oSIST prEN ISO 22282-1:2008
(Main)Geotechnical investigation and testing - Geohydraulic testing - Part 1: General rules (ISO/DIS 22282-1:2008)
Geotechnical investigation and testing - Geohydraulic testing - Part 1: General rules (ISO/DIS 22282-1:2008)
2010-07-09 EMA: ISO/CS confirmed that no text has been received, WI deleted following the 3-year timeframe exercise.
Geotechnische Erkundung und Untersuchung - Geohydraulische Versuche - Teil 1: Allgemeine Regeln (ISO/DIS 22282-1:2008)
Das vorliegende Dokument behandelt die allgemeinen Regeln und Grundsätze für geohydraulische Versuche in Boden und Fels als Teil der geotechnischen Erkundungsdienste nach EN 1997 1 und prEN 1997 2. Es definiert Begriffe und legt Anforderungen an die Messung der Durchlässigkeit von Boden und Fels fest.
Die verschiedenen Zwecke von geohydraulischen Versuchen bestehen darin, Informationen zur Durchlässigkeit von Boden oder Fels im natürlichen oder behandelten Zustand, zur Transmissivität und zum Speicherkoeffizienten sowie zu den hydrodynamischen Parametern von Grundwasserleitern zu gewinnen.
Geohydraulische Versuche werden zu vielen Zwecken eingesetzt, beispielsweise den folgenden:
a) Absorptionsvermögen und Wirksamkeit der Verpressung in Gebirge;
b) Beurteilung der Versickerung und der Entwässerung;
c) Beurteilung der Arbeiten zur Grundwasserabsenkung;
d) Auswirkungen der Dichtungen für Talsperren;
e) Auswirkungen von Tunnel Schachtabsenkungen;
f) Überprüfung der Dichtheit der Füllung oder Abdeckung;
g) Beurteilung des Durchflusses von Fluiden und Suspensionen im Baugrund;
h) Planung von Instandsetzungsmaßnahmen.
ANMERKUNG 1 Geohydraulische Versuche für die Wasserversorgung werden durch ISO 14686 abgedeckt.
ANMERKUNG 2 Für die meisten Arten des Baugrunds ergeben Feldversuche zur Durchlässigkeit zuverlässigere Daten als im Laboratorium durchgeführte Versuche, da ein größeres Materialvolumen untersucht wird und da der Baugrund vor Ort geprüft wird, so dass die Auswirkungen der Konstruktion auf die Masse des Baugrunds mit einbezogen werden, die mit der Probenahme verbundenen Störungen jedoch vermieden werden.
Das Dokument behandelt die Durchführung von Versuchen mit Grundwasser; andere Fluide und Suspensionen werden nicht explizit betrachtet.
Reconnaissance et essais géotechniques - Essais géohydrauliques - Partie 1: Règles générales (ISO/DIS 22282-1:2008)
Geotehnično preiskovanje in preskušanje - Hidrogeološke preiskave - 1. del: Splošna pravila (ISO/DIS 22282-1:2008)
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN ISO 22282-1:2008
01-julij-2008
*HRWHKQLþQRSUHLVNRYDQMHLQSUHVNXãDQMH+LGURJHRORãNHSUHLVNDYHGHO
6SORãQDSUDYLOD ,62',6
Geotechnical investigation and testing - Geohydraulic testing - Part 1: General rules
(ISO/DIS 22282-1:2008)
Reconnaissance et essais géotechniques - Essais géohydrauliques - Partie 1: Règles
générales (ISO/DIS 22282-1:2008)
Ta slovenski standard je istoveten z: prEN ISO 22282-1
ICS:
93.020 Zemeljska dela. Izkopavanja. Earthworks. Excavations.
Gradnja temeljev. Dela pod Foundation construction.
zemljo Underground works
oSIST prEN ISO 22282-1:2008 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
oSIST prEN ISO 22282-1:2008
---------------------- Page: 2 ----------------------
oSIST prEN ISO 22282-1:2008
EUROPEAN STANDARD
DRAFT
prEN ISO 22282-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2008
ICS 13.080.40
English Version
Geotechnical investigation and testing - Geohydraulic testing -
Part 1: General rules (ISO/DIS 22282-1:2008)
Reconnaissance et essais géotechniques - Essais
géohydrauliques - Partie 1: Règles générales (ISO/DIS
22282-1:2008)
This draft European Standard is submitted to CEN members for parallel enquiry. It has been drawn up by the Technical Committee
CEN/TC 341.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
This draft European Standard was established by CEN 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 CEN Management Centre has the
same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN ISO 22282-1:2008: E
worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
oSIST prEN ISO 22282-1:2008
prEN ISO 22282-1:2008 (E)
Contents Page
Foreword.3
2
---------------------- Page: 4 ----------------------
oSIST prEN ISO 22282-1:2008
prEN ISO 22282-1:2008 (E)
Foreword
This document (prEN ISO 22282-1:2008) has been prepared by Technical Committee CEN/TC 341
"Geotechnical Investigation and Testing", the secretariat of which is held by ELOT, in collaboration with
Technical Committee ISO/TC 182 "Geotechnics".
