8333 International Standard (ISO INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEXAYHAPOAHAR OPTAHV3ALMA HO CTAHAAPTW3AUWM·ORGANISATION INTE RNATIONALE DE NO RMALISATION Liquid flow measurement in open channels by weirs and flumes - V-shaped broad-crested weirs Mesure de debit des liquides dans les canaux decouverts au moyen de déversoirs et de canaux jaugeurs - Deversoirs a seuil épais en V First edition - 1985-12-01 UDC 532.532.3 Ref. No. ISO 8333-1985 (E) Descriptors : liquid flow, water flow, open channel flow, weirs, flow measurement, error analysis. Copyright International Organization for Standardization without license from IHS Not for Resale Foreword Iso (the International Organization for Standardization) is a worldwide federation of national standards bodies (IsO member bodies). The work of preparing International Standards is normally carried out through IsO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern- mental 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. They are approved in accordance with IsO procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 8333 was prepared by Technical Committee ISO/TC 113, Measurementof liquid flow in open channels. Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition, unless otherwise stated. ? International Organization for Standardization,1985 Printed in Switzerland without license from IHS Not for Resale INTERNATIONAL STANDARD ISO 8333-1985 (E) Liquid flow measurement in open channels by weirs and flumes - V-shaped broad-crested weirs Scope and field of application 5 Installation This International Standard specifies a method for the 5.1 Selection of site measurement of subcritical flow in small rivers and artificial channels using V-shaped broad-crested weirs. A preliminary survey shall be made of the physical and The advantages of this type of weir are described in clause 8. hydraulic features of the proposed site to check that it con- forms (or may be made to conform) to the requirements NOTE -- A comparison of the different types of weirs and flumes will necessary for measurement using the weir. form the subject of a future International Standard. Particular attention shall be paid to the following features in selecting the site of the weir : 2 References a) the availability of an adequate length of channel of ISo 772, Liquid flow measurement in open channels regular cross-section; Vocabulary and symbols. Iso 4373, Measurement of liquid flow in open channels b) the existing velocity distribution; Water level measuring devices. c) the avoidance of channels having gradients greater than Iso 4374, Liquid flow measurement in open channels - 1 in 250; Round-nose horizontal crest weirs. d) the consequential effects of any increased upstream Iso 5168, Measurement of fluid flow -- Estimation of uncer- water level due to the measuring structure; tainty of a flow-rate measurement. e) the consequential conditions downstream, including such influences as tides, confluences with other streams, 3Definitions sluice gates, mill dams and other controlling features which might cause drowning; For the purposes of this International Standard, the definitions given in isO T72 apply. f) the impermeability of the ground on which the structure is to be founded, and the necessity for piling, grouting or 4 Units of measurement other sealing in river installations; The units of measurement used in this International Standard g) the necessity for flood banks to confin
ISO 8333-1985Liquid flow measurement in open channels by weirs and flumes. V-shaped broad-crested we
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