SIST EN 14654-2:2021
(Main)Drain and sewer systems outside buildings - Management and control of activities - Part 2: Rehabilitation
Drain and sewer systems outside buildings - Management and control of activities - Part 2: Rehabilitation
This European Standard establishes requirements for the management and control of operational activities in drain and sewer systems outside buildings and specifies requirements for development and implementation of work programmes, and the selection of techniques.
This part covers the management and control of rehabilitation activities.
It is applicable to drain and sewer systems from the point where wastewater leaves a building, roof drainage system, or paved area, to the point where it is discharged into a wastewater treatment plant or receiving water body.
Drains and sewers below buildings are included provided that they do not form part of the drainage system of the building.
Entwässerungssysteme außerhalb von Gebäuden - Management und Überwachung von Maßnahmen - Teil 2: Sanierung
Dieses Dokument legt Anforderungen an das Management und an die Überwachung von Maßnahmen in Entwässerungssystemen außerhalb von Gebäuden sowie Anforderungen an die Entwicklung und Umsetzung von Arbeitsprogrammen und die Auswahl von Techniken fest.
Dieses Dokument behandelt das Management und die Überwachung von Sanierungsmaßnahmen.
Es gilt für Entwässerungssysteme ab der Stelle, an der das Abwasser ein Gebäude, eine Dachentwässerung oder eine befestigte Fläche verlässt, bis zu dem Punkt, an dem es in eine Kläranlage oder ein aufnehmendes Gewässer eingeleitet wird.
Abwasserleitungen und -kanäle unterhalb von Gebäuden sind hierbei eingeschlossen, solange sie nicht Bestandteil der Gebäudeentwässerung sind.
Réseaux d'évacuation et d'assainissement à l'extérieur des bâtiments - Gestion et contrôle des activités opérationnelles - Partie 2: Réhabilitation
Le présent document établit les prescriptions de gestion et de contrôle des activités dans les réseaux d’évacuation et d’assainissement à l’extérieur des bâtiments, et spécifie les prescriptions concernant l’élaboration et la mise en oeuvre de programmes de travaux, ainsi que le choix des techniques employées.
Le présent document traite de la gestion et du contrôle des activités de réhabilitation.
Il s’applique aux réseaux d’évacuation et d’assainissement à partir du point où les eaux usées quittent un bâtiment, un système d’évacuation de toiture ou une surface revêtue, jusqu’au point où elles se déversent dans une station d’épuration ou un milieu récepteur aquatique.
Les branchements et les collecteurs d’assainissement situés sous les bâtiments sont également visés dès l’instant qu’ils ne font pas partie du système d’évacuation propre au bâtiment.
Sistemi za odvod odpadne vode in kanalizacijo zunaj stavb - Upravljanje in nadzor aktivnosti - 2. del: Sanacija
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 14654-2:2021
01-marec-2021
Nadomešča:
SIST EN 14654-2:2013
Sistemi za odvod odpadne vode in kanalizacijo zunaj stavb - Upravljanje in nadzor
aktivnosti - 2. del: Sanacija
Drain and sewer systems outside buildings - Management and control of activities - Part
2: Rehabilitation
Entwässerungssysteme außerhalb von Gebäuden - Management und Überwachung von
Maßnahmen - Teil 2: Sanierung
Réseaux d'évacuation et d'assainissement à l'extérieur des bâtiments - Gestion et
contrôle des activités opérationnelles - Partie 2: Réhabilitation
Ta slovenski standard je istoveten z: EN 14654-2:2021
ICS:
93.030 Zunanji sistemi za odpadno External sewage systems
vodo
SIST EN 14654-2:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 14654-2:2021
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SIST EN 14654-2:2021
EN 14654-2
EUROPEAN STANDARD
NORME EUROPÉENNE
January 2021
EUROPÄISCHE NORM
ICS 93.030 Supersedes EN 14654-2:2013
English Version
Drain and sewer systems outside buildings - Management
and control of activities - Part 2: Rehabilitation
Réseaux d'évacuation et d'assainissement à l'extérieur Entwässerungssysteme außerhalb von Gebäuden -
des bâtiments - Gestion et contrôle des activités Management und Überwachung von Maßnahmen - Teil
opérationnelles - Partie 2: Réhabilitation 2: Sanierung
This European Standard was approved by CEN on 6 December 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
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 14654-2:2021 E
worldwide for CEN national Members.
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SIST EN 14654-2:2021
EN 14654-2:2021 (E)
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 General . 6
5 Integrated sewer system management planning . 6
6 Preparation of rehabilitation programme . 6
6.1 Introduction . 6
6.2 Review of the rehabilitation plan . 6
6.3 Investigation . 7
6.4 Assessment . 7
6.5 Development of the programme . 8
7 Preparation of the project specification . 14
7.1 Introduction . 14
7.2 Review of the project description and project objectives . 14
7.3 Investigation . 14
7.4 Assessment . 14
7.5 Drafting the project specification. 15
7.6 Performance indicators . 18
8 Implementation of projects . 19
8.1 Introduction . 19
8.2 Rehabilitation report . 19
9 Measurement of conformity . 19
9.1 Measuring conformity with the project specification . 19
9.2 Non-conformities . 20
9.3 Post project appraisal . 20
10 Review of plan and programme . 20
Bibliography . 21
2
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SIST EN 14654-2:2021
EN 14654-2:2021 (E)
European foreword
This document (EN 14654-2:2021) has been prepared by Technical Committee CEN/TC 165
“Wastewater Engineering”, the secretariat of which is held by DIN.
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 July 2021, and conflicting national standards shall be
withdrawn at the latest by July 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 14654-2:2013.
The changes to the text in this document are largely editorial and relate to the separation of the
duplicated text. Annex A has also been deleted as this is now incorporated into EN 752:2017. The
technical changes made is the addition of 7.5.5 on detailed design of the optimal solution.
EN 14654 consists of the following parts, under the general title Drain and sewer systems outside
buildings — Management and control of activities:
— Part 1: General
— Part 2: Rehabilitation; (the present document)
— Part 3: Drain and sewer cleaning
— Part 4: Control of inputs from users
Other parts, dealing with other activities, may be added later.
In drafting this part of EN 14654, account has been taken of other available standards, in particular
EN 752, Drain and sewer systems outside buildings and EN 13508 Investigation and assessment of drain
and sewer systems outside buildings.
According to the CEN-CENELEC Internal Regulations, the national standards organisations 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.
3
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SIST EN 14654-2:2021
EN 14654-2:2021 (E)
1 Scope
This document establishes requirements for the management and control of activities in drain and
sewer systems outside buildings and specifies requirements for development and implementation of
work programmes, and the selection of techniques.
This document covers the management and control of rehabilitation activities.
It is applicable to drain and sewer systems from the point where wastewater leaves a building, roof
drainage system, or paved area, to the point where it is discharged into a wastewater treatment plant or
receiving water body.
Drains and sewers below buildings are included provided that they do not form part of the drainage
system of the building.
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 752:2017, Drain and sewer systems outside buildings — Sewer system management
EN 13508-1:2012, Investigation and assessment of drain and sewer systems outside buildings — Part: 1:
General Requirements
EN 14654-1:2021, Drain and sewer systems outside buildings - Management and control of activities —
Part 1: General
EN 16323:2014, Glossary of wastewater engineering terms
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 16323:2014, EN 14654-1:
2021 and the following 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/
NOTE: Certain key definitions from EN 16323:2014 have been repeated below for clarity. The following
additional terms used in this document are defined in EN 16323:2014.
— drain
— sewer
— receiving water body
— surface receiving water body
— sewer system
— wastewater treatment plant
3.1
extraneous water
unwanted flow in a drain or sewer system
[SOURCE: EN 16323:2014, definition 2.1.4.7]
4
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SIST EN 14654-2:2021
EN 14654-2:2021 (E)
3.2
inspection chamber
chamber with a removable cover constructed on a drain or sewer that permits the introduction of
cleaning and inspection equipment from surface level, but does not provide access for personnel
[SOURCE: EN 16323:2014, definition 2.2.4.13]
3.3
maintenance
routine work undertaken to ensure the continuing performance of an asset
[SOURCE: EN 16323:2014, definition 2.1.6.2]
3.4
manhole
chamber with a removable cover constructed on a drain or sewer to permit entry by personnel
[SOURCE: EN 16323:2014, definition 2.2.4.15]
3.5
pipeline section
continuous section of drain or sewer between two adjacent nodes
[SOURCE: EN 16323:2014, definition 2.2.3.7]
3.6
rehabilitation
measures for restoring or upgrading the performance of existing systems, including renovation, repair
and replacement
[SOURCE: EN 16323:2014, definition 2.1.6.3]
3.7
renovation
work incorporating all or part of the original fabric of the drain or sewer by means of which its current
performance is improved
[SOURCE: EN 16323:2014, definition 2.1.6.4]
3.8
repair
rectification of local damage
[SOURCE: EN 16323:2014, definition 2.1.6.5]
3.9
replacement
construction of a new drain or sewer, on or off the line of an existing drain or sewer, the function of the
new drain or sewer incorporating that of the old
[SOURCE: EN 16323:2014, definition 2.2.1.7]
5
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SIST EN 14654-2:2021
EN 14654-2:2021 (E)
3.10
wastewater
water composed of any combination of water discharged from domestic, industrial or commercial
premises, surface run-off and accidentally any sewer infiltration water
[SOURCE: EN 16323:2014, definition 2.3.10.65]
4 General
Rehabilitation includes a wide range of activities to restore or upgrade the performance of a drain or
sewer system including those examples shown in Table 1.
Table 1 — Scope of rehabilitation
Objective Examples of system related measures Examples of component related
measures
Restore — Remove extraneous water — Cleaning
original
— … — Repair
performance
— Renovation
— Replacement (like for like).
Upgrade — Maximize use of existing flow — Replacement (increased capacity).
original capacity
performance
— Reduce hydraulic input to the drain
or sewer system
— Attenuate peak flows
— …
This document applies the process described in EN 14654-1 for implementing rehabilitation activities
in the integrated drain and sewer system management plan. This document shall be used in conjunction
with EN 14654-1.
5 Integrated sewer system management planning
Rehabilitation activities are included in the rehabilitation plan, as part of an Integrated Sewer System
Management Plan. A rehabilitation plan (see EN 752:2017, 6.4.4.4) should be in place for the drain and
sewer system prior to carrying out any rehabilitation activities. However, this is not always possible if
works are required urgently (e.g. in response to a drain or sewer failure).
6 Preparation of rehabilitation programme
6.1 Introduction
The rehabilitation programme defines a series of projects, in line with the rehabilitation plan, to ensure
that the drain and sewer system meets the performance requirements. The rehabilitation programme
should define the objectives for each project in sufficient detail so that a project specification can then
be produced in accordance with Clause 7.
6.2 Review of the rehabilitation plan
A review should be undertaken of the rehabilitation plan within the integrated sewer system
management plan.
6
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EN 14654-2:2021 (E)
6.3 Investigation
The scope of the investigations necessary to produce the rehabilitation programme will depend on the
extent of the investigations carried out during the preparation of the integrated sewer system
management plan.
Investigations shall be carried out where further information is required in order to produce the
rehabilitation programme. Examples can include:
a) further inspection in parts of the system where the original assessment was based only on sample
inspections;
b) production of more detailed sewer flow simulation models, where the original assessment was
based on a simplified model;
c) more detailed studies of the impact of any discharges on receiving water bodies.
The types of investigation can include:
1) investigations of the existing drain and sewer system (e.g. visual inspections, radar, sonar, flow
measurements, sewer flow simulation modelling, wastewater quality simulation modelling);
2) more detailed investigations of the impact of proposed new developments in the area (e.g.
hydraulic modelling etc.);
3) other investigations to determine feasibility of options (e.g. preliminary topographical, geotechnical
and other investigations (see EN 752:2017, 8.3.1).
Details of investigation techniques for existing drains and sewers are described in EN 13508-1.
6.4 Assessment
The assessment should identify the location of those components of the drains and sewer system where
proactive or reactive rehabilitation are to be carried out. This shall be based on:
a) a knowledge of the characteristics and structural condition of the drain and sewer system;
b) an understanding of existing and past failures and their association with performance deficiencies
including their impact on operations and maintenance of parts of the drain and sewer system
concerned;
c) an analysis of the performance of the drain and sewer system;
d) a review of the available information including the evolution of failures and performance
deficiencies over time.
The individual pipeline sections and other components shall be described with the existing information,
in order to optimize the rehabilitation programme.
It is advisable to carry out an analysis of the information to be able to determine:
e) the extent and the nature of the structural defects, leak tightness, hydraulic deficiencies and
mechanical damage and chemical attack (corrosion and abrasion);
f) causes of these failures and performance deficiencies;
g) environmental impacts of the defect.
7
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EN 14654-2:2021 (E)
6.5 Development of the programme
6.5.1 Introduction
The rehabilitation programme defines the activities that will be undertaken to meet the rehabilitation
objectives in the form of a series of rehabilitation projects. It defines the scope and objectives of each
rehabilitation project, the phasing of the projects and the relationship to any external constraints such
as budgets, new developments, and interactions with other utility or development programmes (e.g.
highway works).
The objectives of rehabilitation activities should be expressed through the following performance
requirements:
— hydraulic performance;
— structural performance;
— environmental performance;
— operational performance.
6.5.2 Developing options
This should include issues relating to new development and solutions involving major upgrading work
and maintenance, as well as changes to operational practices. Within this framework a number of
feasible options should be developed.
Where appropriate the options should include solutions that address a number of problems. Examples
include:
— replacement of a pipe to resolve a structural problem could also be used to resolve a hydraulic
problem on a neighbouring area by diverting flow from a neighbouring area into the new pipe;
— reduction of flows could be used both to reduce flooding and to reduce discharges from combined
sewer overflows.
The assessment of each performance deficiency identified in the rehabilitation plan should be reviewed,
taking account of the additional information collected in developing the programme (see 6.3 and 6.4).
The options should specify the group and class of solution. Examples of solutions are given in Table 2.
8
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SIST EN 14654-2:2021
EN 14654-2:2021 (E)
Table 2 — Solution types, groups and classes for rehabilitation
Type Group Class
Hydraulic Maximize use of existing Removal of constrictions.
flow capacity.
Reducing hydraulic pipeline roughness (including head
losses at structures, junctions, etc.).
Cleaning.
Source control – Diversion of surface water flows to infiltration drainage
Redu
...
SLOVENSKI STANDARD
oSIST prEN 14654-2:2019
01-julij-2019
Sistemi za odvod odpadne vode in kanalizacijo zunaj stavb - Upravljanje in nadzor
aktivnosti - 2. del: Sanacija
Drain and sewer systems outside buildings - Management and control of activities - Part
2: Rehabilitation
Entwässerungssysteme außerhalb von Gebäuden - Management und Überwachung von
Maßnahmen - Teil 2: Sanierung
Réseaux d'évacuation et d'assainissement à l'extérieur des bâtiments - Gestion et
contrôle des activités opérationnelles - Partie 2: Réhabilitation
Ta slovenski standard je istoveten z: prEN 14654-2
ICS:
93.030 Zunanji sistemi za odpadno External sewage systems
vodo
oSIST prEN 14654-2:2019 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 14654-2:2019
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oSIST prEN 14654-2:2019
DRAFT
EUROPEAN STANDARD
prEN 14654-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2019
ICS 93.030 Will supersede EN 14654-2:2013
English Version
Drain and sewer systems outside buildings - Management
and control of activities - Part 2: Rehabilitation
Réseaux d'évacuation et d'assainissement à l'extérieur Entwässerungssysteme außerhalb von Gebäuden -
des bâtiments - Gestion et contrôle des activités Management und Überwachung von Maßnahmen - Teil
opérationnelles - Partie 2: Réhabilitation 2: Sanierung
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 165.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN 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, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
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. prEN 14654-2:2019 E
worldwide for CEN national Members.
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oSIST prEN 14654-2:2019
prEN 14654-2:2019 (E)
Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 General . 7
5 Integrated sewer system management planning . 7
6 Preparation of rehabilitation programme . 7
6.1 Introduction . 7
6.2 Review of the rehabilitation plan . 7
6.3 Investigation . 8
6.4 Assessment . 8
6.5 Develop the programme . 9
6.5.1 Introduction . 9
6.5.2 Developing options . 9
6.5.3 Assess feasibility of solutions . 14
6.5.4 Select optimum solution . 14
6.5.5 Producing the programme . 14
7 Preparation of the project specification . 14
7.1 Introduction . 14
7.2 Review of the project description and project objectives . 15
7.3 Investigation . 15
7.4 Assessment . 15
7.5 Drafting the project specification. 15
7.5.1 Introduction . 15
7.5.2 Prepare detailed solutions . 15
7.5.3 Assess feasibility of solutions . 16
7.5.4 Select optimal solution . 18
7.5.5 Detailed design of optimal solution . 18
7.5.6 Prepare project specification . 18
7.6 Performance indicators . 18
7.6.1 Introduction . 18
7.6.2 Indicators for the assessment of the work quality . 19
7.6.3 Indicators for the assessment of the effectiveness of the project or programme . 19
8 Implementation of projects . 20
8.1 Introduction . 20
8.2 Rehabilitation report . 20
9 Measurement of conformity . 20
9.1 Measuring conformity with the project specification . 20
9.1.1 General . 20
9.1.2 New or replacement drains or sewers. 20
9.1.3 Renovation and repair systems . 20
9.1.4 Measuring conformity . 20
9.2 Non-conformities . 21
9.3 Post project appraisal . 21
2
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prEN 14654-2:2019 (E)
10 Review of plan and programme . 21
Bibliography . 22
3
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oSIST prEN 14654-2:2019
prEN 14654-2:2019 (E)
European foreword
This document (prEN 14654-2:2019) has been prepared by Technical Committee CEN/TC 165
“Wastewater Engineering”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 14654-2:2013.
The changes to the text in this document are largely editorial and relate to the separation of the
duplicated text. Annex A has also been deleted as this is now incorporated into EN 752:2017. The
technical changes made is the addition of 7.5.5 on detailed design of the optimal solution.
EN 14654 consists of the following parts, under the general title Drain and sewer systems outside
buildings — Management and control of activities:
— Part 1: General; (the present document)
— Part 2: Rehabilitation
— Part 3: Sewer cleaning
— Part 4: Control of inputs
Other parts, dealing with other activities, may be added later.
In drafting this part of EN 14654, account has been taken of other available standards, in particular
EN 752 “Drain and sewer systems outside buildings” and EN 13508 “Investigation and assessment of
drain and sewer systems outside buildings”.
4
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oSIST prEN 14654-2:2019
prEN 14654-2:2019 (E)
1 Scope
This document establishes requirements for the management and control of activities in drain and
sewer systems outside buildings and specifies requirements for development and implementation of
work programmes, and the selection of techniques.
This document covers the management and control of rehabilitation activities.
It is applicable to drain and sewer systems from the point where wastewater leaves a building, roof
drainage system, or paved area, to the point where it is discharged into a wastewater treatment plant or
receiving water body.
Drains and sewers below buildings are included provided that they do not form part of the drainage
system of the building.
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 752:2017, Drain and sewer systems outside buildings - Sewer system management
EN 13508-1:2012, Investigation and assessment of drain and sewer systems outside buildings - Part 1:
General Requirements
prEN 14654-1:2019, Drain and sewer systems outside buildings — Management and control of activities
— Part 1: General
EN 16323:2014, Glossary of wastewater engineering terms
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 16323:2014,
prEN 14654-1:2019 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at http://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
Note 1 to entry: Certain key definitions from EN 16323:2014 have been repeated below for clarity. The
following additional terms used in this European Standard are defined in EN 16323:2014.
— drain
— sewer
— receiving water body
— surface receiving water body
— sewer system
— wastewater treatment plant
3.1
extraneous water
unwanted flow in a drain or sewer system
[SOURCE: EN 16323:2014, definition 2.1.4.7]
5
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oSIST prEN 14654-2:2019
prEN 14654-2:2019 (E)
3.2
inspection chamber
chamber with a removable cover constructed on a drain or sewer that permits the introduction of
cleaning and inspection equipment from surface level, but does not provide access for personnel
[SOURCE: EN 16323:2014, definition 2.2.4.13]
3.3
maintenance
routine work undertaken to ensure the continuing performance of drain and sewer systems
[SOURCE: EN 16323:2014, definition 2.1.6.2]
3.4
manhole
chamber with a removable cover constructed on a drain or sewer to permit entry by personnel
[SOURCE: EN 16323:2014, definition 2.2.4.15]
3.5
pipeline section
continuous section of drain or sewer between two adjacent nodes
[SOURCE: EN 16323:2014, definition 2.2.3.7]
3.6
rehabilitation
all measures for restoring or upgrading the performance of existing drain and sewer systems
[SOURCE: EN 16323:2014, definition 2.1.6.3]
3.7
renovation
work incorporating all or part of the original fabric of the drain or sewer by means of which its current
performance is improved
[SOURCE: EN 16323:2014, definition 2.1.6.4]
3.8
repair
rectification of local damage
[SOURCE: EN 16323:2014, definition 2.1.6.5]
3.9
replacement
construction of a new drain or sewer, on or off the line of an existing drain or sewer, the function of the
new drain or sewer incorporating that of the old
[SOURCE: EN 16323:2014, definition 2.2.1.7]
6
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oSIST prEN 14654-2:2019
prEN 14654-2:2019 (E)
3.10
wastewater
water composed of any combination of water discharged from domestic, industrial or commercial
premises, surface run-off and accidentally any sewer infiltration water
[SOURCE: EN 16323:2014, definition 2.3.10.65]
4 General
Rehabilitation includes a wide range of activities to restore or upgrade the performance of a drain or
sewer system including those examples shown in Table 1.
