Geotextiles and geotextile-related products - Determination of water flow capacity in their plane - Part 1: Index test (ISO 12958-1:2020)

This document specifies a method for determining the constant-head water flow capacity within the
plane of a geotextile or geotextile-related product. This document describes the in-plane water flow
index test, only applicable to factory-assembled products. For the in-plane water flow performance test,
see ISO 12958-2.

Geotextilien und geotextilverwandte Produkte - Bestimmung des Wasserableitvermögens in der Ebene - Teil 1: Index-Prüfverfahren (ISO 12958-1:2020)

Dieses Dokument legt ein Verfahren für die Bestimmung des Wasserableitvermögens eines Geotextils oder geotextilverwandten Produktes in der Ebene bei konstanter Druckhöhe fest. Dieses Dokument beschreibt das Index-Prüfverfahren für den Wasserdurchfluss in der Ebene, welches nur für werkseitig montierte Produkte gilt. Für das Leistungs-Prüfverfahren für den Wasserdurchfluss in der Ebene siehe ISO 12958 2.

Géotextiles et produits apparentés - Détermination de la capacité de débit dans leur plan - Partie 1: Essai index (ISO 12958-1:2020)

Geotekstilije in geotekstilijam sorodni izdelki - Ugotavljanje zmogljivosti pretoka vode v ravnini - 1. del: Indeksni preskus (ISO 12958-1:2020)

General Information

Status
Published
Public Enquiry End Date
30-Jun-2019
Publication Date
16-Nov-2020
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
13-Nov-2020
Due Date
18-Jan-2021
Completion Date
17-Nov-2020

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SLOVENSKI STANDARD
SIST EN ISO 12958-1:2021
01-januar-2021
Nadomešča:
SIST EN ISO 12958:2012

Geotekstilije in geotekstilijam sorodni izdelki - Ugotavljanje zmogljivosti pretoka

vode v ravnini - 1. del: Indeksni preskus (ISO 12958-1:2020)

Geotextiles and geotextile-related products - Determination of water flow capacity in their

plane - Part 1: Index test (ISO 12958-1:2020)
Geotextilien und geotextilverwandte Produkte - Bestimmung des

Wasserableitvermögens in der Ebene - Teil 1: Index-Prüfverfahren (ISO 12958-1:2020)

Géotextiles et produits apparentés - Détermination de la capacité de débit dans leur plan

- Partie 1: Essai index (ISO 12958-1:2020)
Ta slovenski standard je istoveten z: EN ISO 12958-1:2020
ICS:
59.080.70 Geotekstilije Geotextiles
SIST EN ISO 12958-1:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 12958-1:2021
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SIST EN ISO 12958-1:2021
EN ISO 12958-1
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2020
EUROPÄISCHE NORM
ICS 59.080.70 Supersedes EN ISO 12958:2010
English Version
Geotextiles and geotextile-related products -
Determination of water flow capacity in their plane - Part
1: Index test (ISO 12958-1:2020)

Géotextiles et produits apparentés - Détermination de Geotextilien und geotextilverwandte Produkte -

la capacité de débit dans leur plan - Partie 1: Essai Bestimmung des Wasserableitvermögens in der Ebene

index (ISO 12958-1:2020) - Teil 1: Index-Prüfverfahren (ISO 12958-1:2020)
This European Standard was approved by CEN on 12 October 2020.

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-CENELEC 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-CENELEC 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, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 12958-1:2020 E

worldwide for CEN national Members.
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SIST EN ISO 12958-1:2021
EN ISO 12958-1:2020 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

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SIST EN ISO 12958-1:2021
EN ISO 12958-1:2020 (E)
European foreword

This document (EN ISO 12958-1:2020) 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 May 2021, and conflicting national standards shall be

withdrawn at the latest by May 2021.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN ISO 12958:2010.

This document has been prepared under a mandate given to CEN by the European Commission and the

European Free Trade Association.

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, Republic of

North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the

United Kingdom.
Endorsement notice

The text of ISO 12958-1:2020 has been approved by CEN as EN ISO 12958-1:2020 without any

modification.
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SIST EN ISO 12958-1:2021
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SIST EN ISO 12958-1:2021
INTERNATIONAL ISO
STANDARD 12958-1
First edition
2020-10
Geotextiles and geotextile-related
products — Determination of water
flow capacity in their plane —
Part 1:
Index test
Géotextiles et produits apparentés — Détermination de la capacité de
débit dans leur plan —
Partie 1: Essai index
Reference number
ISO 12958-1:2020(E)
ISO 2020
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SIST EN ISO 12958-1:2021
ISO 12958-1:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
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SIST EN ISO 12958-1:2021
ISO 12958-1:2020(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 .................................................................................................................................................................................................................... 6

