|WORLD METEOROLOGICAL ORGANIZATION||
|Explanation of the criteria for classification and numbering of components||
|Explanation of the dates on the component's description|
1. Purpose and objectives
used for daily rainfall measurement in tropical countries.
The instrument is the 203mm-diameter rain gauge for daily rainfall measurement. The gauge is made of copper sheet material and consists of the following items:
funnel and U-tube;
The mouth of
the collecting funnel is a sharp edge bevelled ring of 203mm internal
diameter. The funnel is connected to a U-tube through which the rain
passes into the collecting can. A negligible amount of rain remains in
the U-tube in order to reduce loss by evaporation.
measured by the appointed observer.
5. Operational requirements and restrictions
galvanised iron windshield is used in conjunction with the rain
gauge to reduce the wind effect on the rainfall measurement. The
whole assembly is securely installed at standard convenient
height of 1350mm above ground level in order to avoid flooding or
6. Form of presentation
drawings for local manufacture are available.
7. Operational experience
It has been
used satisfactorily as a standard instrument for daily rainfall measurement for years by the Drainage and Irrigation
8. Originator and technical support
Irrigation Department, Malaysia.
10. Conditions on use
Technical drawings available free of charge. Purchase of the instrument, either complete or as individual items, from the local manufacturers in Malaysia can also be arranged.
|(First entered: 6 MAR 81||
Last updated: 28 MAY 99)