This document is currently submitted to the parallel Enquiry.
3
---------------------- Page: 5 ----------------------
oSIST prEN ISO 22282-1:2008
---------------------- Page: 6 ----------------------
oSIST prEN ISO 22282-1:2008
DRAFT INTERNATIONAL STANDARD ISO/DIS 22282-1
ISO/TC 182/SC 1 Secretariat: DIN
Voting begins on: Voting terminates on:
2008-04-17 2008-09-17
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION • МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ • ORGANISATION INTERNATIONALE DE NORMALISATION
Geotechnical investigation and testing — Geohydraulic
testing —
Part 1:
General rules
Reconnaissance et essais géotechniques — Essais géohydrauliques —
Partie 1: Règles générales
ICS 93.020
ISO/CEN PARALLEL ENQUIRY
This draft International Standard is a draft standard developed within the European Committee for
Standardization (CEN) and processed under the CEN-lead mode of collaboration as defined in the
Vienna Agreement. The document has been transmitted by CEN to ISO for circulation for ISO member
body voting in parallel with CEN enquiry. Comments received from ISO member bodies, including those
from non-CEN members, will be considered by the appropriate CEN technical body. Should this DIS be
accepted, a final draft, established on the basis of comments received, will be submitted to a parallel two-
month FDIS vote in ISO and formal vote in CEN.
In accordance with the provisions of Council Resolution 15/1993 this document is circulated in
the English language only.
Conformément aux dispositions de la Résolution du Conseil 15/1993, ce document est distribué
en version anglaise seulement.
To expedite distribution, this document is circulated as received from the committee secretariat.
ISO Central Secretariat work of editing and text composition will be undertaken at publication
stage.
Pour accélérer la distribution, le présent document est distribué tel qu'il est parvenu du
secrétariat du comité. Le travail de rédaction et de composition de texte sera effectué au
Secrétariat central de l'ISO au stade de publication.
THIS DOCUMENT IS A DRAFT CIRCULATED FOR COMMENT AND APPROVAL. IT IS THEREFORE SUBJECT TO CHANGE AND MAY NOT BE
REFERRED TO AS AN INTERNATIONAL STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS BEING ACCEPTABLE FOR INDUSTRIAL, TECHNOLOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN NATIONAL REGULATIONS.
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT, WITH THEIR COMMENTS, NOTIFICATION OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPORTING DOCUMENTATION.
©
International Organization for Standardization, 2008
---------------------- Page: 7 ----------------------
oSIST prEN ISO 22282-1:2008
ISO/DIS 22282-1
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall
not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the
unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.
Copyright notice
This ISO document is a Draft International Standard and is copyright-protected by ISO. Except as permitted
under the applicable laws of the user's country, neither this ISO draft nor any extract from it may be
reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, photocopying,
recording or otherwise, without prior written permission being secured.
Requests for permission to reproduce should be addressed to either ISO at the address below or ISO's
member body in the country of the requester.
ISO copyright office
Case postale 56 CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Reproduction may be subject to royalty payments or a licensing agreement.
Violators may be prosecuted.