6.1 Handling........................................................................................................................................................................................................ 6

6.2 Selection........................................................................................................................................................................................................ 6

6.3 Number and dimensions ................................................................................................................................................................ 6

6.4 Specimen condition ............................................................................................................................................................................ 7

7 Test procedure ........................................................................................................................................................................................................ 7

8 Calculations and expression of results .......................................................................................................................................... 8

8.1 Products with a continuous structure (i.e. with no discrete draining elements) .......................... 8

8.2 Products with discrete draining elements ...................................................................................................................... 8

8.3 Graphical representation ............................................................................................................................................................... 9

9 Test report ................................................................................................................................................................................................................10

Annex A (informative) Determination of the correction factor R for conversion to a water

temperature of 20 °C .....................................................................................................................................................................................11

Annex B (informative) Experimental data and calculations for a specimen ...........................................................13

Bibliography .............................................................................................................................................................................................................................14

© ISO 2020 – All rights reserved iii
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SIST EN ISO 12958-1:2021
ISO 12958-1:2020(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.

The procedures used to develop this document and those intended for its further maintenance are

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

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).

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. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/

iso/ foreword .html.

This document was prepared by Technical Committee ISO/TC 221, Geosynthetics, in collaboration with

the European Committee for Standardization (CEN) Technical Committee CEN/TC 189, Geosynthetics,

in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).

This first edition of ISO 12958-1, together with ISO 12958-2, cancels and replaces ISO 12958:2010,

which has been technically revised.
The main changes to ISO 12958:2010 are as follows:
— introduction of the concept of index versus performance test;

— permission given to test using rigid/rigid, soft/soft or soft/rigid boundaries;

— addition of guidance for testing cuspated sheets on a single side and for testing multilinear drainage

geocomposites;
— withdrawal of apparatus types b) and c);

— several cosmetic improvements, in particular terms and definitions, procedure, calculation and

reporting.
A list of all parts in the ISO 12958 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2020 – All rights reserved
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SIST EN ISO 12958-1:2021
INTERNATIONAL STANDARD ISO 12958-1:2020(E)
Geotextiles and geotextile-related products —
Determination of water flow capacity in their plane —
Part 1:
Index test
1 Scope

This document specifies a method for determining the constant-head water flow capacity within the

plane of a geotextile or geotextile-related product. This document describes the in-plane water flow

index test, only applicable to factory-assembled products. For the in-plane water flow performance test,

see ISO 12958-2.
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 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, Geosynthetics — Identification on site
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
normal compressive stress

compressive stress normal to the plane of the geotextile or geotextile-related product, expressed in

kilopascals [kPa]
3.2
in-plane flow

fluid flow within the geotextile or geotextile-related product and parallel to its plane, expressed in

litres per second [l/s]
© ISO 2020 – All rights reserved 1
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SIST EN ISO 12958-1:2021
ISO 12958-1:2020(E)
3.3
in-plane water flow capacity
p index(σ/i)

volumetric flow rate of water per unit width of specimen at a defined normal compressive stress (σ),

hydraulic gradient (i), measured in the present index test and expressed in litres per second per meter

[(l/s)/m]

Note 1 to entry: 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

two measuring points within the geotextile or geotextile-related product

Note 1 to entry: ISO/TR 18228-4 provides information on the significance of the hydraulic gradient.

3.5
contact surface
surface contacting the specimen

Note 1 to entry: Contact surfaces may be either closed-cell foam rubber on both sides (F/F), smooth rigid

membrane on one side and closed-cell foam rubber on the other side (R/F) or smooth rigid membrane on both

sides (R/R).
3.6
in-plane water flow index test
test that yields an indication of the in-plane water flow
3.7
in-plane water flow performance test

test to confirm full compliance of the in-plane water flow with the requirements under specified

conditions
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, as follows:

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 not greater than 100 mm.

b) If the average water head above the specimen exceeds 100 mm, and the applied normal load is

equal to or less than 20 kPa, the normal stress shall be corrected for the excess considering the

average water head.

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.
1) Under preparation. Stage at the time of publication: ISO/CD TR 18228-4:2020.
2 © ISO 2020 – All rights reserved
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SIST EN ISO 12958-1:2021
ISO 12958-1:2020(E)

d) The apparatus shall include a loading mechanism capable of exerting a constant normal compressive

stress on the geotextile or geotextile-related product specimen to a maximum permissible error

of ± 5 % of applied normal compressive stress.
e) The surfaces contacting the specimen should be either:

— foam rubber (F) whose properties should satisfy the compression deflection envelope,

illustrated in Figure 1, when tested in accordance with ISO 9863-1; or

— smooth rigid (R) high-density polyethylene liner 2 mm thick without any surface damage.

Performances of a geotextile-related product with any other bound
...

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