Self Recording Rain Gauges as per IS:5235 :1969.
Non Recording Rain Gauges as per IS:5225 :1969.
Recording raingauges are used to obtain a continuous record of daily or weekly rainfall. It consists of a funnel-shaped collector at the top of the gauge and a float syphony chamber and recording mechanism just below it. the rain water collected by the collector is led into the float chamber. The float is having a central stem on which a pen assembly is fixed. The pen is moving over a daily (or weekly) chart wound over a clock drum. After every one centimetre of rainfall syphoning occurs and recording of rain starts afresh.Rain Gauge-Non RecordingThe essential parts of an ordinary raingauge are a funnel through which the rain water is collected in a receiver and a measuring glass (rain measure) with which the rain water collected is measured. There is an additional cylinder in order to avoid possible losses due to overflow from the receiver. The correct type of rain measure suitable to the type of raingauge in use has to be used for the measurement of rainfall. The rain measure is graduated for every 0.2 mm of rainfall.