Difference between revisions of "XPSWMM Conversion Reconfigure SWMM Junctions Development"

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== Bulk Update SWMM Nodes--Junctions Attributes ==
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== Update SWMM Nodes--Junctions Attributes ==
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The following GIS feature updates to the '''Nodes--Junctions''' attributes will finalize the SWMM portion of the TUFLOW model. This is typically the final step in the model building process, as the recommended attributes for a junction node vary depending on whether the node is associated with inlet usage connections, 1D/2D culvert connections, and SWMM hydrology sub-catchments.  
+
The following GIS feature updates to the '''Nodes--Junctions''' attributes will finalize the SWMM portion of the TUFLOW model. This is typically the final step in the model building process, as the recommended attributes for a junction node vary depending on whether the node is associated with inlet usage connections, 1D/2D culvert connections, and SWMM hydrology sub-catchments.
 +
 
 +
The recommended configuration for TUFLOW-SWMM junctions uses ponding everywhere and allows SWMM to pond as soon as the water level reaches the highest obvert (ceiling) of the connected conduits. However, this configuration may produce different results compared to the source XPSWMM model especially for deeply buried pipe networks.
 +
 
 +
Whether you want to use XPSWMM compatible attributes, or the recommended attributes should be determined based on how strictly the results need to match previous results and may require client consultation. It is generally recommended to run both configurations to compare between them and the XPSWMM results.
 +
 
 +
For a summary of the attributes associated with the '''Nodes--Junctions''' layer, refer to <u>[https://docs.tuflow.com/classic-hpc/release/2023-03-AD/SWMM-Input-Detailed-1.html#tab:tab-SWMM-Input-Junctions TUFLOW 2023-03-AD Release Notes (Table A.30)]</u> and the <u>[https://downloads.tuflow.com/SWMM/SWMM5_Reference_Manual_Volume2_Hydaulics_P100S9AS.pdf SWMM Reference Manual - Volume 2 (Hydraulics)]</u>.
 +
<br>
 +
 
 +
=== Nodes--Junctions Attributes XPSWMM Compatible Options ===
 +
The XPSWMM compatible options leave the maximum depth (Ymax) set by the XPSWMM model which uses the inlet elevation minus the node invert elevation. This approach represents little to no storage between the top of the adjacent conduits and the inlet (ground elevation) which may lead to instabilities. The instabilities may not be identified unless you turn the output interval very small (say 5 seconds) but such oscillations can lead to mass errors and errors in the hydraulic results.
  
 
<ol>
 
<ol>
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:::* Nodes receiving subcatchment flows option (if connected to 2D): 'Based on options selected below'
 
:::* Nodes receiving subcatchment flows option (if connected to 2D): 'Based on options selected below'
 
:* Nodes connected to 2D without Inlets (through embankment culvert):
 
:* Nodes connected to 2D without Inlets (through embankment culvert):
 +
:::* Leave as-is (all of these were converted to storage nodes)
 +
:* Nodes connected to 2D with Inlets (underground pipe network):
 +
:::* Maximum depth (Ymax) option: 'Use global option' to leave settings from XPSWMM
 
:::* Ysur: 0
 
:::* Ysur: 0
−
:::* Area of ponding: This value should match the 2D cell area associated with 1D/2D culvert connections (100 in the example dataset).
+
:::* Area of ponding: This value should match the 2D cell area associated with the Inlet Usage connections (25 in the example model).
 +
:* Nodes without 2D Connection (underground pipe network):
 +
:::* Surcharge Depth: This value should be a value higher than any expected water level in the model (99 in the example model).
 +
:::* Area of ponding: 0
 +
 
 +
<li>Select 'Modify All Features'. Once the tool has finished, click 'Close'.
 +
<li>Turn off editing to save the edits.
 +
<li>View the attributes within '''Nodes--Junctions''' to verify the data processing has been completed correctly. <br>
 +
</ol>
 +
<br>
 +
 
