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"Changing the rainfall chart is a real challenge in a heavy downpour.
"You have to tackle a slippery and muddy lawn, an umbrella flipped over by the wind and the smeared ink on a soaked rainfall chart at the same time," he recounted.
At present, RO has a network of about 90 rainfall stations, with some 70 of them being operated manually. Apart from those at RO Headquarters and meteorological stations, manual rainfall observations at other stations are carried out by voluntary observers from all walks of life: government departments, schools, institutions, golf courses and building contractors.
Mr C H Au, a Scientific Officer of RO, said: "Such stations are inspected regularly to ensure proper maintenance of the instruments and the required standard of reporting."
The voluntary observers are also asked to report any suspected fault with these instruments to the RO.
"Training is provided to newly recruited voluntary observers so that they can familiarise with the operation of rain-gauges."
The type of rain-gauge which most voluntary observers are using is the ordinary rain-gauge. It is read manually using a measuring cylinder.
The rainfall data collected by voluntary observers, proved to be very useful. serves a number of purposes.
"It helps RO to conduct hydrometeorological analysis and compile the 'Monthly Weather Summary' and 'Summary of Meteorological Observations in Hong Kong'.
"The information is also used by engineering consultants and academic institutions in planning of water resources, drainage design. flood control and academic research." Mr Au said.
"It is also for cross-checking with data collected by automatic rain-gauges.
"Only with the help of voluntary observers can we maintain a comprehensive record of rainfall data which is available to the Government and the public. Their help is very much appreciated," he added.
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