Table 1 — Scope of rehabilitation
Objective Examples of system related measures Examples of component related
measures
Restore — Remove extraneous water — Cleaning
original
— … — Repair
performance
— Renovation
— Replacement (like for like).
Upgrade — Maximize use of existing flow — Replacement (increased capacity).
original capacity
performance
— Reduce hydraulic input to the drain
or sewer system
— Attenuate peak flows
— …
This document applies the process described in EN 14654-1 for implementing rehabilitation activities
in the integrated drain and sewer system management plan. This document shall be used in conjunction
with EN 14654-1.
5 Integrated sewer system management planning
Rehabilitation activities are included in the rehabilitation plan, as part of an Integrated Sewer System
Management Plan. A rehabilitation plan (see EN 752:2017, 6.4.4.4) should be in place for the drain and
sewer system prior to carrying out any rehabilitation activities. However, this is not always possible if
works are required urgently (e.g. in response to a drain or sewer failure).
6 Preparation of rehabilitation programme
6.1 Introduction
The rehabilitation programme defines a series of projects, in line with the rehabilitation plan, to ensure
that the drain and sewer system meets the performance requirements. The rehabilitation programme
should define the objectives for each project in sufficient detail so that a project specification can then
be produced in accordance with Clause 7.
6.2 Review of the rehabilitation plan
A review should be undertaken of the rehabilitation plan within the integrated sewer system
management plan.
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6.3 Investigation
The scope of the investigations necessary to produce the rehabilitation programme will depend on the
extent of the investigations carried out during the preparation of the integrated sewer system
management plan.
Investigations shall be carried out where further information is required in order to produce the
rehabilitation programme. Examples can include:
a) further inspection in parts of the system where the original assessment was based only on sample
inspections;
b) the production of more detailed sewer flow simulation models, where the original assessment was
based on a simplified model;
c) more detailed studies of the impact of any discharges on receiving water bodies.
The types of investigation can include:
1) investigations of the existing drain and sewer system (e.g. visual inspections, radar, sonar, flow
measurements, sewer flow simulation modelling, wastewater quality simulation modelling);
2) more detailed investigations of the impact of proposed new developments in the area (e.g.
hydraulic modelling etc.);
3) other investigations to determine feasibility of options (e.g. preliminary topographical, geotechnical
and other investigations (see EN 752:2017, 8.3.1).
Details of investigation techniques for existing drains and sewers are described in EN 13508-1.
6.4 Assessment
The assessment should identify the location of those components of the drains and sewer system where
proactive or reactive rehabilitation are to be carried out. This shall be based on:
a) a knowledge of the characteristics and structural condition of the drain and sewer system;
b) an understanding of existing and past failures and their association with performance deficiencies
including their impact on operations and maintenance of parts of the drain and sewer system
concerned;
c) an analysis of the performance of the drain and sewer system;
d) a review of the available information including the evolution of failures and performance
deficiencies over time.
The individual pipeline sections and other components shall be described with the existing information,
in order to optimize the rehabilitation programme.
It is advisable to carry out an analysis of the information to be able to determine:
a) the extent and the nature of the structural defects, leak tightness, hydraulic deficiencies and
mechanical damage and chemical attack (corrosion and abrasion);
b) the cause of these failures and performance deficiencies;
c) the environmental impact of the defect.
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6.5 Develop the programme
6.5.1 Introduction
The rehabilitation programme defines the activities that will be undertaken to meet the rehabilitation
objectives in the form of a series of rehabilitation projects. It defines the scope and objectives of each
rehabilitation project, the phasing of the projects and the relationship to any external constraints such
as budgets, new developments, and interactions with other utility or development programmes (e.g.
highway works).
The objectives of rehabilitation activities should be expressed as performance requirements:
— hydraulic performance,
— structural performance,
— environmental performance,
— operational performance.
6.5.2 Developing options
This should include issues relating to new development and solutions involving major upgrading work
and maintenance, as well as changes to operational practices. Within this framework a number of
feasible options should be developed.
Where appropriate the options should include solu
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