 +
=== Nodes--Junctions Attributes Recommended Options ===
 +
The recommended junction attributes use a maximum depth (Ymax) of 0.0 for all nodes. Ponding is recommended at all nodes connected to the 2D domain. For nodes not connected to the 2D domain, ponding or the use of a high-surcharge value are both valid options. The use of a Ymax of 0.0 and ponding for nodes connected to the 2D domain, ensures storage is represented between the top of adjacent pipes to the ground elevation which greatly stabilizes model simulations and allows water levels in the node between those elevations.
 +
 
 +
<ol>
 +
<li> In the Processing Toolbox, select the 'Edit Features In-Place' tool. This allows the editing of an existing layer, instead of the creation of a new layer.
 +
<li> Go to TUFLOW >> SWMM in the processing tool list and select the '<u>[[QGIS_SWMM_Junctions_Set_Attributes |Junctions - Set attributes]]</u>' processing tool. This opens the dialog shown below.
 +
:* Input Subcatchment layers: Not needed because the attributes will not be dependent on whether this connection exists.
 +
:* Input Inlet Usage Layers: If available, select the inlet usage layer (e.g. '''swmm_iu_XP_001''').
 +
:* Input BC Connection Layers: If available, select the 2d_bc connection layer (e.g. '''1D2D_Urban_001_2d_bc_L''').
 +
:* General Options:
 +
:::* Maximum Depth Option (Ymax): 'Set to 0'
 +
:::* Nodes receiving subcatchment flows option (if connected to 2D): 'Based on options selected below'
 +
:* Nodes connected to 2D without Inlets (through embankment culvert):
 +
:::* Leave as-is (all of these were converted to storage nodes)
 
:* Nodes connected to 2D with Inlets (underground pipe network):
 
:* Nodes connected to 2D with Inlets (underground pipe network):
−
:::* Maximum depth (Ymax) option: 'Use global option'
+
:::* Maximum depth (Ymax) option: 'Use global option' to set to 0
 
:::* Ysur: 0
 
:::* Ysur: 0
 
:::* Area of ponding: This value should match the 2D cell area associated with the Inlet Usage connections (25 in the example model).
 
:::* Area of ponding: This value should match the 2D cell area associated with the Inlet Usage connections (25 in the example model).
 
:* Nodes without 2D Connection (underground pipe network):
 
:* Nodes without 2D Connection (underground pipe network):
 
:::* Surcharge Depth: This value should be a value higher than any expected water level in the model (99 in the example model).
 
:::* Surcharge Depth: This value should be a value higher than any expected water level in the model (99 in the example model).
−
:::* Area of ponding: 1
+
:::* Area of ponding: 0
  
 
<li>Select 'Modify All Features'. Once the tool has finished, click 'Close'.
 
<li>Select 'Modify All Features'. Once the tool has finished, click 'Close'.
 
<li>Turn off editing to save the edits.
 
<li>Turn off editing to save the edits.
 
<li>View the attributes within '''Nodes--Junctions''' to verify the data processing has been completed correctly. <br>
 
<li>View the attributes within '''Nodes--Junctions''' to verify the data processing has been completed correctly. <br>
−
For a summary of the attributes associated with the '''Nodes--Junctions''' layer, refer to <u>[https://docs.tuflow.com/classic-hpc/release/2023-03-AD/SWMM-Input-Detailed-1.html#tab:tab-SWMM-Input-Junctions TUFLOW 2023-03-AD Release Notes (Table A.30)]</u> and the <u>[https://downloads.tuflow.com/SWMM/SWMM5_Reference_Manual_Volume2_Hydaulics_P100S9AS.pdf SWMM Reference Manual - Volume 2 (Hydraulics)]</u>.
+
</ol>
−
<br><br>
 
 
{{Video|name=Animation_XPtoTUFLOW_1D_model_13a.mp4|width=1350}}
 
{{Video|name=Animation_XPtoTUFLOW_1D_model_13a.mp4|width=1350}}
 
<br>
 
<br>
−
</ol>
 
  
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== Selectively Update SWMM Nodes--Junctions Attributes ==
 
