Catchment Rainfall Statistics and Spatial Distribution
Mean Annual Rainfall
The mean annual rainfall over the catchment in millimetres. Generally the mean relates to the given period of record (rainfall data preceding the start of the corresponding river flow record are ignored). The mean annual rainfall is derived from the daily catchment rainfall series held on the National River Flow Archive. The mean annual rainfall is computed from the daily mean rainfalls using data only for years where the monthly rainfall record is complete.
1961-1990 Rainfall Statistic
The average annual rainfall over the catchment for 1961–1990. This statistic is derived from the Standard-period Average Annual Rainfall (SAAR) map for 1961-1990, a 1km grid based on data from the Met Office, rather than a catchment rainfall series.
1961-1990 Rainfall Distribution
Spatial representations of average rainfall across catchments are derived from the Standard-period Average Annual Rainfall (SAAR) map for 1961-1990, a 1km grid based on data from the Met Office.
