EN 752:2008

Drain and sewer systems outside buildings

This European Standard sets out the objectives for drain and sewer systems outside buildings.  It specifies the functional requirements for achieving these objectives and the principles for strategic and policy activities relating to planning, design, installation, operation, maintenance and rehabilitation.
It is applicable to drain and sewer systems, which operate essentially under gravity, 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.
Drains and sewers below buildings are included provided that they do not form part of the drainage system for the building.

Entwässerungssysteme außerhalb von Gebäuden

Diese Europäische Norm legt Ziele für Entwässerungssysteme außerhalb von Gebäuden fest. Sie legt Funktionsanforderungen zum Erreichen dieser Ziele fest sowie Grundsätze für Strategie und Vorgehensweise in Bezug auf Planung, Bemessung, Bau, Betrieb, Unterhalt und Sanierung.
Sie gilt für Entwässerungssysteme, welche hauptsächlich als Freispiegelsysteme betrieben werden, von dem Punkt an, wo das Abwasser das Gebäude bzw. die Dachentwässerung verlässt oder in einen Straßenablauf fließt, bis zu dem Punkt, wo das Abwasser in eine Kläranlage oder einen Vorfluter 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

La présente Norme européenne définit les objectifs des réseaux d’évacuation et d’assainissement à l’extérieur des bâtiments. Elle spécifie les prescriptions de fonctionnement permettant d’atteindre ces objectifs ainsi que les principes des activités stratégiques et politiques liées à la planification, à la conception, à l’installation, au fonctionnement, à l’entretien et à la réhabilitation.
Elle s’applique aux réseaux d’évacuation et d’assainissement, principalement les réseaux gravitaires, 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 collecteurs situés sous des bâtiments sont inclus, à condition qu’ils ne fassent pas partie du réseau d’évacuation du bâtiment.

Sistemi za odvod odpadne vode in kanalizacijo zunaj zgradb

General Information

• Status: Withdrawn
• Publication Date: 22-Jan-2008
• Withdrawal Date: 13-Apr-2025
• ICS: 23.040.05 - Pipeline and its parts for external sewage systems
• ICS: 93.030 - External sewage systems
• Technical Committee: CEN/TC 165 - Waste water engineering
• Drafting Committee: CEN/TC 165/WG 22 - Drainage outside buildings
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Start Date: 26-Apr-2017
• Completion Date: 14-Apr-2025
• Ref Project: SIST EN 752:2009 - Drain and sewer systems outside buildings

Relations

• Replaces: EN 752-2:1996 - Drain and sewer systems outside buildings - Part 2: Performance requirements
• Effective Date: 22-Dec-2008
• Replaces: EN 752-5:1997 - Drain and sewer systems outside buildings - Part 5: Rehabilitation
• Effective Date: 22-Dec-2008
• Replaces: EN 752-1:1995 - Drain and sewer systems outside buildings - Part 1: Generalities and definitions
• Effective Date: 22-Dec-2008
• Replaces: EN 752-4:1997 - Drain and sewer systems outside buildings - Part 4: Hydraulic design and environmental considerations
• Effective Date: 22-Dec-2008
• Replaces: EN 752-7:1998 - Drain and sewer systems outside buildings - Part 7: Maintenance and operations
• Effective Date: 22-Dec-2008
• Replaces: EN 752-6:1998 - Drain and sewer systems outside buildings - Part 6: Pumping installations
• Effective Date: 22-Dec-2008
• Replaces: EN 752-3:1996 - Drain and sewer systems outside buildings - Part 3: Planning
• Effective Date: 22-Dec-2008
• Replaced By: EN 752:2017 - Drain and sewer systems outside buildings - Sewer system management
• Effective Date: 03-May-2017

Standards Content (Sample)