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The final step in setting the '''Nodes--Junctions''' attributes requires updating the Ymax (maximum depth) attribute to zero (0) for the nodes within '''Nodes--Junctions''' that are <u>'''not'''</u> connected to the 2D surface via a Pipe Network Pit (Inlet Usage) connection point. Setting the value to zero adjusts the junction node's Ymax to match the distance from its invert to the top of the highest connecting link. <br>
 
−
<br>
 
−
We can implement this update using a point selection workflow similar to the one described in the '<u>[[XPSWMM_Conversion_Reconfigure_SWMM_Pipe_Network_Data |Correct the SWMM Nodes--Junction/Outfall Model Design]]</u>' section.
 
−
<ol>
 
−
<li> In the QGIS Layers panel, select (left click) '''Nodes--Junctions''' and toggle on editing.
 
−
<li> Use the 'Select Features' tool to select all nodes included in the '''Nodes--Junctions''' layer. When selected, this will change their color to bright yellow.
 
−
<li> In the Processing Toolbox, go to 'Vector Selection' and select 'Select within distance'. This opens the dialog shown below.
 
−
:* Select features from: '''Nodes--Junctions''' (this is prepopulated as '''Nodes--Junctions''' is the active dataset).
 
−
:* By comparing to the features from: Click the dropdown menu and select the inlet usage layer (e.g. '''swmm_iu_XP_001''').
 
−
:* Where the features are within: '0.1 meters'.
 
−
:* Modify current selection by: 'removing from current selection'.
 
−
<li> Click 'Run'. Once the tool is finished, click 'Close'.
 
−
<li> In the QGIS Layers panel, right click '''Nodes--Junctions''' and select 'Open Attribute Table'.
 
−
<li> In the attribute table, only some of the junction nodes will be selected. To update the Ymax for the selected nodes:
 
−
<ol>
 
−
<li> Set the target update column to '''Ymax'''.
 
−
<li> In the expression box, set the update value to '''0'''.
 
−
<li> Click 'Update Selected'.
 
−
</ol>
 
−
<li> Close the attribute table.
 
−
<li> Toggle editing off to save the edits to '''Nodes--Junctions'''.
 
−
<br><br>
 
−
{{Video|name=Animation_XPtoTUFLOW_1D_model_14b.mp4|width=1350}}
 
−
<br>
 
−
</ol>
 
−
For the provided example dataset, the above workflow should have updated the Ymax value for the junction nodes highlighted red in the image below.<br><br>
 
−
[[File: XPSWMM_to_TUFLOW_set_junctions_attributes_01a.png]]<br>
 
  
 
== Save the QGIS Workspace ==
 
== Save the QGIS Workspace ==

Latest revision as of 05:31, 20 April 2024

Update SWMM Nodes--Junctions Attributes

The following GIS feature updates to the Nodes--Junctions attributes will finalize the SWMM portion of the TUFLOW model. This is typically the final step in the model building process, as the recommended attributes for a junction node vary depending on whether the node is associated with inlet usage connections, 1D/2D culvert connections, and SWMM hydrology sub-catchments.

The recommended configuration for TUFLOW-SWMM junctions uses ponding everywhere and allows SWMM to pond as soon as the water level reaches the highest obvert (ceiling) of the connected conduits. However, this configuration may produce different results compared to the source XPSWMM model especially for deeply buried pipe networks.

Whether you want to use XPSWMM compatible attributes, or the recommended attributes should be determined based on how strictly the results need to match previous results and may require client consultation. It is generally recommended to run both configurations to compare between them and the XPSWMM results.

For a summary of the attributes associated with the Nodes--Junctions layer, refer to TUFLOW 2023-03-AD Release Notes (Table A.30) and the SWMM Reference Manual - Volume 2 (Hydraulics).

Nodes--Junctions Attributes XPSWMM Compatible Options

The XPSWMM compatible options leave the maximum depth (Ymax) set by the XPSWMM model which uses the inlet elevation minus the node invert elevation. This approach represents little to no storage between the top of the adjacent conduits and the inlet (ground elevation) which may lead to instabilities. The instabilities may not be identified unless you turn the output interval very small (say 5 seconds) but such oscillations can lead to mass errors and errors in the hydraulic results.

