ICS 17.120.20                          WRD 01

Reaffirmed 2022

1. Scope

This standard provides an understanding of the nature of measurement uncertainty and its significance in estimating the ‘quality’ of a measurement or a determination in hydrometry. It is applicable to flow measurements in natural and man-made channels. Rainfall measurements are not covered.

2. Referenced

The following standards contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below.

IS No. Title

1191 : 2003 Hydrometric determinations — Vocabulary and symbols (second revision)

1192 : 1981 Velocity area methods for measurement of flow of water in open channels (first revision)