NF EN ISO 748

NF EN ISO 748

December 2021
Standard Current

Hydrometry - Measurement of liquid flow in open channels - Velocity area methods using point velocity measurements

This document specifies methods for determining the velocity and cross-sectional area of water flowing in open channels and for calculating the discharge employing point velocity measurement devices.It is applicable to methods using rotating-element current meters, acoustic doppler velocimeters (ADVs), acoustic doppler current profiler (ADCP) stationary method, surface velocity measurement including floats and other surface velocity systems.Although some general procedures are discussed, this document does not describe in detail how to use or deploy these systems.NOTE         For detailed procedures, refer to guidelines from instrument manufacturers and the appropriate public agencies.

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Main informations

Collections

National standards and national normative documents

Publication date

December 2021

Number of pages

52 p.

Reference

NF EN ISO 748

ICS Codes

17.120.20   Flow in open channels

Classification index

X10-301

Print number

1

International kinship

ISO 748:2021

European kinship

EN ISO 748:2021
Sumary
Hydrometry - Measurement of liquid flow in open channels - Velocity area methods using point velocity measurements

This document specifies methods for determining the velocity and cross-sectional area of water flowing in open channels and for calculating the discharge employing point velocity measurement devices.

It is applicable to methods using rotating-element current meters, acoustic doppler velocimeters (ADVs), acoustic doppler current profiler (ADCP) stationary method, surface velocity measurement including floats and other surface velocity systems.

Although some general procedures are discussed, this document does not describe in detail how to use or deploy these systems.

NOTE         For detailed procedures, refer to guidelines from instrument manufacturers and the appropriate public agencies.

Replaced standards (1)
NF EN ISO 748
April 2009
Standard Cancelled
Hydrometry - Measurement of liquid flow in open channels using current-meters or floats

ISO 748:2007 specifies methods for determining the velocity and cross‑sectional area of water flowing in open channels without ice cover, and for computing the discharge therefrom. ISO 748:2007 covers methods of employing current‑meters or floats to measure the velocities. It deals only with single measurements of the discharge; the continuous recording of discharges over a period of time is covered in ISO 1100-1 and ISO 1100-2.

Table of contents
  • Avant-propos
  • 1 Domaine d'application
  • 2 Références normatives
  • 3 Termes et définitions
  • 4 Principe des méthodes de mesurage
  • 5 Sélection du site
  • 6 Mesurage de l'aire de la section transversale
  • 7 Mesurage de la vitesse moyenne
  • 8 Calcul du débit
  • 9 Incertitudes sur le mesurage du débit
  • Annexe A (informative) Utilisation des courantomètres à vitesse ponctuelle
  • Annexe B (informative) Mesurage de la vitesse superficielle à l'aide de flotteurs
  • Annexe C (informative) Exemples de systèmes de vitesse superficielle
  • Annexe D (informative) Incertitudes sur le mesurage par exploration du champ des vitesses
  • Annexe E (informative) Mesurage de la vitesse dans des conditions de glace
  • Annexe F (informative) Corrections de longueur immergée du câble dans le mesurage des profondeurs par un câble non perpendiculaire à la surface
  • Bibliographie
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