Information
Transformation: |
MeanDischargeVolume |
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Transformation Group: |
Events |
Description: |
Calculates the mean discharge volume of events initiated in the output period per event initiated in the output period. An event in this transformation is defined as a the largest possible series of subsequent subevents where the duration of gaps (where there are no subevents) is shorter than the specified maxGapDuration parameter. A subevent is defined as a measurement in time in the input where the value is larger than the specified threshold parameter. The discharge volume of a subevent is calculated by multiplying the input value (m3/s) by the duration of the input time step. The discharge volume for an event is the sum of the discharge volumes for its subevents, and is registered only in the output period where the event initiated. |
Hydrological Information
Purpose and use of Transformation: |
This transformation can for instance be used to report the mean discharge volume per event on sewer spillage for each month. |
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Background and Exceptions: |
The unit of the input must be m3/s. The output time step must be bigger than the input time step. All input values must be non-missings, otherwise the result will be set to missing value. In case one of the inputs is doubtful, the output flag is set to ORIGINAL_DOUBTFUL. |
Input
discharge Equidistant measurements in m3/s.
Options
threshold Only measurements are used with a value above this value. Default is 0.
maxGapDuration When there is a gap between two subsequent subevents exceeding this duration, these subevents belong to two separate events. Default is 24 hours.
CoefficientSets
No connection to CoefficientSets.
Output
meanVolume Mean volume per event of the selected events in m3.
Configuration Example
Configuration example for calculation of the mean discharge volume per event for each month.
<?xml version="1.0" encoding="UTF-8"?>
<transformationModule version="1.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://www.wldelft.nl/fews"
xsi:schemaLocation="http://www.wldelft.nl/fews http://fews.wldelft.nl/schemas/version1.0/transformationModule.xsd">
<!-- input variables -->
<!-- output variables -->
<!-- transformations -->
<transformation id="events dischargeMeanVolume">
<events>
<dischargeMeanVolume>
<discharge>
<timeSeriesSet>
<moduleInstanceId>EventsDischargeMeanVolume</moduleInstanceId>
<valueType>scalar</valueType>
<parameterId>Q.dis</parameterId>
<locationId>H-2001</locationId>
<timeSeriesType>external historical</timeSeriesType>
<timeStep unit="hour" multiplier="6"/>
<relativeViewPeriod unit="day" start="0" end="113"/>
<readWriteMode>editing visible to all future task runs</readWriteMode>
</timeSeriesSet>
</discharge>
<meanVolume>
<timeSeriesSet>
<moduleInstanceId>EventsDischargeMeanVolume</moduleInstanceId>
<valueType>scalar</valueType>
<parameterId>Q.arg</parameterId>
<locationId>H-2001</locationId>
<timeSeriesType>external historical</timeSeriesType>
<timeStep monthDays="--01-01 --02-01 --03-01 --04-01 --05-01 --06-01 --07-01 --08-01 --09-01 --10-01 --11-01 --12-01" />
<relativeViewPeriod unit="day" start="0" end="113"/>
<readWriteMode>add originals</readWriteMode>
</timeSeriesSet>
</meanVolume>
</dischargeMeanVolume>
</events>
</transformation>
</transformationModule>
