National foreword

This British Standard is the UK implementation of EN 752:2008. It supersedes BS EN 752, Parts 1 to 7, which have been withdrawn.

The UK participation in its preparation was entrusted to Technical Committee B/505, Wastewater engineering.

A list of organizations represented on this committee can be obtained on request to its secretary.

The British Standard contains both the text of the European Standard together with a National Annex, which gives further UK-specific guidance on the application of the European text. The European Standard should therefore be read in conjunction with the National Annex and, to assist in this, cross references to the clauses in the European text are included in the headings in the National Annex.

This revision of EN 752 includes some important and timely changes. It takes a more integrated view of sewer system management in the context of the wider urban drainage system and the wider water environment. This both supports the current initiative on integrated urban drainage management in the UK and is essential for the proper implementation of the Water Framework Directive. In response to climate change, the European text introduces the concept of exceedence flood risk assessment and further UK guidance on this is given in the National Annex.

This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.

Compliance with a British Standard cannot confer immunity from legal obligations.

This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 April 2008

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.

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.

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

3 Terms and definitions

4 Objectives

4.1 General

4.2 Public Health and Safety

4.3 Occupational Health and Safety

4.4 Environmental Protection

4.5 Sustainable Development

5 Requirements

5.1 Functional Requirements

5.2 Determination of performance requirements for the drain and sewer system

6 Integrated Sewer System Management

6.1 Introduction

6.2 Investigation

6.3 Assessment

6.4 Developing the Plan

6.5 Implementation

7 Health and Safety Principles

8 Design Principles

8.1 General

8.2 Types of systems

8.3 Layout and profile

8.4 Hydraulic Design

8.5 Environmental Considerations

8.6 Structural Design

8.7 Operational Considerations

9 Detailed Design

9.1 Introduction

9.2 Layout and profile

9.3 Preliminary Investigations

9.4 Hydraulic Design

9.5 Environmental Considerations

9.6 Operational Considerations

10 Construction Principles

10.1 General

10.2 Pipelines

10.3 Ancillaries

11 Operations and Maintenance

11.1 Introduction

11.2 Objectives

11.3 Data requirements

11.4 Investigation and analysis of operational problems

12 Performance testing

13 Qualifications and Training

14 Sources of Additional Information

Bibliography

Bibliography

BS EN 752:2008

Drain and sewer systems outside buildings

Published:

30 Apr 2008

Withdrawn:

9 Mar 2018