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What | pi-ratingCurves.xml |
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Description | Configuration for rating curves at specific locations |
schema location | http://fews.wldelft.nl/schemas/version1.0/pi-schemas/pi_ratingcurves.xsd |
Entry in ModuleDescriptors | <moduleDescriptor id="Transformation"> |
Rating Curves Configuration
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If a row doesn't include an offset element then the previous defined offset will be used.
powerEquation (Since
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2018.02)
A Power rating cuve function PowerEquation can be used as PI Rating Cuve cuve since Delft-FEWS version 2018.02. The parameters of this power rating curve are a bit different from the standard Power Delft-FEWS rating curve configured in the Region configuration.
The powerEquation uses the following equations:
The Power Equation is using the equation: discharge = cr * (stage - alpha)^ beta + Q0
stage = (discharge/cr)^(1/beta) + alpha
where ‘cr’ and ‘beta’ are rating curve constants, and ‘alpha’ ‘alpha’ is a constant which represents the stage corresponding to zero discharge and Q0 is optional shifting constant.
To show the stageToDischargePowerEquation rating curves in the TimeSeriesDisplay, a table is generated on the fly from the power equations.
For each equation ten stage values are generated using increment (max stage – min stage) /10 , and for each stage a discharge is computed. Please note that this table is only used in the display and not in TransformationModule computations.
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