National foreword

This British Standard is the UK implementation of EN 16933‑2:2017.

The UK participation in its preparation was entrusted to Technical Committee B/505/22.

The UK committee draws users' attention to the National Annex NA, which provides further guidance to assist users in the application of BS EN 16933‑2:2017.

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

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 31 October 2017.

This European Standard was approved by CEN on 30 July 2017.

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, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.

European foreword

This document (EN 16933‑2:2017) 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of an identical text or by endorsement, at the latest by March 2018 and conflicting national standards shall be withdrawn at the latest by March 2018.

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 European Standard EN 16933, Drain and sewer systems outside buildings - Design, contains the following parts:

Part 1: Physical design1)
Part 2: Hydraulic design.

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, 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 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.

Collection and transport of wastewater is provided by drain and sewer systems.

EN 752:2017 provides a framework for the design, construction, maintenance, operation and rehabilitation of drain and sewer systems outside buildings. This is illustrated in the upper part of the diagram in Figure 1. EN 752:2017 is supported by more detailed standards for the investigation, design, construction, organization and control of drain and sewer systems.

Investigation and assessment standards include:

EN 13508, Investigation and assessment of drain and sewer systems outside buildings.

Design and construction standards include:

EN 169322), Drain and sewer systems outside buildings — Pumping systems;
EN 169333), Drain and sewer systems outside buildings — Design;
EN 12954), Structural design of buried pipelines under various conditions of loading;
EN 1610, Construction and testing of drains and sewers;
EN 12889, Trenchless construction and testing of drains and sewers;
EN 15885, Classification and characteristics of techniques for renovation, repair and replacement of drains and sewers.

Management and control standards include:

EN 14654, Management and control of operational activities in drain and sewer systems outside buildings.

1 Scope

This European Standard specifies requirements for the design of drain and sewer systems outside buildings.

It is applicable to drain and sewer systems from the point where the wastewater leaves a building, roof drainage system, or paved area, to a point where it is discharged into a wastewater treatment plant or receiving water body.

This document specifies requirements for the hydraulic design of drain and sewer systems and the assessment of the capacity of existing drain and sewer systems.

2 Normative references

3 Terms and definitions

4 Symbols and units

5 General

6 Design criteria

7 Hydraulic capacity of pipelines

7.1 Introduction

7.2 Pipeline headlosses

7.3 Local headlosses

7.4 Total headlosses

8 Incoming flows

8.1 Foul wastewater flows

8.2 Rainfall and runoff from precipitation

8.3 Extraneous flows

9 Hydraulic calculation of drain and sewer systems

9.1 General

9.2 Flow in sewer systems

9.3 Flow simulation methods

9.4 Surface flood routing

9.5 Validation of models

10 Hydraulic design

10.1 Capacity of drains and sewers

10.2 Design for self-cleansing

10.3 Sewers with steep gradients

10.4 Surface water inlets

10.5 Separators, screens and pretreatment devices

10.6 Infiltration drainage systems

10.7 Evaporation systems

10.8 Manholes and inspection chambers

10.9 Combined sewer overflows

10.10 Tanks and ponds

10.11 Outfalls

11 Sources of additional information

Bibliography

BS EN 16933-2:2017

Drain and sewer systems outside buildings. Design - Hydraulic design

Current

Published:

30 Jun 2018