The Urban Outfall Node
    • 26 Aug 2022
    • 2 Minutes to read
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    The Urban Outfall Node

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    Article summary

    Outfall nodes are downstream boundaries for the network in the case of Dynamic Wave routing. For the other versions of the solver, Outfall nodes will behave in the same way to Urban Junction Nodes.

    External Urban Inflow can enter the system at Outfalls. Outflow from an Outfall can either be lost from the system, or routed onto an Urban Subcatchment Node.

    UrbanNodesimagesurbanoutfall.PNG

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    Rules of Outfall nodes

    Only a single inflow Conduit Link can be connected to an Outfall node. No outflow pipes (links) can be connected to an Outfall node.


    Outfall label/name

    The Outfall node name by default will be provided by parameters setup in the Urban Model Defaults menu.


    Coordinates

    The x and y coordinates of the Outfall node are shown in these fields. These values are automatically populated based on the node location on the map.


    Optional descriptors

    Description

    This field allows for an optional text description. The field will be blank by default.

    Tag

    This field allows for an optional text tag, to allow you to categorise units. The field will be blank by default.


    Inflows

    External inflows can be optionally specified for Outfall nodes.


    Treatment

    Addition of pollutants is not currently available within the software. If your model already contains defined pollutants, these will be unaffected, however you will not be able to access the pollutant editor form.


    General node parameters

    Invert elevation

    The invert elevation of the Outfall is provided in this field. By default this value will be provided by parameter setup in the Urban Model Defaults menu.

    Tide Gate

    This will incorporate a flapped gate on the outfall, preventing backflow. The option is set to NO by default.

    Route To

    This option allows for the outfall to discharge onto a subcatchment (i.e. a specified Urban Subcatchment Node). The field is blank by default.

    Type

    This specifies the boundary condition (specifically, the stage) in the Outfall node:

    FREE - the stage will be determined by the minimum of the critical and normal flow depths in the connecting conduit. This is the default and requires no further parameters to be specified.

    NORMAL - the stage will be determined by the normal flow depth in the connecting conduit. This option requires no further parameters to be specified.

    FIXED - sets the outfall stage to a fixed value, in which case the value must be provided in the Fixed Outfall : Fixed Stage field.

    TIDAL - sets the outfall stage to a table of tide elevation (against time of day) data, in which case this data must be provided in the Tidal Outfall : Curve Name field.

    TIMESERIES - sets the outfall stage to a timeseries of stage data, in which case this data must be provided in the Time Series Outfall : Series Name field.


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