SIST EN ISO 772:2002/A2:2005
(Amendment)Hydrometric determinations - Vocabulary and symbols (ISO 772:1996/Amd 2:2004)
Hydrometric determinations - Vocabulary and symbols (ISO 772:1996/Amd 2:2004)
Hydrometrische Festlegungen - Begriffe und Zeichen (ISO 772:1996/Amd 2:2004)
Déterminations hydrométriques - Vocabulaire et symboles (ISO 772:1996/Amd 2:2004)
Hidrometrične določbe - Slovar in simboli (ISO 772:1996/Amd 2:2004)
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 772:2002/A2:2005
01-julij-2005
+LGURPHWULþQHGRORþEH6ORYDULQVLPEROL ,62 $PG
Hydrometric determinations - Vocabulary and symbols (ISO 772:1996/Amd 2:2004)
Hydrometrische Festlegungen - Begriffe und Zeichen (ISO 772:1996/Amd 2:2004)
Déterminations hydrométriques - Vocabulaire et symboles (ISO 772:1996/Amd 2:2004)
Ta slovenski standard je istoveten z: EN ISO 772:2000/A2:2005
ICS:
01.040.17 Meroslovje in merjenje. Metrology and measurement.
Fizikalni pojavi (Slovarji) Physical phenomena
(Vocabularies)
17.120.20 Pretok v odprtih kanalih Flow in open channels
SIST EN ISO 772:2002/A2:2005 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 772:2002/A2:2005
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SIST EN ISO 772:2002/A2:2005
EUROPEAN STANDARD
EN ISO 772:2000/A2
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2005
ICS 01.040.17; 17.120.20
English version
Hydrometric determinations - Vocabulary and symbols (ISO
772:1996/Amd 2:2004)
Déterminations hydrométriques - Vocabulaire et symboles Hydrometrische Festlegungen - Begriffe und Zeichen (ISO
(ISO 772:1996/Amd 2:2004) 772:1996/Amd 2:2004)
This amendment A2 modifies the European Standard EN ISO 772:2000; it was approved by CEN on 8 April 2005.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for inclusion of this
amendment into the relevant national standard without any alteration. Up-to-date lists and bibliographical references concerning such
national standards may be obtained on application to the Central Secretariat or to any CEN member.
This amendment exists in three official versions (English, French, German). A version in any other language made by translation under the
responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
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EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 772:2000/A2:2005: E
worldwide for CEN national Members.
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SIST EN ISO 772:2002/A2:2005
EN ISO 772:2000/A2:2005 (E)
Foreword
The text of ISO 772:1996/Amd 2:2004 has been prepared by Technical Committee ISO/TC 113
"Hydrometric determinations” of the International Organization for Standardization (ISO) and has
been taken over as EN ISO 772:2000/A2:2005 by Technical Committee CEN/TC 318
"Hydrometry", the secretariat of which is held by BSI.
This European Standard shall be given the status of a national standard, either by publication of
an identical text or by endorsement, at the latest by November 2005, and conflicting national
standards shall be withdrawn at the latest by November 2005.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,
Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Endorsement notice
The text of ISO 772:1996/Amd 2:2004 has been approved by CEN as EN ISO
772:2000/A2:2005 without any modifications.
2
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SIST EN ISO 772:2002/A2:2005
INTERNATIONAL ISO
STANDARD 772
Fourth edition
1996-04-15
AMENDMENT 2
2004-05-01
Hydrometric determinations —
Vocabulary and symbols —
AMENDMENT 2
Déterminations hydrométriques — Vocabulaire et symboles —
AMENDEMENT 2
Reference number
ISO 772:1996/Amd.2:2004(E)
©
ISO 2004
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SIST EN ISO 772:2002/A2:2005
ISO 772:1996/Amd.2:2004(E)
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© ISO 2004
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ii © ISO 2004 – All rights reserved
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SIST EN ISO 772:2002/A2:2005
ISO 772:1996/Amd.2:2004(E)
Contents Page
Foreword. iv
1 General terms. 1
2 Velocity area-methods. 2
6 Sediment transport. 14
8 Groundwater. 15
Annex C (informative) Classification of flow measurement structures . 17
© ISO 2004 – All rights reserved iii
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SIST EN ISO 772:2002/A2:2005
ISO 772:1996/Amd.2:2004(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
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International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
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International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
Amendment 2 to ISO 772:1996 was prepared by Technical Committee ISO/TC 113, Hydrometric
determinations, Subcommittee SC 3, Terminology and symbols.
This amendment consists of the complete revision of Clause 3 “Notches, weirs and flumes” comprising the
modification of several definitions and the inclusion of some new terms and definitions. In addition, the terms
and definitions have been arranged in a more logical sequence. New terms are also added to Clauses 6 and 8
and some minor changes are made to the definitions of a few terms in Clauses 1, 2, 6 and 8.
iv © ISO 2004 – All rights reserved
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SIST EN ISO 772:2002/A2:2005
ISO 772:1996/Amd.2:2004(E)
Hydrometric determinations — Vocabulary and symbols —
AMENDMENT 2
Contents
Page ii, Contents
Replace the existing title of Clause 3 with “Flow measurement structures”.
1 General terms
Page 2, Term 1.6
After the definition for critical flow, add the following Note 1 and renumber the Note as Note 2:
“NOTE 1 This is the generic definition of critical flow. See critical flow (3.26) for the specific definition when used in
reference to the field of flow measurement structures.”
