ISO/TR 9210:2017
(Main)Hydrometry — Measurement in meandering river and in streams with unstable boundaries
Hydrometry — Measurement in meandering river and in streams with unstable boundaries
ISO/TR 9210:2017 provides guidelines for discharge measurements in meandering and braided rivers, and from bridges, following the provisions of ISO 748.
Hydrométrie — Mesurage en rivières à méandres et en cours d'eau à limites instables
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TECHNICAL ISO/TR
REPORT 9210
Second edition
2017-11
Hydrometry — Measurement in
meandering river and in streams with
unstable boundaries
Hydrométrie — Mesurage en rivières à méandres et en cours d'eau à
limites instables
Reference number
ISO/TR 9210:2017(E)
©
ISO 2017
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ISO/TR 9210:2017(E)
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ISO/TR 9210:2017(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Site selection in rivers . 2
5 Site selection in rivers with relatively stable meanders . 2
6 Site selection in rivers with unstable meanders . 3
7 Discharge measurement in braided rivers . 3
8 Discharge measurement from a bridge with piers . 4
Bibliography . 7
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ISO/TR 9210:2017(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
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described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
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URL: www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 113, Hydrometry, Subcommittee SC 1,
Velocity area methods.
This second edition cancels and replaces the first edition (ISO/TR 9210:1992), which has been
technically revised.
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ISO/TR 9210:2017(E)
Introduction
Various methods of measurements of discharge in open channels are available, of which the velocity-
area method is most extensively used. The principles of this method are published in ISO 748.
However, there are rivers and streams, in which there are no river sections with constant bed levels and
constant flow conditions. This document deals specifically with measurements of flow in meandering
and braided rivers, and elaborates some of the provisions in ISO 748.
© ISO 2017 – All rights reserved v
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TECHNICAL REPORT ISO/TR 9210:2017(E)
Hydrometry — Measurement in meandering river and in
streams with unstable boundaries
1 Scope
This document provides guidelines for discharge measurements in meandering and braided rivers, and
from bridges, following the provisions of ISO 748.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 772, Hydrometry — Vocabulary and symbols
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 772 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at http://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
3.1
alluvial river
river, which flows through alluvium, formed from its own deposits
Note 1 to entry: The sediment carried by an alluvial river, except for the wash load, is similar to that in the bed.
3.2
braided river
river characterized by a wide and shallow open channel, in which flow passes through a number of
small-interlaced channels separated by shoals
Note 1 to entry: Frequently, there is little or no erosion of the main banks of a braided river.
Note 2 to entry: Generally, there is little or no meandering of the main channel of a braided river, but meandering
in the minor channels is usual.
3.3
meandering river
channel following a sinuous path, characterized by curved flow leading to bank erosion alternating
with shoaling
3.4
transition
crossover
inflection reach between two meander loops in which the main flow crosses from one side of the
channel to the other
Note 1 to entry: The depth of flow in a transition is usually reduced from normal depth and is more uniform than
in the curved reach.
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ISO/TR 9210:2017(E)
3.5
transverse flow
flow horizontally perpendicular to the main direction of flow parallel to the axis of the open channel(s)
Note 1 to entry: Transverse (lateral) flow is frequently associated with secondary flow.
Note 2 to entry: Transverse (lateral) flow in open channels with a curved plan form causes superelevation of the
water surface at the outside of the bend.
3.6
nodal point
node
inflection point
point in a transition at which the sinuous path crosses the mean axis of the meander system
Note 1 to entry: In a meandering stable channel, the nodal point migrates downstream with the meander loops.
Migration can be prevented by the creation of a natural or artificial obstruction in the channel.
3.7
gauge
device installed at a gauging station for measuring the level of the surface of the liquid relative to a datum
4 Site selection in rivers
However, when the flow directions during flood and low flow seasons are very different, it is
permissible to suitably adjust the orientation of gauging section during that season, taking into account
the requirements in ISO 748:2007, 5.1 a) and b).
ISO 748:2007, 5.1 b) further states that the accuracy of the determination of discharge is increased if
the flow directions for all points on any vertical are parallel to one another, and at right angles to the
measurement section.
ISO 748:2007, 5.1 c) recommends that the bed and the margins of the channels should be stable and
well-defined at all stages of flow in order to facilitate accurate measurement of the cross-section, and
...
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