NF EN ISO 748

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.

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National standards and national normative documents

Publication date

April 2009

Number of pages

55 p.

Reference

NF EN ISO 748

ICS Codes

17.120.20   Flow in open channels

Classification index

X10-301

Print number

1 - 20/04/2009

International kinship

ISO 748:2007

European kinship

EN ISO 748:2007
Sumary
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.

Replaced standards (1)
NF EN ISO 748
January 2002
Standard Cancelled
Measurement of liquid flow in open channels - Velocity-area methods

Standard replaced by (1)
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.

Table of contents
  • Avant-propos
    v
  • 1 Domaine d'application
    1
  • 2 Références normatives
    1
  • 3 Termes et définitions
    1
  • 4 Principe des méthodes de mesurage
    1
  • 5 Choix et délimitation de l'emplacement
    2
  • 5.1 Choix de l'emplacement
    2
  • 5.2 Délimitation de l'emplacement
    3
  • 6 Mesurage de l'aire de la section droite
    3
  • 6.1 Généralités
    3
  • 6.2 Mesurage de la largeur
    3
  • 6.3 Mesurage de la profondeur
    4
  • 7 Mesurage de la vitesse
    5
  • 7.1 Mesurage de la vitesse à l'aide de moulinets
    5
  • 7.2 Mesurage de la vitesse à l'aide de flotteurs
    12
  • 8 Calcul du débit
    14
  • 8.1 Généralités
    14
  • 8.2 Méthode graphique
    14
  • 8.3 Méthodes arithmétiques
    17
  • 8.4 Méthode des verticales indépendantes
    18
  • 8.5 Méthode de la section médiane - Plans horizontaux
    20
  • 8.6 Détermination du débit à partir des mesurages de vitesse par flotteurs de surface
    21
  • 8.7 Détermination du débit en cas de variation du niveau d'eau
    23
  • 9 Incertitudes dans le mesurage du débit
    24
  • 9.1 Généralités
    24
  • 9.2 Définition de l'incertitude
    24
  • 9.3 Méthode de calcul de l'incertitude dans la détermination du débit par mesurage de la vitesse à l'aide de moulinets
    25
  • 9.4 Méthode de calcul de l'incertitude dans la détermination du débit par mesurage de la vitesse à l'aide de flotteurs
    28
  • Annexe A (informative) Correction du fléchissement, de la traction, de l'inclinaison et de la température dans le mesurage de la largeur de la section par ruban ou par câble
    31
  • Annexe B (informative) Mesurage des distances dans la section
    34
  • Annexe C (informative) Corrections de longueur immergée du câble dans le mesurage des profondeurs par un câble non perpendiculaire à la surface
    37
  • Annexe D (informative) Correction de dérive
    40
  • Annexe E (informative) Incertitudes dans le mesurage par exploration du champ des vitesses
    41
  • Annexe F (informative) Détermination de la vitesse moyenne à partir de mesurages au flotteur
    45
  • Bibliographie
    47
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