swmm_check.gpkg''' have been compared with the input layers, most of the input layers can be removed from the QGIS workspace. Remove all except the inlet usage layer, '''swmm_iu_TS02_001''', and the 2d_bc connections layer '''2d_bc_SWMM_Pipe_Network_Connections_001_L'''.
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<li>In the QGIS Layers Panel, move the '''TS02_5m_001_DEM_Z.tif''' layer below the other check files so that the other datasets are visible.
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Manual Data Review (Optional): Compare the 2D check files information against the the 1D check files to verify the model design is as intended.
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<li>How does the the pipe network invert elevations ('''
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== Inlet 1D/2D Connection Refinement ==
Currently, the underground stormwater pipe network inlets are set to use the 2D cell each inlet point is contained within for the connection to the 2D domain. This is often sufficient in many models, further refinement is however possible, particularly for on-grade inlets. On-grade inlets divert a portion of the flow going past an inlet into the pipe network based on a few factors, such as approach flow (the discharge flowing down the side of the roadway), velocity, and the inlet characteristics. To obtain an accurate estimation of the approach flow in the model, the 1D/2D connection cells must extend across the area conveying flow. Most urban areas have crowned roads, in this scenario the connected cells should extend to the center of the roadway. The geometry in this example model is simplified with flow generally only on one side of the street.
To check that on-grade inlets have a sufficient number of connected 2D cells:
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<li>In the QGIS Layers Panel, ensure '''swmm_iu_TS02_001''' is at the top of the list. This will ensure the data within this layer is displayed above all other layers in the project.
<li>Right click '''swmm_iu_TS02_001''' and select 'Properties'.
<li>In the 'Symbology' tab, click the top drop down menu and select 'Categorized'.
<li>To select the 'Value', click the drop down menu and select 'Placement'.
<li>Click 'Classify'. This will categorize the inlets in '''swmm_iu_TS02_001''' by their placement field and force each category to use a different color. There should be two categories: 'ON_GRADE' and 'ON_SAG'.
<li>Click 'Apply' and 'OK'.
<li>Ensure there are three 'ON_GRADE' inlets and nine 'ON_SAG' inlets.
<li>In the QGIS Layers Panel, right click '''Nodes--Junctions''' and select 'Show Labels'. This should indicate that the three on-grade inlets are 'Pit7', 'Pit9', and 'Pit15'.
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{{Video|name=Animation_TS2_Check_Inlet_01b.mp4|width=1236}}
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<li>Use the '''TS02_5m_001_1d_to_2d_check_R''' layer to compare the width of the 1D/2D connection cells with the roadway widths in the DEM. It should be clear that the cells cover less than half of the roadways and may not represent the full flow-width that we are interested in.
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There are two approaches to connect an inlet to multiple cells:
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<li>Within the inlet usage layer, '''swmm_iu_TS02_001''', the number of connected cells is determined by the 'Conn_width' field. Increasing the connection width will select multiple cells. Note that a negative value will specify an exact number of cells regardless of the cell size. The default approach for selecting additional cells depends on whether the inlet is on-grade or on-sag. The details of the algorithm can be found in the <u>[https://www.tuflow.com/downloads/#tuflow TUFLOW Manual]</u>.
<li>Manually specify the cells to connect using an SX connection (polyline or polygon) and CN line to the inlet location. Note this method requires removing the 'Conn1D_2D' attribute from the inlet usage layer.
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For this model, the first option (increasing the number of cells) will be used for 'Pit9', and the second option (create manual connections) will be used for 'Pit7' and 'Pit15'.
:'''Note:''' When using the automatic method, the actual 1D/2D connected cells should be verified.
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Make the following changes to the inlet usage layer:
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<li>In the QGIS Layers Panel, select (left click) '''swmm_iu_TS02_001''' and toggle on editing.
<li>Use the 'Select Features' tool to highlight the inlets on the junction nodes, 'Pit7' and 'Pit15' (hold Shift to select multiple).
<li>Right click '''swmm_iu_TS02_001''' and select 'Open Attribute Table'.
<li>Clear the 'Conn1D_2D' attributes for the inlets representing 'Pit7' and 'Pit15'.
<li>For the inlet associated with 'Pit9', specify a value of -2 for the 'Conn_width'. This will connect the inlet to exactly two cells regardless of the cell size.
<li>Turn off editing to save the edits.
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{{Video|name=Animation_TS2_Check_Inlet_03b.mp4|width=1236}}
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Next, the manual connections for 'Pit7' and 'Pit15' must be added. To save time, a 2d_bc layer with these connections has been provided.
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<li>If the QGIS Browser Panel is not already open, right click anywhere in the QGIS Toolbar Panel and tick on 'Browser Panel' from the 'Panels' options.
<li>In the QGIS Browser Panel, in the 'Project Home' directory, navigate to the '''TUFLOW_SWMM_Module_02\Tutorial_Data''' folder.
<li>Drag the '''2d_bc_SWMM_Inlet_Connections_001_L''' layer from the '''Urban_Development.gpkg''' and drop it into the '''TS02_001.gpkg''' contained within the '''TUFLOW_SWMM_Module_02\TUFLOW\model\gis''' folder.
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{{Video|name=Animation_TS2_Check_Inlet_04b.mp4|width=1236}}
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Update the TBC:
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<li>Navigate to the '''TUFLOW\model''' folder and open ''' TS02_001.tbc''' in Notepad++.
<li>Add the following command to the end of the file:
:<font color="blue"><tt>Read GIS BC</tt></font> <font color="red"><tt>== </tt></font> <font color="black"><tt>2d_bc_SWMM_Inlet_Connections_001_L</tt></font> <font color="green"><tt> ! Reference the TUFLOW BC File</tt></font><br>
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Rerun the model and review the check files to verify that the on-grade inlets are now connected to multiple cells.
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<li>A Flow Trace window will appear. It provides a 'long plot' of the long sections of the various upstream paths from the selected conduit, highlighting the areas of continuity failures. The plot should be consistent with the output GIS layer that is also generated by the flow trace tool.
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