SLOVENSKI STANDARD
01-januar-2009
1DGRPHãþD
SIST EN 752-1:1996
SIST EN 752-2:1996
SIST EN 752-3:1996
SIST EN 752-4:1998
SIST EN 752-5:1998
SIST EN 752-6:1998
SIST EN 752-7:1998
Sistemi za odvod odpadne vode in kanalizacijo zunaj zgradb
Drain and sewer systems outside buildings
Entwässerungssysteme außerhalb von Gebäuden
Réseaux d'évacuation et d'assainissement a l'extérieur des bâtiments
Ta slovenski standard je istoveten z: EN 752:2008
ICS:
93.030 Zunanji sistemi za odpadno External sewage systems
vodo
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 752
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2008
ICS 93.030 Supersedes EN 752-1:1995, EN 752-2:1996, EN 752-
3:1996, EN 752-4:1997, EN 752-5:1997, EN 752-6:1998,
EN 752-7:1998
English Version
Drain and sewer systems outside buildings
Réseaux d'évacuation et d'assainissement à l'extérieur des Entwässerungssysteme außerhalb von Gebäuden
bâtiments
This European Standard was approved by CEN on 24 November 2007.
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 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 Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 752:2008: E
worldwide for CEN national Members.

Contents Page
Foreword.7
1 Scope.10
2 Normative references.10
3 Terms and definitions .11
4 Objectives.19
4.1 General.19
4.2 Public Health and Safety.20
4.3 Occupational Health and Safety.20
4.4 Environmental Protection.20
4.5 Sustainable Development.20
5 Requirements.21
5.1 Functional Requirements.21
5.1.1 Introduction.21
5.1.2 Protection from flooding.22
5.1.3 Maintainability.22
5.1.4 Protection of surface receiving waters .22
5.1.5 Protection of groundwater.22
5.1.6 Prevention of odours and toxic, explosive and corrosive gases .23
5.1.7 Prevention of noise and vibration.23
5.1.8 Sustainable use of products and materials .23
5.1.9 Sustainable use of energy .23
5.1.10 Structural integrity and design life .23
5.1.11 Maintaining the flow .23
5.1.12 Watertightness.23
5.1.13 Not endangering adjacent structures and utility services .23
5.1.14 Inputs quality.23
5.2 Determination of performance requirements for the drain and sewer system .23
6 Integrated Sewer System Management.26
6.1 Introduction.26
6.2 Investigation.27
6.2.1 Introduction.27
6.2.2 Purpose of investigation.28
6.2.3 Review of performance information .28
6.2.4 Determine the scope of the investigation .30
6.2.5 Review existing information.30
6.2.6 Inventory update.31
6.2.7 Hydraulic investigation.31
6.2.8 Environmental investigation.31
6.2.9 Structural investigation.32
6.2.10 Operational Investigation.32
6.3 Assessment.33
6.3.1 Introduction.33
6.3.2 Assessment of the hydraulic performance.33
6.3.3 Assessment of environmental impact.33
6.3.4 Assess structural condition .34
6.3.5 Assess operational performance.34
6.3.6 Compare with performance requirements .34
6.3.7 Identify unacceptable impacts .34
6.3.8 Identify causes of performance deficiencies.34
6.4 Developing the Plan .34
6.4.1 Introduction.34
6.4.2 Develop integrated solutions.35
6.4.3 Assess Solutions.38
6.4.4 Prepare action plan .39
6.5 Implementation.40
6.5.1 Introduction.40
6.5.2 Carry out work .40
6.5.3 Monitoring performance.41
6.5.4 Review performance requirements and update plan.41
7 Health and Safety Principles .41
8 Design Principles.42
8.1 General.42
8.2 Types of systems .42
8.3 Layout and profile .43
8.4 Hydraulic Design.44
8.4.1 General.44
8.4.2 Foul drains and sewers.44
8.4.3 Surface water drains and sewers .45
8.4.4 Combined drains and sewers .47
8.5 Environmental Considerations.47
8.5.1 General.47
8.5.2 Protection of surface receiving waters .49
8.5.3 Protection of Groundwater.49
8.5.4 Prevention of septicity.49
8.5.5 Combined sewer overflows and surface water treatment.50
8.5.6 Emergency overflows.50
8.6 Structural Design.50
8.6.1 Introduction.50
8.6.2 Structural design of pipelines.51
8.6.3 Structural design of other components.51
8.6.4 Materials selection.51
8.7 Operational Considerations.52
8.7.1 General.52
8.7.2 Separators.52
8.7.3 Self-cleansing conditions.52
8.7.4 Access to drains and sewers .53
9 Detailed Design.53
9.1 Introduction.53
9.2 Layout and profile .53
9.2.1 Introduction.53
9.2.2 Layout.53
9.2.3 Accessibility.54
9.2.4 Depth.54
9.2.5 Need for pumping.55
9.2.6 Pumping Installations.55
9.3 Preliminary Investigations.56
9.3.1 General.56
9.3.2 Topography.56
9.3.3 Geotechnical Survey.56
9.3.4 Groundwater.57
9.3.5 Existing drainage services .57
9.3.6 Other existing utility services .57
9.3.7 Extraneous water.57
9.4 Hydraulic Design.57
9.4.1 Introduction.57
9.4.2 Foul drains and sewers.57
9.4.3 Surface water drains and sewers .58
9.4.4 Combined drains and sewers.58
9.4.5 Capacity of pipelines.59
9.4.6 Sewers with steep gradients .59
9.4.7 Outfall Design Requirements .60
9.5 Environmental Considerations.60
9.5.1 Introduction.60
9.5.2 Outfall Design Requirements .60
9.5.3 Prevention of septicity .60
9.5.4 Drains and sewers near water abstraction areas.61
9.6 Operational Considerations.61
9.6.1 Introduction.61
9.6.2 Separators.61
9.6.3 Design for self-cleansing.61
9.6.4 Access to drains and sewers .62
10 Construction Principles.63
10.1 General.63
10.2 Pipelines.63
10.3 Ancillaries.63
11 Operations and Maintenance.64
11.1 Introduction.64
11.2 Objectives.65
11.3 Data requirements.65
11.4 Investigation and analysis of operational problems.66
12 Performance testing.67
13 Qualifications and Training.67
14 Sources of Additional Information.68
Annex A (informative) Relevant EU Directives.69
A.1 Introduction.69
A.2 Relevant Directives.69
Annex B (informative) Sources of Additional Information.70
B.1 National Standards Bodies.70
B.2 Austria.70
B.2.1 Regulatory Bodies.70
B.2.2 Other organisations.70
B.3 Denmark.71
B.3.1 Regulatory Bodies.71
B.3.2 Other organisations.71
B.4 France.72
B.4.1 Regulatory Bodies.72
B.4.2 Other organisations.72
B.5 Germany.72
B.5.1 Regulatory Bodies.72
B.5.2 Other organisations.73
B.6 Ireland.73
B.7 Italy.73
B.7.1 Regulatory Bodies.73
B.7.2 Other organisations.73
B.8 The Netherlands.74
B.8.1 Regulatory Bodies.74
B.8.2 Other organisations.74
B.9 Norway.75
B.9.1 Regulatory Bodies.75
B.9.2 Other organisations.75
B.10 Portugal.75
B.10.1 Regulatory Bodies.75
B.10.2 Other organisations.76
B.11 Sweden.76
B.11.1 Regulatory Bodies.76
B.11.2 Other organisations.76
B.12 Switzerland.76
B.12.1 Regulatory Bodies.76
B.12.2 Other organisations.77
B.13 United Kingdom.77
B.13.1 Regulatory Bodies.77
B.13.2 Other organisations.79
Annex C (normative) Operations and maintenance .80
C.1 Introduction.80
C.2 Operations planning.80
C.2.1 Inspection routines.80
C.2.2 Operations procedures.80
C.2.3 Contingency Planning.80
C.3 Pipelines.81
C.3.1 General.81
C.3.2 Functional problems.81
C.3.3 Structural problems.82
C.4 Manholes and Inspection Chambers.83
C.5 Combined sewer overflows.83
C.6 Detention tanks.84
C.7 Separators, settling chambers and gullies.84
C.8 Pumping installations.85
C.9 Inverted siphons.85
C.10 Pest control.86
C.11 Making connections to existing drains and sewers .86
C.12 Control of disused drains and sewers .87
C.13 Control of building over or adjacent to sewers.87
Annex D (normative) Health and Safety .88
D.1 Safe systems of work.88
D.2 Training and supervision.88
D.3 Hazardous atmospheres.88
D.3.1 Oxygen deficient and toxic atmospheres .88
D.3.2 Potentially explosive atmospheres .88
D.4 Traffic control.89
D.5 Protective equipment and welfare facilities.89
D.6 Emergency procedures.89
D.7 Temporary works.89
D.8 Excavation work.89
D.9 Hazardous materials.90
D.10 Vaccinations.90
Annex E (normative) Hydraulic Design .91
E.1 General.91
E.1.1 Introduction.91
E.1.2 Selection of Flow Simulation Method.91
E.2 Hydraulic calculations.92
E.2.1 Velocity equations.92
E.2.2 The Saint Venant equations .94
E.3 Methods of calculating runoff from small development schemes.96
E.4 Calculation of foul wastewater flows for drain systems .97
E.5 Calculation of foul wastewater flows for sewer system.97
E.6 Combined sewer overflows.98
Annex F (normative) Pumping Installations.99
F.1 General.99
F.2 Planning of pumping installations.99
F.2.1 Preliminary Considerations.99
F.2.2 Planning.100
F.3 Design of pumping stations .101
F.3.1 Layout.101
F.3.2 Wet well design.102
F.3.3 External layout and access.103
F.3.4 Environmental impact.103
F.3.5 Structural design.103
F.3.6 Maintenance considerations.103
F.4 Design of rising mains .104
F.4.1 Principal considerations.104
F.4.2 Choice of route.104
F.4.3 Choice of diameter.104
F.4.4 Pressures and external loads.104
F.4.5 Choice of materials.105
F.4.6 Thrust.105
F.4.7 Discharge points.105
F.4.8 Control of Septicity.105
F.4.9 Valve chambers.105
F.5 Components and appliances.106
F.5.1 Pumps.106
F.5.2 Prime Movers and Drives.106
F.5.3 Valves.107
F.5.4 Controls and electrical equipment.107
F.5.5 Instrumentation.108
F.5.6 Alarms.108
F.6 Health and Safety.108
Bibliography .110

