Currently operate to ISO 1100-1 and ISO 1100-2 for operation of gauging stations and flow measurement in open channels, and ISO 748 for gaugings using current meters.

Currently there is no prescriptive standard for rainfall measurement other than the old met standards pertaining to orifice height and exposure.

A council collective has now drafted a National Environmental Monitoring Standard for rainfall which is currently being circulated (April 2011).

It covers all aspects of rainfall measurement including siting of gauge, telemetering of data and processing. When finalised it is expected to become the national standard.

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