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Transformation: | Duration |
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Transformation Group: | Events |
Description: | Calculates either the net duration or the gross duration of the events initiated in the output period. An event in this transformation is defined as a series of subsequent subevents where the duration of gaps where there are no subevents is smaller 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 duration of a single subevent is equal to the duration of the input time step. The duration of an event is the sum of the duration of its subevents, and is registered only in the output period where the event initiated. |
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Purpose and use of Transformation: | This transformation can for instance be used to report discharge volume statistics on the duration of sewer spillage events for each month. |
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Background and Exceptions: | The input must be m3/sper second. 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 input Equidistant measurements in units per second (for instance m3/s).
Options
eventSelection Selects either discharge volume of all events or only the discharge volume of the event with the largest discharge volume.
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. In order to calculate the net duration instead of the gross duration, this value has to be set to zero.
outputTimeUnit Defines the time unit of the output (default day).
CoefficientSets
No connection to CoefficientSets.
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