Reaffirmed 2021

NATIONAL FOREWORD

This Indian Standard (First Revision) which is identical with ISO 9826 : 1992 ‘Measurement of liquid flow in open channels — Parshall and SANIIRI flumes’ issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation of the Hydrometry Sectional Committee and approval of the Water Resources Division Council.

This standard was first published in 1996. This revision is being done to align it with the latest version of ISO 9826 : 1992 .

Various methods are adopted for measurement of flow of water in open channels, like velocity area method, slope area method, etc, depending upon the channel, flow conditions, measuring equipment available, etc. Parshall and SANIIRI flumes are used for flow measurement in open channels, particularly in irrigation canals, under steady or slowly varying flow conditions which may be either free-flow or submerged-flow.

The text of ISO Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:

a) Wherever the words ‘International Standard’ appear referring to this standard, they should be read as ‘Indian Standard’.

b) Comma (,) has been used as a decimal marker, while in Indian Standards, the current practice is to use a point (.) as the decimal marker.