Foreword
This document (EN 752:2008) 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 2008, and conflicting national standards shall be withdrawn at the
latest by July 2008.
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.
This document supersedes EN 752-1:1995, EN 752-2:1996, EN 752-3:1996, EN 752-4:1997, EN 752-5:1997,
EN 752-6:1998, EN 752-7:1998.
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, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Introduction
Drain and sewer systems are part of the overall wastewater system that provides a service to the community.
This can be briefly described as:
 removal of wastewater from premises for public health and hygienic reasons;
 prevention of flooding in urbanised areas;
 protection of the environment.
The overall wastewater system has four successive functions:
 Collection;
 Transport;
 Treatment;
 Discharge.
Drain and sewer systems provide for the collection and transport of wastewater.
Historically, drain and sewer systems were installed because there was a need to remove the polluted water
to prevent diseases.
Traditionally, drain and sewer systems were constructed to collect and transport all types of wastewater
together irrespective of the initial source. This led to difficulties in handling the peak flows in times of heavy
rainfall and to the introduction of combined sewer overflows, which discharged polluted water to surface
receiving waters.
It was later recognised that separate systems, where foul wastewater was kept separate from runoff derived
from surface water, would be an improvement over such combined systems.
Although many drain and sewer systems started out as combined systems there are strong arguments for
considering the separation of foul wastewater and surface water. The pollutant effects are not the same and
the separation of effluents allows for the different treatment for each element of wastewater, providing more
environmentally friendly solutions.
This concept is included in the approach of integrated sewer management.
EN 752 provides a framework for the design, construction, rehabilitation, maintenance and operation of drain
and sewer systems outside buildings. This is illustrated in the upper part of the diagram below. EN 752 is
supported by more detailed standards for the investigation, design, construction, organisation and control of
drain and sewer systems such as those listed in the lower part of the diagram. To support these detailed
standards information will come from specifications produced by individual organisations for their own use.
Product standards should also take into account the functional requirements in EN 752 through EN 476,
EN 773, EN 1293, EN 13380 and EN 14457.

Figure 1 — Pyramid Diagram
1 Scope
This European Standard sets out the objectives for drain and sewer systems outside buildings. It specifies the
functional requirements for achieving these objectives and the principles for strategic and policy activities
relating to planning, design, installation, operation, maintenance and rehabilitation.
It is applicable to drain and sewer systems, which operate essentially under gravity, 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.
Drains and sewers below buildings are included provided that they do not form part of the drainage system for
the building.
2 Normative references
...