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

<p>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.</p> <p>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.</p> <p>Although some general procedures are discussed, this document does not describe in detail how to use or deploy these systems.</p> <p>NOTE         For detailed procedures, refer to guidelines from instrument manufacturers and the appropriate public agencies.</p>

Table of contents
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  • 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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