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  • Calculate the total rainfall for the storm details specified (6 hour, 100 year return period by default).
  • Calculate the PR as defined below (this is the same as the unit hydrograph method. Note that the rainfall used in the PR equation is based on the same details as the total rainfall above).

Storm Duration - Storms duration between 15 and 21600 minutes.

There is no option to add Climate Change or select between Winter and Summer storm profiles as these settings have no impact on the pre-development values.

Return Period - Storm return period between 1 and 1000 years.

Output Variables

PR (%)Total percentage run off of the catchment is defined as follows: