CEN/TS 17445:2021

Geosynthetics - Standard test for the simulation of rainfall-induced erosion on the surface of a slope protected by geosynthetic erosion control products

This document specifies an index test method for the simulation of rainfall-induced erosion on the surface of a slope protected by geosynthetic erosion control products.
The test is normally carried out on specimens conditioned under a specified atmosphere.
The test is applicable to most geosynthetics, but is especially suited to geosynthetic erosion control products.

Geokunststoffe - Prüfverfahren zur Simulation von durch Niederschlag hervorgerufener Erosion an geosynthetischen Erosionsschutzprodukten

Dieses Dokument legt ein Indexprüfverfahren zur Simulation von durch Niederschlag hervorgerufener Erosion auf einer durch geosynthetische Erosionsschutzprodukte geschützten Böschungsoberfläche fest.
Die Prüfung wird gewöhnlich an in einer festgelegten Atmosphäre konditionierten Messproben durchgeführt.
Die Prüfung ist auf die meisten Geokunststoffe anwendbar, aber besonders für geosynthetische Erosionsschutzprodukte geeignet.

Géosynthétiques - Essai normalisé de simulation de l’érosion induite par la pluie à la surface d’une pente protégée par des produits géosynthétiques de lutte contre l’érosion

Le présent document spécifie une méthode d’essai de référence pour la simulation de l’érosion induite par la pluie à la surface d’une pente protégée par des produits géosynthétiques de lutte contre l’érosion.
L’essai est normalement réalisé sur des éprouvettes conditionnées dans une atmosphère spécifiée.
L’essai s’applique à la plupart des géosynthétiques, mais convient particulièrement aux produits géosynthétiques de lutte contre l’érosion.

Geosintetika - Standardni preskus za simulacijo erozije, ki jo povzroči dež, na površini pobočja, zaščitenega z geosintetičnimi izdelki za nadzor erozije

General Information

• Status: Published
• Publication Date: 16-Mar-2021
• ICS: 59.080.70 - Geotextiles
• Technical Committee: CEN/TC 189 - Geotextiles and geotextile-related products
• Drafting Committee: CEN/TC 189/WG 4 - Hydraulic testing
• 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-TS CEN/TS 17445:2021 - Geosynthetics - Standard test for the simulation of rainfall-induced erosion on the surface of a slope protected by geosynthetic erosion control products

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2021
Geosintetika - Standardni preskus za simulacijo erozije, ki jo povzroči dež, na
površini pobočja, zaščitenega z geosintetičnimi izdelki za nadzor erozije
Geosynthetics - Standard test for the simulation of rainfall-induced erosion on the
surface of a slope protected by geosynthetic erosion control products
Geokunststoffe - Prüfverfahren zur Simulation von durch Niederschlag hervorgerufener
Erosion an geosynthetischen Erosionsschutzprodukten
Géosynthétiques - Essai normalisé de simulation de l’érosion induite par la pluie à la
surface d’une pente protégée par des produits géosynthétiques de lutte contre l’érosion
Ta slovenski standard je istoveten z: CEN/TS 17445:2021
ICS:
59.080.70 Geotekstilije Geotextiles
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

CEN/TS 17445
TECHNICAL SPECIFICATION
SPÉCIFICATION TECHNIQUE
March 2021
TECHNISCHE SPEZIFIKATION
ICS 59.080.70
English Version
Geosynthetics - Standard test for the simulation of rainfall-
induced erosion on the surface of a slope protected by
geosynthetic erosion control products
Géosynthétiques - Essai normalisé de simulation de Geokunststoffe - Prüfverfahren zur Simulation von
l'érosion induite par la pluie à la surface d'une pente durch Niederschlag hervorgerufener Erosion an
protégée par des produits géosynthétiques de lutte geosynthetischen Erosionsschutzprodukten
contre l'érosion
This Technical Specification (CEN/TS) was approved by CEN on 11 January 2021 for provisional application.

The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to
submit their comments, particularly on the question whether the CEN/TS can be converted into a European Standard.

CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS
available promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in
parallel to the CEN/TS) until the final decision about the possible conversion of the CEN/TS into an EN is reached.

