International Standard
ISO 18481:2017
Hydrometry — Liquid flow measurement using end depth method in channels with a free overfall
Reference number
ISO 18481:2017
Edición 1
2017-12
International Standard
Vista previa
ISO 18481:2017
62561
No disponible en español
Publicado (Edición 1, 2017)
Esta norma se revisó y confirmó por última vez en 2023. Por lo tanto, esta versión es la actual.

ISO 18481:2017

ISO 18481:2017
62561
Idioma
Formato
CHF 129
Convertir Franco suizo (CHF) a tu moneda

Resumen

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.

Informaciones generales

  •  : Publicado
     : 2017-12
    : Norma Internacional confirmada [90.93]
  •  : 1
     : 20
  • ISO/TC 113/SC 2
    17.120.20 
  • RSS actualizaciones

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