4369 International Standard (ISO) INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEXAYHAPOAHAA OPrAHM3ALIMH HO CTAHAAPTW3ALWW+ORGANISATION INTERNATIONALE DE NO RMALISATION Measurement of liquid flow in open channels - Moving-boat method Mesure de debit des liquides dans les canaux decouverts -- Méthode du canot mobile First edition - 1979-10-15 UDC 532.573 4369-1979 (E) Ref. No. ISO 4369-1979 (E) Descriptors : open channel flow, liquid flow, flow measurement, boats, equipment specifications, velocity measurement, error analysis. Copyright International Organization for Standardization Price based on 27 pages without license from IHS Not for Resale Foreword Iso (the International Organization for Standardization) is a worldwide federation of national standards institutes (IsO member bodies). The work of developing Interna- tional Standards is carried out through IsO technical committees. Every member body interested in a subject for which a technical committee has been set up has the right to be represented on that committee. International organizations, governmental and non- governmental, in liaison with Iso, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the Iso Council. International Standard ISO 4369 was developed by Technical Committee ISO/TC 113, Measurement of liquid flow in open channels, and was circulated to the member bodies in May 1977. Australia Germany, F.R. Switzerland Canada India Turkey Italy Czechoslovakia United Kingdom Egypt, Arab Rep. of USA Netherlands Finland Romania USSR France Spain Yugoslavia No member body expressed disapproval of the document. @ International Organization for Standardization, 1979 Printed in Switzerland ited without license from IHS Not for Resale INTERNATIONAL STANDARD ISO 4369-1979 (E) Measurement of liquid flow in open channels Moving-boat method General 1 Scope and field of application 5 Frequently, on large rivers and estuaries, conventional methods This International Standard specifies methods for measuring of measuring discharge by current meters are difficult and discharge in large rivers and estuaries by the moving-boat technique. In the following sections procedures applicable to involve costly and tedious procedures. this method and the general requirements of equipment are covered. A complete facsimile example of computation of a This is particularly true at remote sites where no facilities exist, moving boat measurement is given in the annexes. or during floods when facilities may be inundated or inaccessible. 2 References In those cases where unsteady flow conditions require that measurement be made as rapidly as possible, the moving-boat Iso 748, Liquid flow measurement in open channels - technique is applicable. It requires no fixed facilities and it lends itself to the use of alternate sites. Velocity area methods. Iso 772, Liquid flow measurement in open channels -- The moving-boat technique uses a velocity-area method of Vocabulary and symbols. determining discharge. The technique requires that the following information be obtained : Iso 3454, Liquid flow measurement in open channels - Sounding and suspension equipment. a) location of observation points across the stream with reference to the distance from an initial point; ISo 4366, Liquid flow measurement in open channels - Echo b) stream depth, d, at each observation point; sounders. IS0 5168, Calculation of the uncertainty of a measurement of c) stream velocity, v, perpendicutar to the cross section at flowrate.i) each observation point. The principal difference between a conventional measurement 3 Definitions and the moving-boat measurement is in the method of data collection. The mean velocity in the segments of a cross For the purpose of this International Standard the definitions section of the stream in the case of a conventional technigue is given in ISO 7