EN ISO 11275:2014

SLOVENSKI STANDARD
01-maj-2014
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Soil quality - Determination of unsaturated hydraulic conductivity and water-retention
characteristic - Wind's evaporation method (ISO 11275:2004)
Bodenbeschaffenheit - Bestimmung der ungesättigten hydraulischen Leitfähigkeit und
des Wasserrückhaltevermögens - Evaporationsverfahren nach Wind (ISO 11275:2004)
Qualité du sol - Détermination de la conductivité hydraulique en milieu non saturé et de
la caractéristique de rétention en eau - Méthode par évaporation de Wind (ISO
11275:2004)
Ta slovenski standard je istoveten z: EN ISO 11275:2014
ICS:
13.080.40 Hidrološke lastnosti tal Hydrological properties of
soils
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 11275
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2014
ICS 13.080.40
English Version
Soil quality - Determination of unsaturated hydraulic conductivity
and water-retention characteristic - Wind's evaporation method
(ISO 11275:2004)
Qualité du sol - Détermination de la conductivité Bodenbeschaffenheit - Bestimmung der ungesättigten
hydraulique en milieu non saturé et de la caractéristique de hydraulischen Leitfähigkeit und des
rétention en eau - Méthode par évaporation de Wind (ISO Wasserrückhaltevermögens - Verdunstungsverfahren nach
11275:2004) Wind (ISO 11275:2004)
This European Standard was approved by CEN on 13 March 2014.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, 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: Avenue Marnix 17, B-1000 Brussels
© 2014 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 11275:2014 E
worldwide for CEN national Members.

Contents Page
Foreword .3
Foreword
The text of ISO 11275:2004 has been prepared by Technical Committee ISO/TC 190 “Soil quality” of the
International Organization for Standardization (ISO) and has been taken over as EN ISO 11275:2014 by
Technical Committee CEN/TC 345 “Characterization of soils” the secretariat of which is held by NEN.
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 September 2014, and conflicting national standards shall be
withdrawn at the latest by September 2014.
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.
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, Former Yugoslav Republic of Macedonia, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Endorsement notice
The text of ISO 11275:2004 has been approved by CEN as EN ISO 11275:2014 without any modification.

INTERNATIONAL ISO
STANDARD 11275
First edition
2004-07-01
Corrected version
2004-11-01
Soil quality — Determination of
unsaturated hydraulic conductivity and
water-retention characteristic — Wind's
evaporation method
Qualité du sol — Détermination de la conductivité hydraulique en milieu
non saturé et de la caractéristique de rétention en eau — Méthode par
évaporation de Wind
Reference number
ISO 11275:2004(E)
©
ISO 2004
ISO 11275:2004(E)
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©
ii ISO 2004 – All rights reserved

ISO 11275:2004(E)
Contents Page
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 2
5 Principle . 3
6 Apparatus . 3
7 Procedure . 4
8 Expression of results . 9
9 Accuracy . 9
10 Test report . 9
Bibliography . 11
©
ISO 2004 – All rights reserved iii

ISO 11275:2004(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
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 11275 was prepared by Technical Committee ISO/TC 190, Soil quality, Subcommittee SC 5, Physical
methods.
This corrected version of ISO 11275:2004 incorporates the following corrections of inadvertent omissions:
a) in Equation (5) a minus sign has been added to the numerator on the right-hand side of the equation;
b) in Equation (9) a fourth term, ϕ� , has been added to the right-hand side of the equation.
i,j+1
©
iv ISO 2004 – All rights reserved

ISO 11275:2004(E)
Introduction
Soil water content and matric pressure are related to each other and determine the water-retention
characteristics of a soil. Soil water, which is in equilibrium with free water, is at zero matric pressure (or suction)
and either the soil is saturated or the gaseous phase occurs only as small bubbles. As a saturated soil dries, the
matric pressure decreases (i.e. becomes more negative), and the largest pores empty of water. Progressive
decreases in matric pressure will continue to empty finer pores until eventually water is held in only the finest
pores. Not only is water removed from soil pores, but the films of water held around soil particles are reduced in
[8],[9]
thickness. Therefore, a decreasing matric pressure is associated with decreasing soil water content .
Laboratory or field measurements of these two parameters can be made; and the relationship (which can be
reported graphically, in tabular form, or possibly as an equation) is called the soil water-retention characteristic.
The relationship extends from saturated soil to oven-dry soil (approximately 0 kPa to about −10 kPa matric
pressure).
The soil water-retention characteristic is different for each soil type. The shape and position of the curve relative
to the axes depend on soil properties such as texture, density and hysteresis associated with the wetting and
drying history. Individual points on the water-retention characteristic curve may be defined for specific purposes.
The hydraulic conductivity is a measure of the rate at which liquid water can move through the soil under the
influence of variations in matric pressure from point to point within the soil. The hydraulic conductivity of
unsaturated soil depends on the same factors as does the soil water-retention characteristic, also showing
hysteresis. As a saturated soil dries, the hydraulic conductivity decreases, and it is convenient to express the
hydraulic conductivity corresponding to the soil water-retention characteristic as a function of the decreasing
matrix pressure.
The results obtained using these methods can be used, for example:
— to provide an assessment of the equivalent pore-size distribution (e.g. identification of macro- and micro-
pores);
— to determine indices of plant-available water in the soil and to classify soil accordingly (e.g. for irrigation
purposes);
— to determine the drainable pore space (e.g. for drainage design, pollution risk assessments);
— to monitor changes in the structure of a soil (caused by e.g. tillage, compaction or addition of organic matter
or synthetic soil conditioners);
— to ascertain the relationship between the negative matric pressure and other soil physical properties (e.g.
hydraulic conductivity, thermal conductivity);
— to determine water content at specific negative matric pressures (e.g. for microbiological degradation
studies);
— to estimate other soil physical properties.
©
ISO 2004 – All rights reserved v

.
vi
INTERNATIONAL STANDARD ISO 11275:2004(E)
Soil quality — Determination of unsaturated hydraulic
conductivity and water-retention characteristic — Wind's
evaporation method
1Scope
This International Standard specifies a laboratory method for the simultaneous determination in soils of the
unsaturated hydraulic conductivity and of the soil water-retention characteristic. It is applicable only to
measurement of the drying or desorption curve. Application of the method is restricted to soil samples which
are, as far as possible, homogeneous. The method is not applicable to soils which shrink in the range of matric
head h = 0cmto h =−800 cm.
m m
The range of the determination of the conductivity depends on the soil type. It lies between matric heads of
approximately h =−50 cmand h =−700 cm.
m m
The range of the determination of the water-retention characteristic lies betw
...