SIST EN 16933-1:2022
(Main)Drain and sewer systems outside buildings - Design - Part 1: Layout principles
Drain and sewer systems outside buildings - Design - Part 1: Layout principles
This document specifies requirements for the design of drain and sewer systems outside buildings.
It is applicable to drain and sewer systems, which operate essentially under gravity, 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 part specifies requirements for the layout of drain and sewer systems.
Entwässerungssysteme außerhalb von Gebäuden - Planung - Teil 1: Planungsgrundsätze
Dieses Dokument legt Anforderungen an die Planung von Entwässerungssystemen außerhalb von Gebäuden fest.
Es gilt für Entwässerungssysteme, die überwiegend mit Freispiegelleitungen betrieben werden, von dem Punkt an, an dem das Abwasser das Gebäude bzw. die Dachentwässerung oder in einen Straßenablauf fließt, bis zu dem Punkt, an dem das Abwasser in eine Kläranlage oder ein aufnehmendes Gewässer eingeleitet wird.
Dieser Teil legt Anforderungen an die Gestaltung von Entwässerungssystemen außerhalb von Gebäuden fest.
Réseaux d’évacuation et d’assainissement à l’extérieur des bâtiments - Conception - Partie 1 : Principes d’implantation
Le présent document spécifie les prescriptions relatives à la conception des réseaux d’évacuation et d’assainissement à l’extérieur des bâtiments.
Il s’applique aux réseaux d’évacuation et d’assainissement, principalement des 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.
La présente partie spécifie les prescriptions relatives au tracé en plan des réseaux d’évacuation et d’assainissement.
Sistemi za odvod odpadne vode in kanalizacijo zunaj stavb - Načrtovanje - 1. del: Načela načrtovanja
Ta dokument določa zahteve za sisteme za odvod odpadne vode in kanalizacijo zunaj stavb.
Uporablja se za sisteme za odvod odpadne vode in kanalizacijo zunaj stavb, ki delujejo zlasti s pomočjo gravitacije, od točke, kjer odpadne vode zapustijo stavbo, strešni drenažni sistem ali tlakovano območje, do točke, kjer se izlivajo v čistilne naprave za gospodinjske odplake ali sprejemajoče vodno telo.
Ta del določa zahteve za načrtovanje sistemov za odvod odpadne vode in kanalizacijo.
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 16933-1:2022
01-maj-2022
Sistemi za odvod odpadne vode in kanalizacijo zunaj stavb - Načrtovanje - 1. del:
Načela načrtovanja
Drain and sewer systems outside buildings - Design - Part 1: Layout principles
Entwässerungssysteme außerhalb von Gebäuden - Planung - Teil 1:
Planungsgrundsätze
Réseaux d’évacuation et d’assainissement à l’extérieur des bâtiments - Conception -
Partie 1 : Principes d’implantation
Ta slovenski standard je istoveten z: EN 16933-1:2022
ICS:
91.140.80 Drenažni sistemi Drainage systems
93.030 Zunanji sistemi za odpadno External sewage systems
vodo
SIST EN 16933-1:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 16933-1:2022
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SIST EN 16933-1:2022
EN 16933-1
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2022
EUROPÄISCHE NORM
ICS 93.030
English Version
Drain and sewer systems outside buildings - Design - Part
1: Layout principles
Réseaux d'évacuation et d'assainissement à l'extérieur Entwässerungssysteme außerhalb von Gebäuden -
des bâtiments - Conception - Partie 1 : Principes Planung - Teil 1: Planungsgrundsätze
d'implantation
This European Standard was approved by CEN on 17 January 2022.
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
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 16933-1:2022 E
worldwide for CEN national Members.
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SIST EN 16933-1:2022
EN 16933-1:2022 (E)
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 General. 8
4.1 Introduction . 8
4.2 The design process . 8
5 Preliminary investigations . 10
5.1 General. 10
5.2 Topography . 10
5.3 Geotechnical survey . 10
5.4 Groundwater . 11
5.5 Existing drainage services . 11
5.6 Other existing utility services . 11
5.7 Nature and quality of inputs . 11
6 Layout . 12
6.1 General. 12
6.2 Access locations . 14
6.3 Provision of pumping . 16
6.4 Drains and sewers near water abstraction areas . 17
7 Sources of additional information . 17
Bibliography . 18
2
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SIST EN 16933-1:2022
EN 16933-1:2022 (E)
European foreword
This document (EN 16933-1:2022) 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 September 2022, and conflicting national standards
shall be withdrawn at the latest by September 2022.
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.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
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 16933-1:2022
EN 16933-1:2022 (E)
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.
