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Observed catchment surface runoff depth - SRG

While the Observed catchment runoff depth - SRG model allows the inclusion of an observed time series for runoff and uses a digital filter to separate the quick (surface flow) and slow flow (base flow) components, the Observed catchment surface runoff depth model assumes that all runoff in the time series is surface flow, and so quick flow is set equal to the observed flow, and slow flow is set to zero.



 An observed catchment runoff depth is applied to a functional unit (FU).

 The model can be used at hourly to annual time-steps.


 Principal developer

 Cooperative Research Centre for Catchment Hydrology. 


Source v4.3



Availability and conditions

The observed catchment surface runoff depth model is automatically installed with Source.


Input data


The model requires daily stream flow data converted to a runoff depth across the catchment (e.g. in mm).


The time series needs to be continuous (free of gaps) and preferably with a long period (10+ years) of record.


Selecting stream flow data to use in a river-basin scale simulation study needs information about the reliability of the data. It is best to use data which are most representative of the stream flow from the catchment. Observed data would normally be selected, except where the data are of poor quality or of unknown reliability.


Parameters or settings

No modeller specified parameters are required for this model.


Output data


The model outputs time series of quick flow and slow flow.   Note that results are converted from depths to volumes before being output by multiplying by the catchment area.