EN ISO 12958:2010

SLOVENSKI STANDARD
01-januar-2012
1DGRPHãþD
SIST EN ISO 12958:1999
Geotekstilije in geotekstilijam sorodni izdelki - Ugotavljanje zmogljivosti pretoka
vode v ravnini (ISO 12958:2010)
Geotextiles and geotextile-related products - Determination of water flow capacity in their
plane (ISO 12958:2010)
Geotextilien und geotextilverwandte Produkte - Bestimmung des
Wasserableitvermögens in der Ebene (ISO 12958:2010)
Géotextiles et produits apparentés - Détermination de la capacité de débit dans leur plan
(ISO 12958:2010)
Ta slovenski standard je istoveten z: EN ISO 12958:2010
ICS:
59.080.70 Geotekstilije Geotextiles
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 12958
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2010
ICS 59.080.70 Supersedes EN ISO 12958:1999
English Version
Geotextiles and geotextile-related products - Determination of
water flow capacity in their plane (ISO 12958:2010)
Géotextiles et produits apparentés - Détermination de la Geotextilien und geotextilverwandte Produkte -
capacité de débit dans leur plan (ISO 12958:2010) Bestimmung des Wasserableitvermögens in der Ebene
(ISO 12958:2010)
This European Standard was approved by CEN on 8 March 2010.

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. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN Management Centre or to any CEN member.

This European Standard 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 CEN Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, 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.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2010 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 12958:2010: E
worldwide for CEN national Members.

Contents Page
Foreword .3

Foreword
This document (EN ISO 12958:2010) has been prepared by Technical Committee ISO/TC 221
"Geosynthetics" in collaboration with Technical Committee CEN/TC 189 “Geosynthetics” the secretariat of
which is held by NBN.
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 October 2010, and conflicting national standards shall be withdrawn at
the latest by October 2010.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 12958:1999.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, 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 the United Kingdom.
Endorsement notice
The text of ISO 12958:2010 has been approved by CEN as a EN ISO 12958:2010 without any modification.

INTERNATIONAL ISO
STANDARD 12958
Second edition
2010-04-15
Geotextiles and geotextile-related
products — Determination of water flow
capacity in their plane
Géotextiles et produits apparentés — Détermination de la capacité de
débit dans leur plan
Reference number
ISO 12958:2010(E)
©
ISO 2010
ISO 12958:2010(E)
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ii © ISO 2010 – All rights reserved

ISO 12958:2010(E)
Contents Page
Foreword .iv
1 Scope.1
2 Normative references.1
3 Terms and definitions .1
4 Principle.2
5 Apparatus and materials.2
6 Specimens.5
6.1 Handling .5
6.2 Selection.5
6.3 Number and dimensions.5
6.4 Specimen condition .6
7 Test procedure.6
8 Calculations and expression of results .7
9 Test report.8
Annex A (informative) Determination of the correction factor R for conversion to a water
T
temperature of 20 °C .10
Annex B (informative) Experimental data and calculations for a specimen.12
Bibliography.13

ISO 12958:2010(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 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 12958 was prepared by Technical Committee ISO/TC 221, Geosynthetics.
This second edition cancels and replaces the first edition (ISO 12958:1999), which has been technically
revised.
iv © ISO 2010 – All rights reserved

INTERNATIONAL STANDARD ISO 12958:2010(E)

Geotextiles and geotextile-related products — Determination of
water flow capacity in their plane
1 Scope
This International Standard specifies a method for determining the constant-head water flow capacity within
the plane of a geotextile or geotextile-related product.
NOTE 1 If the full water flow capacity characteristics of the geotextile or geotextile-related product have previously
been established, then for control purposes it can be sufficient to determine the water flow capacity at two loads and both
gradients.
NOTE 2 The compressibility of the product over time will substantially influence the in-plane water flow capacity. Test
methods for assessing the compressive creep behaviour of geotextiles or geotextile-related products are described in
ISO 25619-1.
The test report is judged in conjunction with the long-term compressive creep behaviour in order to assess the
long-term flow capacity.
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.
ISO 2854, Statistical interpretation of data — Techniques of estimation and tests relating to means and
variances
ISO 5813, Water quality — Determination of dissolved oxygen — Iodometric method
ISO 9862, Geosynthetics — Sampling and preparation of test specimens
ISO 9863-1, Geosynthetics — Determination of thickness at specified pressures — Part 1: Single layers
ISO 10320, Geotextiles and geotextile-related products — Identification on site
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
normal compressive stress
compressive stress components normal to the plane of the geotextile or geotextile-related product
NOTE The normal compressive stress is expressed in kilopascals.
3.2
in-plane flow
fluid flow within the geotextile or geotextile-related product and parallel to its plane
ISO 12958:2010(E)
3.3
in-plane water flow capacity
volumetric flow rate of water per unit width of specimen at a defined gradient and load
NOTE The term transmissivity is related to laminar flow conditions only and equals the water flow capacity at a
hydraulic gradient equal to unity. As non-laminar flow may occur, the term water flow capacity is preferred.
3.4
hydraulic gradient
ratio of the head loss in the geotextile or geotextile-related product specimen to the distance between the
measuring points
4 Principle
The flow of water within the plane of a geotextile or geotextile-related product is measured under varying
normal compressive stresses, with typical hydraulic gradients and with defined contact surfaces.
5 Apparatus and materials
5.1 Constant-head in-plane water flow apparatus, satisfying the following requirements:
a) The apparatus shall be capable of maintaining a constant head loss at different water levels, at least
those corresponding to hydraulic gradients of 0,1 and 1,0, while maintaining a water head at the point of
discharge of not greater than 100 mm.
b) If the water head exceeds 100 mm, the normal stress shall be corrected for the excess.
c) The apparatus shall be capable of maintaining the proposed normal compressive stress on the specimen
without any deformation which would influence the test results.
d) The apparatus shall include a loading mechanism capable of exerting a constant normal compressive
stress on the geotextile specimen to an accuracy of ±5 %.
e) The surfaces contacting the specimen shall be closed-cell fo
...