EN 752:2017 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 in Figure 1. EN 752:2017 is supported by more detailed standards for the investigation, design,
construction, management and control of drain and sewer systems.
Investigation and assessment standards include:
— EN 13508 (all parts), Investigation and assessment of drain and sewer systems outside buildings
Design and construction standards include:
— EN 16932 (all parts), Drain and sewer systems outside buildings - Pumping systems
— EN 16933, Drain, sewer systems outside buildings - Design
— EN 1295, 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 (all parts), Drain and sewer systems outside buildings - Management and control of
activities
4
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SIST EN 16933-1:2022
EN 16933-1:2022 (E)
1
Figure 1 — Relationship to EN 752:2017 and other drain and sewer standards
1
Source: EN 752:2017.
5
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SIST EN 16933-1:2022
EN 16933-1:2022 (E)
1 Scope
This document 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 layout of drain and sewer systems.
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 14654 (all parts), Drain and sewer systems outside buildings - Management and control of activities
EN 16323:2014, Glossary of wastewater engineering terms
EN 16932 (all parts), Drain and sewer systems outside buildings - Pumping systems
EN 16933-2:2017, Drain and sewer systems outside buildings - Design - Part 2: Hydraulic design
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 16323 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 https://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:
combined sewer overflow, jetting, runoff,
combined system, maintenance, separate system,
detention tank, manhole, sewer,
drain, outfall, sewer system,
dry weather flow, pumping station, surcharge,
foul wastewater, receiving water body, surface receiving water body,
gradient, rehabilitation, surface water,
gravity system, relevant authority, wastewater,
infiltration, repair, wastewater treatment plant.
inspection chamber, rising main,
inverted syphon, rodding,
6
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SIST EN 16933-1:2022
EN 16933-1:2022 (E)
3.1
pumping installation
pumping station together with any associated rising main(s)
[SOURCE: EN 752:2017, 3.8]
3.2
layout
configuration of the principal components of a drain and sewer system in both the horizontal and
vertical planes
3.3
detention pond
permanently wet depression designed to temporarily store surface water runoff above the permanent
pool and permit settlement of suspended solids and biological removal of pollutants
3.4
principal component
functional unit that forms part of a wastewater system
EXAMPLES pipeline section, pumping station, combined sewer overflow, gully
3.5
rodding point
small diameter connection to a drain or sewer that facilitates cleaning or inspection
3.6
sewer flooding
condition where wastewater and/or surface water escapes from or cannot enter a drain or sewer
system and either lies on the surface or enters buildings
[SOURCE: EN 752:2017, 3.13]
3.8
drainage
group of technologies techniques and actions to achieve satisfactory hygiene and public health relating
to wastewater, including both foul wastewater and surface water
[SOURCE: EN 752:2017, 3.18]
7
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SIST EN 16933-1:2022
EN 16933-1:2022 (E)
4 General
4.1 Introduction
This document covers the design of the layout of drain and sewer systems that are intended to be
constructed to implement a sewer system management plan in accordance with EN 752:2017, 6.4.4.
Implementation of these plans shall be in accordance with EN 752:2017, 6.5, and EN 14654 (all parts).
EN 752:2017 specifies objectives, functional requirements and the principles for design of drain and
sewer systems outside buildings.
The design of the layout is affected by the functional requirements, in particular the following:
— Maintainability (see EN 752:2017, 5.1.3);
— Protection of groundwater (see EN 752:2017, 5.1.5);
— Prevention of odours and toxic, explosive and corrosive gases (see EN 752:2017, 5.1.6);
— Prevention of noise and vibration (see EN 752:2017, 5.1.7);
— Structural integrity and design working life (see EN 752:2017, 5.1.8);
— Maintaining the flow (see EN 752:2017, 5.1.12);
— Not endangering adjacent structures and utility services (see EN 752:2017, 5.1.13).
Except where they are specified by national or local regulations or the relevant authority, design
criteria shall be determined in accordance with EN 752:2017, 5.3.
4.2 The design process
The design of the layout shall be carried out in accordance with the design principles in EN 752:2017,
8.3.
It is essential because it allows the designer to collect and evaluate all the data needed to make the best
technical choices in terms of design, construction, rehabilitation, maintenance and operation.
The dimensions and gradients of the pipes are determined by the hydraulic design (see
EN 16933-2:2017) or operational requirements and topographical constraints.
Establishing the layout is the first stage of the design of new drain and sewer systems. The process is
summarized in Figure 2. In large projects this can be carried out in a number of stages with an outline of
the layout first produced for the whole catchment. This can form part of the sewer system management
plan (see EN 752:2017, Clause 6). This can then be followed by the more detailed layout of the main
sewers in each of a number of sub-catchments. Finally, the layout of the smaller drains and sewers
around the buildings can be established.
