EN ISO 11058:2019

Geotextiles and geotextile-related products - Determination of water permeability characteristics normal to the plane, without load (ISO 11058:2019)

This document specifies two test methods for determining the water permeability characteristics of a single layer of geotextile or geotextile-related product normal to the plane:
a)    the constant head method; and
b)    the falling head method.

Geotextilien und geotextilverwandte Produkte - Bestimmung der Wasserdurchlässigkeitseigenschaften normal zur Ebene, ohne Auflast (ISO 11058:2019)

Dieses Dokument legt zwei Prüfverfahren zur Bestimmung der charakteristischen Wasserdurchlässigkeit eines einlagigen Geotextils oder geotextilverwandten Produktes normal zu seiner Ebene fest:
a)   das Verfahren mit konstanter Druckhöhe; und
b)   das Verfahren mit fallender Druckhöhe.

Géotextiles et produits apparentés - Détermination des caractéristiques de perméabilité à l'eau normalement au plan, sans contrainte mécanique (ISO 11058:2019)

Le présent document décrit deux méthodes d'essai pour déterminer la perméabilité à l'eau d'une couche d'un géotextile ou produit apparenté normalement à son plan:
a)    la méthode à hauteur de charge constante; et
b)    la méthode avec hauteur de charge variable décroissante.

Geotekstilije in geotekstilijam sorodni izdelki - Ugotavljanje prepustnosti za vodo pravokotno na ravnino, brez obremenitve (ISO 11058:2019)

Ta dokument določa metodi za ugotavljanje prepustnosti za vodo
ene plasti geotekstilije ali geotekstilijam sorodnega izdelka pravokotno na ravnino:
a) metoda s stalnim hidravličnim padcem; in
b) metoda s padajočim hidravličnim padcem.

General Information

• Status: Published
• Publication Date: 25-Jun-2019
• Withdrawal Date: 30-Dec-2019
• ICS: 59.080.70 - Geotextiles
• Technical Committee: CEN/TC 189 - Geotextiles and geotextile-related products
• Drafting Committee: CEN/TC 189/WG 4 - Hydraulic testing
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 26-Jun-2019
• Completion Date: 26-Jun-2019
• Directive: 305/2011 - Regulation (eu) No 305/2011 of the European Parliament and of the Council of 9 march 2011 laying down harmonised conditions for the marketing of construction products and repealing council directive 89/106/eec
• Mandate: M/107 - Mandate to CEN/CENELEC concerning the execution of standardization work for harmonized standards on geotextiles
• Ref Project: SIST EN ISO 11058:2019 - Geotextiles and geotextile-related products - Determination of water permeability characteristics normal to the plane, without load (ISO 11058:2019)

Relations

• Replaces: EN ISO 11058:2010 - Geotextiles and geotextile-related products - Determination of water permeability characteristics normal to the plane, without load (ISO 11058:2010)
• Effective Date: 03-Jul-2019

Overview

EN ISO 11058:2019 (ISO 11058:2019) specifies laboratory test methods to determine the water permeability characteristics of a single layer of geotextile or geotextile-related product normal to the plane, without load. The standard describes two complementary procedures - the constant head method and the falling head method - and defines reporting and calculation conventions (including the velocity index).

Key topics and technical requirements

• Test methods
  • Constant head method: unidirectional flow under a maintained head; suitable apparatus must observe air bubbles and maintain heads up to at least 70 mm.
  • Falling head method: transient head decay measurement (details, apparatus and calculation procedures provided).
• Specimen handling and sampling
  • Specimens must be taken and prepared in accordance with ISO 9862; avoid folding and disturbance; typically five specimens are tested unless statistical requirements demand more (ISO 2854).
• Apparatus and measurement
  • Apparatus internal diameter minimum 50 mm; exposed specimen diameter must match apparatus; supporting grids allowed to avoid deformation.
  • Water quality/condition: temperature 18–22 °C (temperature correction given in Annex A), dissolved oxygen ≤ 10 mg/kg, de-aired or from a stilling tank recommended to prevent entrapped air. Filtration if visible suspended solids occur.
  • Measurement instruments: thermometer, stopwatch, measuring vessel or flow gauge; accuracy requirements are specified.
• Parameters and reporting
  • Velocity index (v‑index): velocity corresponding to a 50 mm head loss, expressed to nearest ±1 mm/s.
  • Annexes cover temperature correction, the relationship between head loss and flow velocity, reference velocity index values, and worked examples.