©
ii ISO 2008 – All rights reserved
---------------------- Page: 8 ----------------------
oSIST prEN ISO 22282-1:2008
ISO/DIS 22282-1
Contents Page
Foreword .iv
Introduction.v
1 Scope.1
2 Normative references.1
3 Terms and definitions .2
4 Symbols.4
5 Equipment.4
5.1 General .4
5.2 Test section support system.5
5.3 Measuring tube .5
5.4 Isolation of the test section.5
5.5 Measuring and recording devices .6
5.5.1 Measuring devices for water level.6
5.5.2 Measuring devices for flow rate.6
5.5.3 Recording devices.6
5.6 Additional equipment.6
5.7 Calibration.6
6 Planning of geohydraulic investigation and testing.6
6.1 General .6
6.2 Selection of testing locations .7
6.3 Selection of test procedure .8
6.3.1 General .8
6.3.2 Water permeability tests in a borehole using open systems.12
6.3.3 Water pressure test in rocks .12
6.3.4 Pumping tests.13
6.3.5 Infiltrometer tests .14
6.3.6 Water permeability tests in a borehole using closed systems.14
7 Preparation of the test section and installation of equipment .14
7.1 Requirements for drilling and the test sections.14
7.2 Installation of filter .15
7.3 Checking installation .15
7.4 Safety requirements.15
7.5 Decommissioning.16
7.5.1 General .16
7.5.2 Decommissioning of boreholes.16
7.5.3 Decommissioning of surface facilities.16
7.6 Factors influencing the test results.16
7.6.1 General .16
7.6.2 Viscosity of fluid.16
7.6.3 Stratification and fissures .17
7.6.4 Variable groundwater levels.17
Annex A (informative) Examples of possible test section isolation and support methods.18
Annex B (informative) Examples of shape factors .24
Bibliography.25
© ISO 2007 – All rights reserved iii
DRAFT 2008
---------------------- Page: 9 ----------------------
oSIST prEN ISO 22282-1:2008
ISO/DIS 22282-1
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
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
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
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
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.
ISO 22282-1 was prepared by Technical Committee ISO/TC 182, Geotechnics, Subcommittee SC 1, and by
Technical Committee CEN/TC 341, Geotechnical investigation and testing in collaboration.
ISO 22282 consists of the following parts, under the general title Geotechnical investigation and testing —
Geohydraulic testing:
⎯ Part 1: General rules
⎯ Part 2: Water permeability tests in a borehole using an open system
⎯ Part 3: Water pressure test in rocks
⎯ Part 4: Pumping tests
⎯ Part 5: Infiltrometer tests
⎯ Part 6: Water permeability tests in a borehole using a closed system
iv © ISO 2007 – All rights reserved
DRAFT 2008
---------------------- Page: 10 ----------------------
oSIST prEN ISO 22282-1:2008
ISO/DIS 22282-1
Introduction
The EU water directive requires the member states to increase the activities to protect groundwater and fresh
surface water both quantitatively and qualitatively. At the same time society requires more water and more
and deeper constructions below groundwater level. In addition sea level may rise as the result of climate
change. This contradiction requires engineers working on construction projects below groundwater level to
make more reliable predictions of the effects of such structures on the groundwater conditions. This can partly
be achieved by better assessment of the permeability of the ground by in-situ tests as required in EN 1997-1
Clause 3.3.9.1. According to prEN 1997-2 the following shall apply:
“2.1.4 Groundwater –
(1) Groundwater investigations shall provide all relevant information on groundwater needed for geotechnical
design and construction.
(2) Groundwater investigations should provide, when appropriate, information on:
⎯ the depth, thickness, extent and permeability of water-bearing strata in the ground, and joint systems in
rock;
⎯ the chemical composition and temperature of groundwater.
(3) The information obtained should be sufficient to assess the following aspects, where relevant:
⎯ the scope for and nature of groundwater lowering work;
⎯ possible harmful effects of the groundwater on excavations or on slopes (e.g. risk of hydraulic failure,
excessive seepage pressure or erosion);
⎯ any measures necessary to protect the structure (e.g. water proofing, drainage and measures against
aggressive water);
⎯ effects of groundwater lowering, desiccation, impounding, etc. on the surroundings;
⎯ the capacity of the ground to absorb water injected during construction work;
⎯ whether it is possible to use local groundwater, given its chemical constitution, for construction purposes.
© ISO 2007 – All rights reserved v
DRAFT 2008
---------------------- Page: 11 ----------------------
oSIST prEN ISO 22282-1:2008
---------------------- Page: 12 ----------------------
oSIST prEN ISO 22282-1:2008
prEN ISO 22282-1:2007 (E)
Geotechnical investigation and testing — Geohydraulic
testing —
Part 1:
General rules
1 Scope
This document deals with the general rules and principles for geohydraulic testing in soil and rock as
part of the geotechnical investigation services in accordance with EN 1997-1 and prEN 1997-2. It
defines concepts and specifies requirements relating to permeability measurement in soil and rock.
The different purposes of geohydraulic testing are to obtain information on the permeability of soil or
rock in natural or treated states, transmissivity and storage coefficient, and hydrodynamic parameters
of aquifers.
