How do we measure rainfall? VIDEOGRAPHIC
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00:00How do we measure rainfall?
00:07Rainfall is measured in millimetres.
00:09One millimetre of rainfall on a square metre is the equivalent of one litre of rainwater.
00:15At 935 millimetres of rainfall per year, you are in France.
00:21At 100 millimetres per year, the Gobi Desert, and with 11,000 millimetres per year at Cherrapunji
00:28in India during the monsoon.
00:30To measure rainfall, we use rain gauges.
00:33There are different types, including funnel, tipping bucket and the weighing rain gauge.
00:37They must be positioned in an open area away from any obstacles and one to two metres above
00:43the ground.
00:44To measure the rain on an area, a network of measuring stations is required.
00:49The more stations, the more accurate the measurement.
00:51This data serves agriculture, water management and weather models used to make forecasts.