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  • BSI
    BS ISO 18481:2017 Hydrometry. Liquid flow measurement using end depth method in channels with a free overfall
    Edition: 2017
    $435.35
    / user per year

Description of BS ISO 18481:2017 2017

This document specifies a method for the estimation of the sub-critical flow of clear water in a smooth, essentially horizontal channel (or a gently sloping channel), abruptly discontinued at bottom by a hydraulic structure, with a vertical drop and discharging freely. Such an overfall forms a control section and offers a means for the estimation of flow using the end depth measurement method. A wide variety of channel cross-sections with overfall have been studied, but only those which have received general acceptance after adequate research and testing, and therefore do not require in situ calibration, are considered. This document covers channels with the following types of cross-sections:

  1. rectangular with confined and unconfined nappe;

  2. trapezoidal;

  3. triangular;

  4. circular;

  5. parabolic.

The flow at the brink is curvilinear; therefore, the measured depth at the drop is not equal to the critical depth as computed by the principle based on assumption of parallel flow. However, the end depth and the critical depth (as in the case of the assumption of parallel flow) have unique relation, which is used to estimate the flow through these structures.



Standard NumberBS ISO 18481:2017
TitleHydrometry. Liquid flow measurement using end depth method in channels with a free overfall
StatusConfirmed
Publication Date2017-12-18
Identical National Standard OfISO 18481:2017
DescriptorsTerminology, Flow, Symbols, Liquid flow, Definitions, Vocabulary, Hydrometry, Flow measurement, Water
ICS17.120.20 Flow in open channels
CommitteeCPI/113
ISBN978 0 580 86504 6
PublisherBSI
Pages28

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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