Junction
    • 08 Aug 2022
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    Junction

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    Article Summary

    The Junction unit is applied at the division of a single channel into several channels or the confluence of many channels into one. It may also be used to connect an open channel directly to a conduit if entry and exit losses are insignificant. It may also be used when adding bypass/overspill structures or adding structures in parallel.

    Data

    Field in Data Entry Form

    Description

    Name in Datafile

     Node 1

    First connecting node name

    Label1

     Node 2

    Second connecting node name

    Label2

    Theory and Guidance

    The Junction models an open channel junction.

    The Junction is applied at the division of a single channel into several channels or the confluence of many channels into one or both. It may also be used where structures in parallel or bypass/overspill structures are being modelled. The Junction may also be used to connect an open channel directly to a conduit if entry and exit losses are insignificant.

    Equations

    The equations used to model junctions are flow continuity:

    Q1 + Q2 + Q3 + .... = 0

    (1)

    and equality of water surface level:

    h1 = h2 = h3 ....

    (2)

    General

    Junctions must not be connected to other junctions or reservoirs.

    Bifurcating junction outflows may be connected to Abstractions. The abstractions typically define logical rules to govern the split of flow.

    Datafile Format

    Line 1 - Keyword 'JUNCTION' [comment]

    Line 2 - Keyword 'OPEN'

    Line 3 - Labels for the junction (two or more)

    RiverNodesimagesJunctionData.gif



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