Geohydraulic testing is used for many purposes, such as:
a) absorption capacity and effectiveness of grouting in rock mass;
b) assessment of seepage and drainage;
c) assessment of groundwater lowering work;
d) effect of cut-offs for dams;
e) effect of tunnels shaft sinking;
f) checking fill or cover tightness
g) assessment of the flow of fluids and suspensions in the ground
h) planning of remedial measures.
NOTE 1 Geohydraulic testing for water supply is covered by ISO 14686.
NOTE 2 For most type of ground, field permeability tests yield more reliable data than those carried out in the
laboratory, because a larger volume of material is tested, and because the ground is tested in situ, thereby
including effects resulting from the structure of the ground mass but avoiding the disturbance associated with
sampling.
The document deals with the execution of tests with groundwater and does not explicitly consider
other fluids and suspensions. The flow of other fluids and suspensions can be considered by applying
the different viscosities and relations between transmissivity, permeability (hydraulic conductivity) and
absolute permeability.
2 Normative references
The following referenced documents are indispensable for the application 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.
EN 791, Drilling rigs — Safety.
© ISO 2007 – All rights reserved 1
DRAFT 2008
---------------------- Page: 13 ----------------------
oSIST prEN ISO 22282-1:2008
prEN ISO 22282-1:2007 (E)
EN 1990, Basis of Structural Design - Guidelines for implementation and application.
EN 1997-1, Eurocode 7: Geotechnical design — Part 1: General Rules.
prEN 1997-2, Eurocode 7: Geotechnical design — Part 2: Ground investigation and testing.
ISO 14686 Hydrometric determinations — Pumping tests for water wells -- Considerations and
guidelines for design, performance and use.
ISO/IEC 17025, General requirement for the competence of testing and calibration laboratories.
ISO 22475-1, Geotechnical investigation and testing — Sampling by drilling and excavation methods
and groundwater measurements — Part 1: Technical principle for execution.
ISO/TS 22475-2, Geotechnical investigation and testing — Sampling by drilling and excavation
methods and groundwater measurements — Part 2: Technical qualification criteria.
ISO/TS 22475-3, Geotechnical investigation and testing — Sampling by drilling and excavation
methods and groundwater measurements — Part 3: Conformity assessment for enterprises and
personnel.
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 1990, EN 1997-1, EN 1997-2,
and EN ISO 22475-1 and the following apply.
3.1
flow rate
The volume of water added or discharged from the test section per time unit
3.2
hydraulic head
the differential pressure between the test section and the surrounding ground, usually expressed in
terms of water level
3.3
test section
a section in a borehole where the test is carried out3.4
skin effect
the effect of the wall of the test section on the test
3.5
permeability coefficient
the flow rate divided by the area unit
NOTE The term "hydraulic conductivity" is also used synonymously for "permeability".
3.6
transmissivity
product of permeability coefficient and thickness of saturated aquifer.
3.7
storage coefficient
volume of water stored or released from a column of aquifer with unit cross section under unit
hydraulic head variation.
2 © ISO 2007 – All rights reserved
DRAFT 2008
---------------------- Page: 14 ----------------------
oSIST prEN ISO 22282-1:2008
prEN ISO 22282-1:2007 (E)
3.8
steady state
state when hydraulic head and the flow rate are constant with time
3.9
transient state prior to the steady state when the flow rate or hydraulic head are not constant with time
3.10
saturated condition
condition of the tested ground with all voids filled with water
3.11
unsaturated condition
condition of the tested ground with voids partially filled with water and partially filled with air or another
gas.
3.12
rising head test
test where the pressure or head in the test section is initially decreased and the rising is recorded
3.13
falling head test
test where the pressure or head in the test section is initially increased and the falling is recorded
3.14
variable head test
rising or falling head test
3.15
constant head test
test where the pressure or head in the test section is kept constant and the change in inflow or outflow
is recorded.
3.16
constant rate test
test where the flow rate in the test section is kept constant and change in pressure or head is recorded
3.17
mud cake
Solids deposited on the filter pack or the borehole wall.
