ISO 18320:2020

Hydrometry — Measurement of liquid flow in open channels — Determination of the stage–discharge relationship

Publication date:   Aug 3, 2020

General information

60.60 Standard published   Aug 3, 2020

ISO

ISO/TC 113/SC 1 Velocity area methods

International Standard

17.120.20   Flow in open channels

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Scope

This document specifies methods of determining the stage?discharge relationship for gauging stations. It specifies an accuracy for defining the stage?discharge relationship based on a sufficient number of discharge measurements, complete with corresponding stage measurements.
This document considers stable and unstable channels and includes brief descriptions of the effects on the stage?discharge relationship of the transition from inbank to overbank flows, shifting controls, variable backwater and hysteresis. Methods of determining discharge for twin-gauge stations, ultrasonic velocity-measurement stations and other complex rating curves are not described in detail.
NOTE These types of rating curves are described separately in other International Standards, Technical Specifications and Technical Reports, which are listed in the Bibliography.

Life cycle

PREVIOUSLY

WITHDRAWN
ISO 1100-2:2010

NOW

PUBLISHED
ISO 18320:2020
60.60 Standard published
Aug 3, 2020