Rating Curve
    • 21 Sep 2022
    • 1 Minute to read

    Rating Curve


    Article summary

    This unit specifies a rating curve at a given node. Its primary purpose is to allow water levels to be generated at Muskingum routing nodes.

    Theory and Guidance

    General

    This unit specifies a rating curve at a given node. Its primary purpose is to allow water levels to be generated at Muskingum routing nodes.

    This unit only gives information when required: it does not have any computation phase and can be placed anywhere in the data file. Basically, this unit is used when the flow is split at a rating junction, or when solving mixed reaches (those formed by combining hydrodynamic reaches solved by the full Saint Venant equations) and flood routing reaches.

    Usage

    To add a rating curve unit into your network, right-click on the network table and select 'insert' > 'rating curve', as shown below.

    RiverNodesimagesratingimage185.png

    Only one node is attached to this unit.

    Data

    Field in Data Entry Form

    Description

     Name in Datafile

    Node Label

    label of node at which rating curve is defined

    Label

    n/a

    number of q, h data pairs

    ndat

     Flow

    flow associated with water level hi (m3/s)

    qi

    Water Level

    water level at flow qi (mAD)

    hi

    Datafile Format

    General

    Line 1 : keyword 'QRATING' [comment]

    Line 2 : Label

    Line 3 : ndat

    Line 4 to Line 3+ndat : qi, hi

    where ndat is the number of data sets following, items in square brackets are optional, and other parameters are as defined in the data section.

    Example

    QRATING
    UNIT056
             4
         0.000     0.000
         1.000     0.100
         2.000     0.200
         3.000     0.300

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