  1. In the Processing Toolbox, select the 'Edit Features In-Place' tool. This allows the editing of an existing layer, instead of the creation of a new layer.
  2. Go to TUFLOW >> SWMM in the processing tool list and select the 'Junctions - Set attributes' processing tool. This opens the dialog shown below.
    • Input Subcatchment layers: If available, select Hydrology--Subcatchments.
    • Input Inlet Usage Layers: If available, select the inlet usage layer (e.g. swmm_iu_XP_001).
    • Input BC Connection Layers: If available, select the 2d_bc connection layer (e.g. 1D2D_Urban_001_2d_bc_L).
    • General Options:
    • Maximum Depth Option (Ymax): 'Leave as is (applies to edit in place only)'
    • Nodes receiving subcatchment flows option (if connected to 2D): 'Based on options selected below'
    • Nodes connected to 2D without Inlets (through embankment culvert):
    • Leave as-is (all of these were converted to storage nodes)
    • Nodes connected to 2D with Inlets (underground pipe network):
    • Maximum depth (Ymax) option: 'Use global option' to leave settings from XPSWMM
    • Ysur: 0
    • Area of ponding: This value should match the 2D cell area associated with the Inlet Usage connections (25 in the example model).
    • Nodes without 2D Connection (underground pipe network):
    • Surcharge Depth: This value should be a value higher than any expected water level in the model (99 in the example model).
    • Area of ponding: 0
  3. Select 'Modify All Features'. Once the tool has finished, click 'Close'.
  4. Turn off editing to save the edits.
  5. View the attributes within Nodes--Junctions to verify the data processing has been completed correctly.


Nodes--Junctions Attributes Recommended Options

The recommended junction attributes use a maximum depth (Ymax) of 0.0 for all nodes. Ponding is recommended at all nodes connected to the 2D domain. For nodes not connected to the 2D domain, ponding or the use of a high-surcharge value are both valid options. The use of a Ymax of 0.0 and ponding for nodes connected to the 2D domain, ensures storage is represented between the top of adjacent pipes to the ground elevation which greatly stabilizes model simulations and allows water levels in the node between those elevations.

  1. In the Processing Toolbox, select the 'Edit Features In-Place' tool. This allows the editing of an existing layer, instead of the creation of a new layer.
  2. Go to TUFLOW >> SWMM in the processing tool list and select the 'Junctions - Set attributes' processing tool. This opens the dialog shown below.
    • Input Subcatchment layers: Not needed because the attributes will not be dependent on whether this connection exists.
    • Input Inlet Usage Layers: If available, select the inlet usage layer (e.g. swmm_iu_XP_001).
    • Input BC Connection Layers: If available, select the 2d_bc connection layer (e.g. 1D2D_Urban_001_2d_bc_L).
    • General Options:
    • Maximum Depth Option (Ymax): 'Set to 0'
    • Nodes receiving subcatchment flows option (if connected to 2D): 'Based on options selected below'
    • Nodes connected to 2D without Inlets (through embankment culvert):
    • Leave as-is (all of these were converted to storage nodes)
    • Nodes connected to 2D with Inlets (underground pipe network):
    • Maximum depth (Ymax) option: 'Use global option' to set to 0
    • Ysur: 0
    • Area of ponding: This value should match the 2D cell area associated with the Inlet Usage connections (25 in the example model).
    • Nodes without 2D Connection (underground pipe network):
    • Surcharge Depth: This value should be a value higher than any expected water level in the model (99 in the example model).
    • Area of ponding: 0
  3. Select 'Modify All Features'. Once the tool has finished, click 'Close'.
  4. Turn off editing to save the edits.
  5. View the attributes within Nodes--Junctions to verify the data processing has been completed correctly.



Save the QGIS Workspace

In preparation for the next steps of the conversion process, ensure your QGIS workspace has been saved.

  1. In QGIS, go to Project > Save from the top dropdown menu options.



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