Norme internationale
ISO 18481:2017
Hydrométrie — Mesure du débit liquide dans les chenaux à déversoir sans pelle
Numéro de référence
ISO 18481:2017
Edition 1
2017-12
Norme internationale
Prévisualiser
ISO 18481:2017
62561
Indisponible en français
Publiée (Edition 1, 2017)
Cette norme a été révisée et confirmée pour la dernière fois en 2023. Cette édition reste donc d’actualité.

ISO 18481:2017

ISO 18481:2017
62561
Langue
Format
CHF 129
Convertir les francs suisses (CHF) dans une autre devise

Résumé

ISO 18481:2017 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:

a) rectangular with confined and unconfined nappe;

b) trapezoidal;

c) triangular;

d) circular;

e) 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.

Informations générales

  •  : Publiée
     : 2017-12
    : Norme internationale confirmée [90.93]
  •  : 1
  • ISO/TC 113/SC 2
    17.120.20 
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