Applications

EN ISO 11058:2019 is used to characterize the through-thickness hydraulic behavior of geotextiles and related products for:

• Drainage and filtration layer design in roadworks, rail, and retaining structures
• Landfill drainage and leachate collection systems
• Erosion control and hydraulic structures where normal-to-plane permeability affects performance
• Quality control during manufacture and verification testing for construction specifications

Who uses this standard

• Geosynthetics and geotextile manufacturers for product development and QC
• Independent testing laboratories performing permeability/permeation tests
• Geotechnical and civil engineers specifying materials for drainage and filtration
• Contractors and asset owners verifying compliance with project specifications

Related standards

• ISO 9862 - Sampling and preparation of geosynthetic test specimens
• ISO 2854 - Statistical interpretation of data (means and variances)
• ISO 5813 - Measurement of dissolved oxygen (referred for water quality)

Keywords: EN ISO 11058:2019, ISO 11058:2019, geotextile permeability, water permeability normal to plane, constant head, falling head, velocity index, geosynthetics testing.

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2019
Nadomešča:
SIST EN ISO 11058:2011
Geotekstilije in geotekstilijam sorodni izdelki - Ugotavljanje prepustnosti za vodo
pravokotno na ravnino, brez obremenitve (ISO 11058:2019)
Geotextiles and geotextile-related products - Determination of water permeability
characteristics normal to the plane, without load (ISO 11058:2019)
Geotextilien und geotextilverwandte Produkte - Bestimmung der Wasserdurchlässigkeit
normal zur Ebene, ohne Auflast (ISO 11058:2019)
Géotextiles et produits apparentés - Détermination des caractéristiques de perméabilité
à l'eau normalement au plan, sans contrainte mécanique (ISO 11058:2019)
Ta slovenski standard je istoveten z: EN ISO 11058:2019
ICS:
59.080.70 Geotekstilije Geotextiles
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 11058
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2019
EUROPÄISCHE NORM
ICS 59.080.70 Supersedes EN ISO 11058:2010
English Version
Geotextiles and geotextile-related products -
Determination of water permeability characteristics
normal to the plane, without load (ISO 11058:2019)
Géotextiles et produits apparentés - Détermination des Geotextilien und geotextilverwandte Produkte -
caractéristiques de perméabilité à l'eau normalement Bestimmung der Wasserdurchlässigkeit normal zur
au plan, sans contrainte mécanique (ISO 11058:2019) Ebene, ohne Auflast (ISO 11058:2019)
This European Standard was approved by CEN on 24 May 2019.

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
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 11058:2019 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 11058:2019) 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 December 2019, and conflicting national standards
shall be withdrawn at the latest by December 2019.
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 11058:2010.
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 11058:2019 has been approved by CEN as EN ISO 11058:2019 without any modification.

INTERNATIONAL ISO
STANDARD 11058
Third edition
2019-05
Geotextiles and geotextile-related
products — Determination of water
permeability characteristics normal to
the plane, without load
Géotextiles et produits apparentés — Détermination des
caractéristiques de perméabilité à l'eau normalement au plan, sans
contrainte mécanique
Reference number
ISO 11058:2019(E)
©
ISO 2019
ISO 11058:2019(E)
© ISO 2019
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: [phone]
Fax: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved

ISO 11058:2019(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Test specimens. 1
4.1 Handling. 1
4.2 Selection. 1
4.3 Number and dimensions . 2
4.4 Specimen conditions . 2
5 Constant head method . 2
5.1 Principle . 2
5.2 Apparatus . 2
5.3 Procedure . 3
5.4 Calculation and expression of results. 4
6 Falling head method . 4
6.1 Principle . 4
6.2 Apparatus . 5
6.3 Procedure . 6
6.4 Calculation and expression of results. 6
7 Test report . 7
Annex A (informative) Determination of the correction factor, R , to a water temperature of
T
20 °C .11
Annex B (normative) Relationship between head loss and flow velocity .13
Annex C (informative) Individual velocity index values for a head loss of 50 mm .15
Annex D (informative) Experimental data and calculations .16
ISO 11058:2019(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.
This third edition cancels and replaces the second edition (ISO 11058:2010), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— editorial modifications;
— formula corrections.
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 2019 – All rights reserved

INTERNATIONAL STANDARD ISO 11058:2019(E)
Geotextiles and geotextile-related products —
Determination of water permeability characteristics
normal to the plane, without load
1 Scope
This document specifies two test methods for determining the water permeability characteristics of a
single layer of geotextile or geotextile-related product normal to the plane:
a) the constant head method; and
b) the falling head method.
2 Normative references
The following referenced documents are referred to 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 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
velocity index
v-index
velocity corresponding to a head loss of 50 mm across a specimen, expressed to the nearest ±1 mm/s
4 Test specimens
4.1 Handling
The sample shall not be folded and shall be handled as infrequently as possible to avoid disturbance to
its structure. The sample shall be kept in a flat position without any load.
4.2 Selection
Test specimens shall be taken from the sample in accordance with ISO 9862.
ISO 11058:2019(E)
4.3 Number and dimensions
Five test specimens shall be cut from the sample, each of suitable dimensions for the water permeability
apparatus to be used.
If it is necessary to determine the results to within a given confidence interval of the mean, the number
of test specimens shall be determined in accordance with ISO 2854.
4.4 Specimen conditions
The specimens shall be clean, free from surface deposits and without visible damage or folding marks.
5 Constant head method
5.1 Principle
A single, unloaded layer of geotextile or geotextile-related product is subjected to a unidirectional flow
of water normal to the plane under a range of constant heads.
5.2 Apparatus
5.2.1 Apparatus in which it is possible to observe the presence of air bubbles on the surface of
the specimen, with an internal diameter of minimum 50 mm, conforming to the following requirements.
a) The apparatus shall be capable of applying a maximum head loss of at least 70 mm and maintaining
a constant head for the duration of each test with water on both sides of the specimen.
NOTE Some examples of apparatus are shown in Figure 1.
b) The mean internal diameter of the apparatus shall be known to an accuracy of at least 0,1 mm. The
exposed diameter of the specimen shall be the same as the internal diameter of the apparatus. The
diameter of the apparatus shall remain identical on both sides of the specimen over a length of at
least twice its internal diameter [see Figures 1 a) and 1 b)]. Abrupt changes in diameter shall be
avoided.
Alternatively [see Figure 1 c)], the outflow may discharge into a reservoir with a diameter of at
least four times the exposed diameter of the specimen. In this case, the distance from the geotextile
to the base of the reservoir shall be at least 1,5 times the exposed diameter of the specimen.
If the product shows an obvious pattern, this pattern shall be included at least three times along
any diameter of the specimen.
c) Where necessary, to avoid any visible deformation, a grid of 1 mm diameter wire and a mesh size of
(10 ± 1) mm shall be placed downstream of the specimen to support it during the test.
d) The head loss measured at any velocity when a test is performed without the test specimen, but
including any specimen-supporting grid, shall be less than 1 mm.
5.2.2 Water supply, of the following quality and condition.
a) The water shall be at a temperature of between 18 °C and 22 °C.
As the temperature correction (see Annex A) relates only to laminar flow, it is advisable to work at
temperatures as close as possible to 20 °C to minimize inaccuracies associated with inappropriate
correction factors, should the flow be non-laminar.
b) Water shall not be fed into the apparatus directly from a main supply due
...