8
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SIST EN 16933-1:2022
EN 16933-1:2022 (E)
Figure 2 — Summary of the design process
9
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SIST EN 16933-1:2022
EN 16933-1:2022 (E)
5 Preliminary investigations
5.1 General
Preliminary investigations should be undertaken to enable the evaluation of the layout and the
construction options. These investigations should be from records or surveys and should include:
a) topographical investigations;
b) geotechnical investigations;
c) groundwater investigations;
d) investigations of existing drainage services;
e) investigations of other utility services;
f) investigations of the nature and quality of inputs.
As the project develops further, more detailed investigations should be carried out where necessary.
5.2 Topography
Surface reconnaissance and examination of contour maps and aerial photograph
...
SLOVENSKI STANDARD
oSIST prEN 16933-1:2020
01-september-2020
Sistemi za odvod odpadne vode in kanalizacijo zunaj stavb - Načrtovanje - 1. del:
Načela načrtovanja
Drain and sewer systems outside buildings - Design - Part 1: Layout principles
Entwässerungssysteme außerhalb von Gebäuden - Planung - Teil 1:
Planungsgrundsätze
Réseaux d’évacuation et d’assainissement à l’extérieur des bâtiments - Conception -
Partie 1 : Principes d’implantation
Ta slovenski standard je istoveten z: prEN 16933-1
ICS:
91.140.80 Drenažni sistemi Drainage systems
93.030 Zunanji sistemi za odpadno External sewage systems
vodo
oSIST prEN 16933-1:2020 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 16933-1:2020
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oSIST prEN 16933-1:2020
DRAFT
EUROPEAN STANDARD
prEN 16933-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2020
ICS 93.030
English Version
Drain and sewer systems outside buildings - Design - Part
1: Layout principles
Réseaux d'évacuation et d'assainissement à l'extérieur Entwässerungssysteme außerhalb von Gebäuden -
des bâtiments - Conception - Partie 1 : Principes Planung - Teil 1: Planungsgrundsätze
d'implantation
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, 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.
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
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 16933-1:2020 E
worldwide for CEN national Members.
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oSIST prEN 16933-1:2020
prEN 16933-1:2020 (E)
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 General . 7
4.1 Introduction . 7
4.2 The design process . 8
5 Preliminary investigations . 10
5.1 General . 10
5.2 Topography . 10
5.3 Geotechnical survey . 10
5.4 Groundwater . 11
5.5 Existing drainage services . 11
5.6 Other existing utility services . 11
5.7 Nature and quality of inputs . 11
6 Layout . 11
6.1 General . 11
6.2 Access locations . 14
6.3 Provision of pumping . 15
6.4 Drains and sewers near water abstraction areas . 16
7 Sources of additional information . 16
Bibliography . 17
2
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oSIST prEN 16933-1:2020
prEN 16933-1:2020 (E)
European foreword
This document (prEN 16933-1:2020) 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.
3
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oSIST prEN 16933-1:2020
prEN 16933-1:2020 (E)
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.
EN 752:2017 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 in Figure 1. EN 752:2017 is supported by more detailed standards for the investigation, design,
construction, management and control of drain and sewer systems.
Investigation and assessment standards include:
— EN 13508 (all parts), Investigation and assessment of drain and sewer systems outside buildings.
Design and construction standards include:
— EN 16932 (all parts), Drain and sewer systems outside buildings — Pumping systems,
— EN 16933, Drain, sewer systems outside buildings — Design
— EN 1295, 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 and repair of drains and
sewers.
Management and control standards include:
— EN 14654 (all parts), Management and control of operational activities in drain and sewer systems
outside buildings.
4
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oSIST prEN 16933-1:2020
prEN 16933-1:2020 (E)
1
Figure 1 — Relationship to EN 752:2017 and other drain and sewer standards
1
Source: EN 752:2017
5
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oSIST prEN 16933-1:2020
prEN 16933-1:2020 (E)
1 Scope
This document specifies requirements for the design of drain and sewer systems outside buildings.
It is applicable to drain and sewer systems, which operate essentially under gravity, 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 part specifies requirements for the layout of drain and sewer systems.
