ADLib Glossary (Q to R)

More Information:

Rainfall, Climate, Meteorological Records and Weather Forecasts

Historical records of rainfall are used to predict the most rain that is likely to fall in a given time. Annual rainfall varies from less than 500 mm in the Thames estuary to more than 2400 mm over the uplands of Wales, Scotland and the Lake District. There is a similar increase from south East to North West in the total hours of measurable rainfall and in the number of rainy days.

Like rainfall, records are also kept by the Meteorological office of other climate factors such as the number of sunshine hours, maximum and minimum temperatures, wind speeds, wind direction, etc. The Meteorological Office also issue weather forecasts for both long and short term.

To design dirty water pumping systems, and storage systems you might need figures for rain lasting for short periods of time (1-3 hours) and medium periods of time (24 hours). How often such an event will occur on average is called the 'return period'. Figures for a return period of 5 years are normally used for design calculations.

You can get these figures from the Meteorological Office at Bracknell (Tel: 01344 420242).

ADLib logo Content provided by the Agricultural Document Library
© University of Hertfordshire, 2011