3.18
clogging
decrease of flow rate by blocking of flow paths due to sedimentation
3.19
washing
increase of flow rate by widening or opening of flow paths due to erosion
3.20
shape factor
A model factor used for the interpretation of the test results
© ISO 2007 – All rights reserved 3
DRAFT 2008
---------------------- Page: 15 ----------------------
oSIST prEN ISO 22282-1:2008
prEN ISO 22282-1:2007 (E)
4 Symbols
Table 1 — Symbols
Symbol Designation Unit
2
A Area of the inner cross section of the casing m
c
A Area of the inner cross section of the measuring tube m²
m
2
A Area of the water surface in the reservoir m
r
D
Borehole diameter, diameter of the test section m
F Shape factor m
H Hydraulic head m
H Distance of the water surface from ground level m
0
H ,H , H
Applied hydraulic heads m
1 2 3
∆H Change in hydraulic head m
-1
k Permeability coefficient m s
K Intrinsic permeability coeeficient
L Length (height) of the test section m
p Pressure kPa
3 -1
Q flow rate m s
3 -1
Q Q Q flow rate at test 1, 2 and 3 m s
1, 2, 3
S Storage coefficient -
-1
T Transmissivity (T = k L) m² s
t Time s
t Time needed to reach the equilibrium s
i
t Time at test start s
o
3
V Volume m
η dynamic viscosity of the fluid Ns/m²
density kg/dm³
γ
5 Equipment
5.1 General
According to the different test methods, the apparatus can comprise the following elements:
⎯ test section support system;
⎯ measuring tube;
⎯ isolation of the test section;
4 © ISO 2007 – All rights reserved
DRAFT 2008
---------------------- Page: 16 ----------------------
oSIST prEN ISO 22282-1:2008
prEN ISO 22282-1:2007 (E)
⎯ measuring and recording devices;
⎯ additional equipment.
5.2 Test section support system
A system for supporting the test section shall be used for tests conducted in soil or rock which do not
maintain the geometry of the test section throughout the test.
A filter or a gravel pack may be used to support the test section. The filter pack shall be stable against
the surrounding ground and the sealing.
The filter material shall be a granular material selected to avoid plugging and/or erosion of the soil
particles from or into the surrounding ground. The permeability of the filter material shall be
considerably higher than the expected value of the permeability of the ground and shall not affect the
test results.
A chemical effect between the filter material and the water shall be avoided.
5.3 Measuring tube
A measuring tube of known cross-section should be used to connect the test section to the ground
surface. The tube shall be dimensionally stable with respect to the applied hydraulic head. The
measurement tube elements shall be chosen to give a minimum number of joints to minimize leakage.
Their diameter shall be adapted to the rate of water level variation.
A valve may be provided on this measuring tube, to allow isolation of the test section or establish
contact with the atmosphere. The closing or opening of this valve shall not induce a change in volume
which can lead to a change of the water pressure. Such changes can influence the quality of the test.
5.4 Isolation of the test section
The test section can be isolated either by
⎯ the casing;
⎯ a sealing plug;
⎯ single packer;
⎯ double or multiple packers.
NOTE see Annex B.
A packer is a high pressure expanding element which is inflated e.g by compressed air and tightly
pressed against the borehole wall to provide a seal. The sealed length shall depend on the evenness
of the borehole wall and the soil and rock type to avoid leakage around the packer and shall not be
less than 0,5 m. The effective pressure of the packer on the borehole wall shall be at least 30% higher
than the maximum test pressure.
Single packers only seal at the top of a test section while double or multiple packers also can seal at
the bottom. Special attention shall be paid to the detection of leakage of the lower packer.
The packer shall be strong enough to resist the inflating pressure with no creep and homogenous
enough to avoid any perforation of the membrane.
© ISO 2007 – All rights reserved 5
DRAFT 2008
---------------------- Page: 17 ----------------------
oSIST prEN ISO 22282-1:2008
prEN ISO 22282-1:2007 (E)
5.5 Measuring and recording devices
5.5.1 Measuring devices for water level
The changes in water levels may be measured:
⎯ by using an electrical measuring tape (water level meter);
⎯ by using a float system;
⎯ by using a pressure transducer system.
NOTE Rapid changes in depth are measured with greater accuracy with pressure sensing devices
since they are able to detect the changes more rapidly than a float. Floats lose most of their accuracy
from cable friction along the well walls.
5.5.2 Measuring devices for flow rate
The changes in flow rate shall be measured:
⎯ by using flow meter;
⎯ by using a calibrated container.
5.5.3 Recording devices
The recording shall be carried out:
⎯ manually;
⎯ analogously;
⎯ digitally.
5.6 Additional equipment
Depending on the kind of the test and the possible impact of local conditions additional equipment
shall be used in order to be able to make corrections for variations in
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.