Working with Flow-Divider nodes
- 03 Aug 2022
- 2 Minutes to read
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Working with Flow-Divider nodes
- Updated on 03 Aug 2022
- 2 Minutes to read
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The Flow-Divider node is identical to the urban Junction node aside from the specification of diverted flow. In the case of Dynamic Wave routing, Flow-Divider nodes will be treated as Junction nodes. When entering Divider node properties, everything is again identical to the Junction node, aside from some additional parameters to specify the division of flow.
The lower half of the Divider node Properties Window is shown below.
All parameters in the top of the form are identical to Junction nodes.
It is necessary to specify a Diverted Link. The Flow-Divider node will divide the flow between the two outflow links connected from it. One of these outflow links is specified in this field to determine how this divide occurs. Let's refer to these two outflow links as PipeA and PipeB.
If PipeA should receive all flow until a known value F is reached, at which point PipeB should be start receiving flow, enter the label for PipeB in the Diverted Link field. Leave Type as the default value CUTOFF, and in the Cutoff Flow field, enter the value **F.
If PipeA should receive all flow until its capacity is reached, at which point PipeB should be start receiving flow, enter the label for PipeB in the Diverted Link field, and adjust Type to OVERFLOW using the drop-down on the left. No other parameters are needed for this case.
If the diverted flow going to PipeB is dependent on the total flow, enter the label for PipeB in the Diverted Link field, and adjust Type to TABULAR using the drop-down on the left. In the Curve Name field, double-click to open the Curve Editor. This opens in a new window and contains a table to define the relationship between the diverted flow and the total flow. Tips for defining curves are provided below.
Finally, if the diverted flow going to PipeB would be most accurately computed using a weir equation, enter the label for PipeB in the Diverted Link field, and adjust Type to WEIR using the drop-down on the left.
The Minimum flow field, Maximum depth field and Coefficient field will all contain zeros by default. To edit these values, click in the field, type a new value, then press the Enter key on your keyboard.
Top Tips to Define Curves
If no curve is defined and the field is shown blank, we recommend double-clicking the field to open the Curve Editor and entering a name for your curve, alongside the data required. It is also possible to name your curve in the field initially before double-clicking on this name, however the name then must be provided a second time in the Curve Editor window.
If you have previously defined a curve (and so a curve name is provided in the field), you can double-click the name to edit the details.
If you would like to define a new curve whilst retaining the previous curve, click in the field and use the Backspace key to delete the name so the field is blank. Then double-click to enter the Curve Editor, and enter your curve details (with a new name!) When you return to the Divider node properties, you will now notice your previous curve and new curve are both available from the drop-down.
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