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
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 17445:2021 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Principle . 7
5 Apparatus . 7
5.1 Slope simulator . 7
5.2 Runoff and Sediment Collection System . 8
5.3 Rainfall simulator . 8
5.3.1 General. 8
5.3.2 Water source . 8
5.4 Disdrometer . 9
6 Soil . 9
7 Specimens . 9
8 Conditioning . 10
9 Calibration . 10
9.1 Setting the rainfall intensity gauges. 10
9.1.1 General. 10
9.2 Rainfall intensity calibration . 10
9.3 Disdrometer preparation . 10
9.4 Rainfall calibration . 11
9.5 Recording of data . 11
9.6 Calculation and expression of results . 11
9.7 Calculate the theoretical values. 12
9.7.1 Calculate the theoretical value. 12
9.7.2 Calculate the theoretical Kinetic Energy . 12
9.7.3 Calculate the terminal velocity vt . 12
9.8 Calibration check . 12
9.8.1 The apparatus shall be considered as satisfactorily calibrated if . 12
9.8.2 The apparatus is considered satisfactorily calibrated . 12
9.8.3 The apparatus is not considered satisfactorily calibrated . 12
9.9 Calibration Frequency . 13
10 Procedure . 13
10.1 Slope simulator preparation . 13
10.2 Rainfall simulator preparation . 14
10.3 Test Operation and Data Collection . 14
11 Test report . 15
11.1 Pre-Test Documentation . 15
11.2 The test report shall include the following information . 15
Annex A (informative) Typical apparatus . 25
Annex B (informative) Modifications to the standard procedure . 28
Annex C (informative) Calculation and expression of results . 29
Annex D (informative) Evaluation of the C Factor of RUSLE (Revised Universal Soil Loss
Equation) . 31
Bibliography . 35

European foreword
This document (CEN/TS 17445:2021) has been prepared by Technical Committee CEN/TC 189
“Geosynthetics”, the secretariat of which is held by NBN.
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.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to announce this Technical Specification: 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.
1 Scope
This document specifies an index test method for the simulation of rainfall-induced erosion on the
surface of a slope protected by geosynthetic erosion control products.
The test is normally carried out on specimens conditioned under a specified atmosphere.
The test is applicable to most geosynthetics, but is especially suited to geosynthetic erosion control
products.
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.
EN 13286-2, Unbound and hydraulically bound mixtures - Part 2: Test methods for laboratory reference
density and water content - Proctor compaction
EN ISO 9862, Geosynthetics - Sampling and preparation of test specimens (ISO 9862)
EN ISO 10318-1, Geosynthetics - Part 1: Terms and definitions (ISO 10318-1)
EN ISO 11074, Soil quality - Vocabulary (ISO 11074)
EN ISO 14688-1, Geotechnical investigation and testing - Identification and classification of soil - Part 1:
Identification and description (ISO 14688-1)
ISO 554, Standard atmospheres for conditioning and/or testing - Specifications
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN ISO 10318-1, EN ISO 14688-1,
EN ISO 11074, and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp/ui
3.1
disdrometer
laser-optical source that produces a parallel light-beam
Note 1 to entry: The instrument determines the size and fall speed of rain drops by measuring the signal
reduction caused by the drop falling through the light-beam; the amplitude and duration of the reduced signal is
used to estimate the drop size and fall speed, respectively
3.2
test series
test repetitions including at least one test with and without geosynthetic specimens placed in the test
box
3.3
N
total number of detected raindrops
3.4
n
i
number of detected raindrops in the size class i
3.5
D [mm]
mean
mean drop diameter
3.6
D [mm]
i
drop diameter at the middle of the size class i
3.7
D [mm]
spherical equivalent diameter of the raindrops
3.8
v [m/s]
mean
mean fall velocity
3.9
n
j
number of detected raindrops in the fall velocity class j
3.10
v [m/s]
j
fall velocity at the middle of the fall velocity class j
3.11
R [mm/h]
rainfall intensity
3.12
R(Di) [mm/h]
rainfall intensity for a given drop size class i
3.13
A [m ]
disdrometer detection area
3.14
KE [J/(m mm)]
kinetic energy of the simulated rain
3.15
−6 3
ρ (10 kg/mm )
water density
3.16
D [mm]
LP
expected value of mean drop diameter according to Laws and Parsons (1943)
3.17
KE [J/(m mm)]
e
expected kinetic energy according to Renard et al. (1997)
3.18
vt (m/s)
terminal velocity of rain drops in still air
4 Principle
The specimen is placed on an inclined steel b
...