Weather Instruments
i
Chapter 6 Measurement of Precipitation
CONTENTS
6.1 Definitions and Units ............................................................................................................ 1
6.2 Observation Instruments ..................................................................................................... 1
6.2.1 Cylindrical Rain Gauges and Ordinary Rain Gauges ................................................ 1
6.2.2 Siphon Rain Gauges ...................................................................................................... 3
6.2.3 Tipping Bucket Rain Gauges ........................................................................................ 4
6.2.4 Tipping Bucket Rain Gauge Recorder ......................................................................... 6
6.2.5 Exposure ......................................................................................................................... 7
6.2.6 Windshields .................................................................................................................... 7
6.3 Maintenance .......................................................................................................................... 9
6.3.1 Sources of Errors ........................................................................................................... 9
6.3.2 Maintenance ................................................................................................................. 10
6.4 Calibration ........................................................................................................................... 12
6.4.1 Instruments Required for Calibration ........................................................................ 12
6.4.2 Methods of Calibration ................................................................................................ 13
6.5 Inspection and Repair (Adjustment)
Chapter 6 Measurement of Precipitation
CONTENTS
6.1 Definitions and Units ............................................................................................................ 1
6.2 Observation Instruments ..................................................................................................... 1
6.2.1 Cylindrical Rain Gauges and Ordinary Rain Gauges ................................................ 1
6.2.2 Siphon Rain Gauges ...................................................................................................... 3
6.2.3 Tipping Bucket Rain Gauges ........................................................................................ 4
6.2.4 Tipping Bucket Rain Gauge Recorder ......................................................................... 6
6.2.5 Exposure ......................................................................................................................... 7
6.2.6 Windshields .................................................................................................................... 7
6.3 Maintenance .......................................................................................................................... 9
6.3.1 Sources of Errors ........................................................................................................... 9
6.3.2 Maintenance ................................................................................................................. 10
6.4 Calibration ........................................................................................................................... 12
6.4.1 Instruments Required for Calibration ........................................................................ 12
6.4.2 Methods of Calibration ................................................................................................ 13
6.5 Inspection and Repair (Adjustment)