A surge event is dependent on how long the UK's Meteorological Office Rainfall and Evaporation Calculation System ((https://www.metoffice.gov.uk/services/industry/data/specialist-datasets)
MORECS) remains at this maximum level.
The Met Office Rainfall and Evaporation Calculation System (
MORECS) has been designed for use in a range of areas that environmental officers may encounter on a daily basis.
Another useful service is
MORECS, which gives real-time assessments of rainfall, evaporation and soil moisture.