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QGIS SWMM Conduits Assign Losses: Difference between revisions

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== Introduction ==
This tool createsgenerates loss geometry and attributes for a SWMM conduit layer. Losses are dependent uponon whether a conduit is the furthest upstream, furthest downstream, and which nodes are connected to inlets. Upstream entrance losses are assigned to the furthest upstream channels where the upstream node is <u>not</u> connected to an inlet, and other entrance losses are assigned to all other conduits (may be 0.0). Downstream exit losses are assigned to the furthest downstream channels where the downstream node is <u>not</u> connected to an inlet, and other exit losses are assigned to the rest of the channels (may be 0.0). This tool creates entrance and exit losses specified by the user throughout the domain. Channels that experience atypical size changes may need higher or lower loss coefficients.<br>
 
This tool supports in-place editing if selected in the QGIS processing window.<br><br>
'''Note:''' This tool relies on the "From Node" and "To Node" fields to determine position in the network. The <u>[[QGIS SWMM Conduits Assign Node Fields|Conduits - Assign node fields]]</u> processing tool will ensure the "From Node" and "To Node" fields are correctly assigned.▼
 
▲'''Note:''' This tool relies on the "From Node" and "To Node" fields to determine the position in the network. The <u>[[QGIS SWMM Conduits Assign Node Fields|Conduits - Assign node fields]]</u> processing tool will ensure the "From Node" and "To Node" fields are correctly assigned.
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=== Parameters ===
This tool populates the 'losses_Kentry', losses_Kexit', and 'losses_Kavg' fields of the input conduit layer. The 'losses_Kentry' and losses_Kexit' fields are determined by the input parameters below. The 'losses_Kavg' field is set to 0.0,; however if the field is already populated, the tool will not override the existing value.
<ol>
<li>'''Input layer:''' The existing conduits layer thatto will be assignedwhich the losses fields will be assigned.
<li>'''Selected features only:''' If channel(s) in the conduits layer have been selected using the 'Select Features' tool, this option will become available. If this is checked on, the tool will only assign losses fields forto the channelsselected that have been selectedchannel(s).
<li>'''Input inlet usage features [optional]:''' The layer containing the physical location of inlets and site specific geometry.
<li>'''Culvert opening:'''
<li>'''Entrance loss furthest upstream channels:''' The data to populate the 'losses_Kentry' field for the furthest upstream conduits features. ▼
<li>''':*Entrance loss for channels not furthest upstreamLoss:''' The data to populate the 'losses_Kentry' field for the otherfurthest upstream conduits' features. Default value is 0.5.
<li>'''Culvert or pipe network outlet:'''
<li>'''Exit loss furthest downstream channels:''' The data to populate the 'losses_Kexit' field for the furthest downstream conduits features.▼
<li>''':*Exit loss for channels not furthest downstream:''' The data to populate the 'losses_Kexit' field for the otherfurthest downstream conduits' features. Default value is 1.0.
<li>'''Pipe network (manholes and pit inlets):'''
<li>'''Conduits:''' Determines the filename and location of the output conduits layer.▼
▲<li>''':*Entrance loss furthest upstream channels:''' The data to populate the 'losses_Kentry' field for the furthestother upstream conduits' features. Default value is 0.2.
▲<li>''':*Exit loss furthest downstream channels:''' The data to populate the 'losses_Kexit' field for the furthestother downstream conduits' features. Default value is 0.4.
▲<li>'''ConduitsOutput conduits:''' Determines the filename and location of the output conduits layer.
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'''Note:''' If 'Edit Feature In-Place' is selected, the tool does not require the 'Input layer' or the 'Conduits' parameters, as the tool will override the existing junctionsconduits file with the updated attributes.
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[[File:Conduits_Assign_Losses_Dialog_01aConduits_Assign_Losses_Dialog_01b.png]]
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== Example ==
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{{Video|name=Animation_Conduits_Assign_losses_01bAnimation_Conduits_Assign_Losses_01d.mp4|width=12351236}}
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Using the 'Edit FeaturesFeature In -Place' Tooltool:
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{{Video|name=Animation_Conduits_Assign_losses_02aAnimation_Conduits_Assign_Losses_02d.mp4|width=12351236}}
 
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