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 16323, Glossary of wastewater engineering terms
EN 16932 (all parts), Drain and sewer systems outside buildings — Pumping systems
EN 16933-2:2017, Drain and sewer systems outside buildings — Design — Part 2: Hydraulic design
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 16323 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 https://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 document are defined in EN 16323:2014:
combined sewer overflow, jetting, runoff,
combined system, maintenance, separate system,
detention tank, manhole, sewer,
drain, outfall, sewer system,
dry weather flow, pumping station, surcharge,
foul wastewater, receiving water body, surface receiving water body,
gradient, rehabilitation, surface water,
gravity system, relevant authority, wastewater,
infiltration, repair, wastewater treatment plant.
inspection chamber, rising main,
inverted syphon, rodding,
3.1
pumping installation
pumping station together with any associated rising main(s)
3.2
layout
configuration of the principal components of a drain and sewer system in both the horizontal and
vertical planes
6
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oSIST prEN 16933-1:2020
prEN 16933-1:2020 (E)
3.3
detention pond
permanently wet depression designed to temporarily store surface water runoff above the permanent
pool and permit settlement of suspended solids and biological removal of pollutants
3.4
principal component
functional unit that forms part of a wastewater system
EXAMPLES pipeline section, pumping station, combined sewer overflow, gully
3.5
rodding point
small diameter non-man access connection to a drain or sewer that facilitates cleaning or inspection
3.6
sewer flooding
condition where wastewater and/or surface water escapes from or cannot enter a drain or sewer
system and either lies on the surface or enters buildings (see also surface sewer flooding)
3.7
surface sewer flooding
condition where wastewater on the surface or enters buildings from the surface (see also sewer
flooding)
3.8
drainage
group of technologies techniques and actions to achieve satisfactory hygiene and public health relating
to wastewater, including both foul wastewater and surface water
Note 1 to entry: WG30 is proposing an amendment to EN 16323 to change this term from “urban drainage” to
“drainage”.
3.9
whole life cost
aggregate cost of a scheme over its design life, being the sum of the construction, operating and
maintenance costs all calculated at the same time base
4 General
4.1 Introduction
This document covers the design of the layout of new drain and sewer systems that are to be
constructed to implement a sewer system management plan in accordance with EN 752:2017, 6.4.4.
Implementation of these plans shall be in accordance with EN 752:2017, 6.5, and EN 14654.
EN 752:2017 specifies objectives, functional requirements and the principles for design of drain and
sewer systems outside buildings.
The design of the layout is affected by the functional requirements, in particular the following:
— Maintainability (see EN 752:2017, 5.1.3);
— Protection of groundwater (see EN 752:2017, 5.1.5);
— Prevention of odours and toxic, explosive and corrosive gases (see EN 752:2017, 5.1.6);
7
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oSIST prEN 16933-1:2020
prEN 16933-1:2020 (E)
— Prevention of noise and vibration (see EN 752:2015, 5.1.7);
— Structural integrity and design working life (see EN 752:2017, 5.1.8);
— Maintaining the flow (see EN 752:2017, 5.1.12);
— Not endangering adjacent structures and utility services (see EN 752:2017, 5.1.13).
Except where they are specified by national or local regulations or the relevant authority, design
criteria shall be determined in accordance with EN 752:2017, 5.3.
4.2 The design process
The design of the layout shall be carried out in accordance with the design principles in EN 752:2017,
8.3.
It is essential because it allows the designer to collect and evaluate all the data needed to make the best
technical choices in terms of design, construction, rehabilitation, maintenance and operation.
The dimensions and gradients of the pipes are determined by the hydraulic design (see
EN 16933-2:2017) or operational requirements and topographical constraints.
Establishing the layout is the first stage of the design of new drain and sewer systems. The process is
summarized in Figure 2. In large projects this can be carried out in a number of stages with an outline of
the layout first produced for the whole catchment. This can form part of the sewer system management
plan (see EN 752:2017, Clause 6). This can then be followed by the more detailed layout of the main
sewers in each of a number of sub-catchments. Finally, the layout of the smaller drains and sewers
around the buildings can be established.
8
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oSIST prEN 16933-1:2020
prEN 16933-1:2020 (E)
Figure 2 — Summary of the design process
9
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oSIST prEN 16933-1:2020
prEN 16933-1:2020 (E)
5 Preliminary investigations
5.1 General
Preliminary investigations should be undertaken to enable the evaluation of the layout, and
construction options. These investigations should be from records or surveys and should include:
a) topographical investigations;
b) geotechnical investigations;
c) groundwater investigations;
d) investigations of existing drainage services;
e) investigations of other utility services;
f) investigations of the nature and quality of inputs.
As the project develops further, more detailed investigations should be carried out where necessary.
5.2 Topography
Surface reconnaissance and examination of contour maps and aerial photographs will enable
preliminary lines for drains, sewers and rising mains to be established so that the general feasibility of
the proposals ca
...
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