Pages 6, 7 and 9, Clause 1
Replace the definitions for Terms 1.35, 1.41, 1.42, 1.61 and 1.62 as follows:
1.35
transition
crossover
inflection reach between two meander loops in which the main flow crosses from one side of the channel to
the other
NOTE The depth of flow in a transition is usually reduced from normal depth and is more uniform than in the curved
reach.
1.41
stream gauging
all of the operations necessary for the measurement of discharge of a stream
1.42
discharge measurement
process of measuring the discharge of liquid in an open channel
1.61
converging reach
reach in which the cross-sectional area gradually decreases in the direction of flow
1.62
expanding reach
reach in which the cross-sectional area gradually increases in the direction of flow
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SIST EN ISO 772:2002/A2:2005
ISO 772:1996/Amd.2:2004(E)
2 Velocity area-methods
Page 26, Clause 2
Replace the definition for Term 2.21 as follows:
2.21
moving boat method
method of measuring discharge from a boat by traversing the stream along the measuring section while
continuously measuring velocity, depth, distance travelled and angle of current velocity
Page 32, Clause 3
Delete Clause 3, entitled Notches, weirs and flumes, and replace the entire Clause 3 by the following new text
and figures.
3 Flow measurement structures
NOTE A classification of flow measurement structures is given in Annex C.
3.1
flow measurement structure
hydraulic structure (e.g. weir, flume or gate) installed in an open channel where in most cases the discharge
can be derived from the measured upstream water level
NOTE The structure is an artificial reduction of the cross-sectional area in the channel, where part of the upstream
total head is converted into kinetic energy used to obtain critical flow.
3.2
weir
overflow structure that may be used for controlling upstream surface level or for measuring discharge or both.
See Figure 6.
2 © ISO 2004 – All rights reserved
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SIST EN ISO 772:2002/A2:2005
ISO 772:1996/Amd.2:2004(E)
Key
1 weir crest
2 weir block
3 hydraulic jump
4 total head line
5 direction of flow
6 control block
7 stilling basin
Figure 6 — Weir
3.3
height of weir
apex height
height from the upstream bed to the lowest point of the crest
3.4
head over the weir
elevation of the water surface above the lowest point of the crest, measured at a point sufficiently upstream to
be unaffected by the drawdown of the weir
NOTE The distance upstream of the point of measurement depends on the type of weir used.
3.5
upstream total head
elevation of the total head relative to the flume invert level or the weir crest level, measured upstream of the
structure
3.6
downstream total head
elevation of the total head relative to the flume invert level or weir crest level, measured downstream of the
structure
3.7
weir abutment
abutment
wing wall
wall at the side of a channel, generally parallel to the longitudinal axis of the weir, against which the weir
terminates
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SIST EN ISO 772:2002/A2:2005
ISO 772:1996/Amd.2:2004(E)
3.8
weir block
weir body
part of a weir lying between the abutments and over which the water flows
See Figure 6.
3.9
full-width weir
suppressed weir
weir whose crest fills the width of the channel in which it is placed, thus eliminating side contraction of the
stream
3.10
divide wall
wall running in the direction of flow and separating the individual sections of a compound structure
3.11
glacis
sloping downstream face of a weir block and continuation of the crest
3.12
weir slope
ratio of the horizontal to the vertical components of the upstream face, the downstream face or the cross-slope
of a weir
3.13
approach channel
reach of the channel upstream of the gauging structure in which suitable flow conditions have to be
established to ensure correct gauging
3.14
straightening vane
guide vane
baffle
device placed in the approach channel to improve flow conditions
cf. baffle (3.15)
3.15
baffle
wall or block placed downstream of a structure to dissipate energy or to cause improved velocity distribution
cf. straightening vane (3.14)
3.16
control block
baffle pier
energy-breaking block
block constructed in a channel or stilling basin to increase turbulence and thereby dissipate the energy of
water flowing at high velocity
NOTE See Figure 6 for the application of a control block to a weir construction.
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SIST EN ISO 772:2002/A2:2005
ISO 772:1996/Amd.2:2004(E)
3.17
stilling basin
basin constructed downstream of a structure to dissipate the energy of fast-flowing water and to protect the
bed and banks from erosion
See Figure 6.
3.18
separation pocket
〈at a corner or at a point of large curvature〉 region of recirculating flow at a structure caused by separation of
the main flow from the structure
cf. separation pocket (3.19)
NOTE This phenomenon can occur at broad-crested weirs which do not have rounded upstream or downstream
corners or which do not have a crest of sufficient length in the direction of flow.
3.19
separation pocket
〈triangular-profile weir〉 near-cylindrical volume of slowly moving water immediately downstream of the crest of
the structure
cf. separation pocket (3.18)
3.20
throat
that part of a flume at which critical flow occurs; usually where the wetted cross-sectional area is at a minimum
NOTE The throat may be rectangular, trapezoidal, U-shaped or of another specially designed shape.
3.21
modular flow
free flow
flow over or through a structure when the upstream level is independent of the downstream level for a given
discharge
3.22
discharge coefficient
coefficient in the discharge equation depending on the type and shape of the measuring structure, and the
head over the weir
3.23
modular limit
submergence ratio for flow over a weir at which the upstream level just begins to be affected by the
downstream level for a given discharge
3.24
drowned flow
nonmodular flow
submerged flow
flow, over or through a structure, when it is affected by changes in the level downstream
3.25
submergence ratio
ratio of the downstream total head to the upstream total head at a structure
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SIST EN ISO 772:2002/A2:2005
ISO 772:1996/Amd.2:2004(E)
3.26
critical flow
flow conditions for which the total energy head above the invert reaches a minimum at a given discharge and
for given channel dimensions
NOTE 1 This is the specific defi
...
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