SIST EN 16941-1:2024

On-site non-potable water systems - Part 1: Systems for the use of rainwater

This European Standard specifies the requirements and gives recommendations for the design, sizing, installation, identification, commissioning and maintenance of rainwater harvesting systems for the use of rainwater on-site as non-potable water. This European Standard also specifies the minimum requirements for these systems.
Excluded from the scope of this European Standard are:
- the use as drinking water and for food preparation;
- the use for personal hygiene purposes;
- decentralized attenuation;
- infiltration.
NOTE   Conformity with the standard does not exempt from compliance with the obligations arising from local or national regulations.

Vor-Ort-Anlagen für Nicht-Trinkwasser - Teil 1: Anlagen für die Verwendung von Regenwasser

Dieses Dokument legt Anforderungen fest und enthält Empfehlungen für Planung, Bemessung, Einbau, Kennzeichnung, Inbetriebnahme und Wartung von Regenwassernutzungsanlagen zur Verwendung von Regenwasser als Nicht Trinkwasser vor Ort. Dieses Dokument legt auch die Mindestanforderungen an solche Systeme fest.
Vom Anwendungsbereich dieses Dokuments ausgenommen sind
   die Verwendung als Trinkwasser und zur Herstellung von Speisen,
   die Verwendung für die Körperhygiene,
   Rückhaltung und
   Versickerung.
ANMERKUNG   Konformität mit diesem Dokument entbindet nicht von der Einhaltung der Auflagen, die sich aus örtlichen oder nationalen Vorschriften ergeben können.

Réseaux d’eau non potable sur site - Partie 1 : Systèmes pour l’utilisation de l’eau de pluie

Le présent document spécifie les exigences et fournit des recommandations concernant la conception, le dimensionnement, l’installation, l’identification, la mise en service et l’entretien des systèmes de récupération de l’eau de pluie pour son utilisation sur site en tant qu’eau non potable. Le présent document spécifie également les exigences minimales relatives à ces systèmes.
Sont exclus du domaine d’application du présent document :
-   l’utilisation comme eau potable et pour la préparation des aliments ;
-   l’utilisation pour l’hygiène personnelle ;
-   la rétention et la régulation à débit contrôlé ; et
-   l’infiltration.
NOTE   La conformité au présent document ne dispense pas de se conformer aux obligations découlant des réglementations nationales ou locales.

Sistemi za nepitno vodo, nameščeni na kraju samem - 1. del: Sistemi za uporabo deževnice

Ta evropski standard določa zahteve in podaja priporočila v zvezi z načrtovanjem, velikostmi, nameščanjem, identifikacijo, začetkom uporabe in vzdrževanjem sistemov za zbiranje deževnice za njeno uporabo na kraju samem kot nepitno vodo. Ta evropski standard prav tako določa minimalne zahteve za te sisteme.
Področje uporabe tega evropskega standarda ne zajema:
– uporabe kot pitno vodo in uporabe za pripravo hrane;
– uporabe za namen osebne higiene;
– decentraliziranega zmanjševanja odtoka vode;
– infiltracije.
OPOMBA:   Skladnost s standardom uporabnika ne odvezuje izpolnjevanja zahtev, ki izhajajo iz lokalnih ali nacionalnih predpisov.

General Information

• Status: Published
• Public Enquiry End Date: 30-Oct-2022
• Publication Date: 15-Apr-2024
• ICS: 93.025 - External water conveyance systems
• Technical Committee: IOVO - Water supply and waste water engineering
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 09-Apr-2024
• Due Date: 14-Jun-2024
• Completion Date: 16-Apr-2024
• Ref Project: EN 16941-1:2024 - On-site non-potable water systems - Part 1: Systems for the use of rainwater

Relations

• Revised: SIST EN 16941-1:2018 - On-site non-potable water systems - Part 1: Systems for the use of rainwater
• Effective Date: 11-May-2022

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-2024
Sistemi za nepitno vodo, nameščeni na kraju samem - 1. del: Sistemi za uporabo
deževnice
On-site non-potable water systems - Part 1: Systems for the use of rainwater
Vor-Ort-Anlagen für Nicht-Trinkwasser - Teil 1: Anlagen für die Verwendung von
Regenwasser
Réseaux d’eau non potable sur site - Partie 1 : Systèmes pour l’utilisation de l’eau de
pluie
Ta slovenski standard je istoveten z: EN 16941-1:2024
ICS:
93.025 Zunanji sistemi za prevajanje External water conveyance
vode systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 16941-1
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2024
EUROPÄISCHE NORM
ICS 93.025 Supersedes EN 16941-1:2018
English Version
On-site non-potable water systems - Part 1: Systems for
the use of rainwater
Réseaux d'eau non potable sur site - Partie 1 : Systèmes Vor-Ort-Anlagen für Nicht-Trinkwasser - Teil 1:
pour l'utilisation de l'eau de pluie Anlagen für die Verwendung von Regenwasser
This European Standard was approved by CEN on 15 January 2024.

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, Türkiye 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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 16941-1:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Functional elements of rainwater harvesting systems . 8
5 Design . 8
5.1 Collection . 8
5.1.1 General. 8
5.1.2 Collection surfaces . 9
5.1.3 Collection piping system . 9
5.2 Treatment . 10
5.2.1 General. 10
5.2.2 Preliminary treatment . 10
5.2.3 Treatment in storage device . 10
5.2.4 Additional treatment . 11
5.3 Storage . 11
5.3.1 General. 11
5.3.2 Materials . 11
5.3.3 Dimensions. 11
5.3.4 Capacity . 11
5.3.5 Structural behaviour . 11
5.3.6 Watertightness . 12
5.3.7 Connections and internal pipe system . 12
5.3.8 Access . 12
5.3.9 Overflow . 12
5.4 Back-up water supply . 13
5.4.1 General. 13
5.4.2 Backflow protection device . 13
5.5 Pumping . 16
5.5.1 General. 16
5.5.2 Submerged pump . 16
5.5.3 Non-submerged pump. 17
5.5.4 Expansion vessel . 17
5.5.5 Pump control unit . 17
5.6 System control with monitoring . 18
5.7 Metering . 18
5.8 Distribution . 18
5.9 Risk assessment . 19
6 Sizing . 19
6.1 Storage device . 19
6.1.1 General. 19
6.1.2 Determination of the available volume of rainwater . 20
6.1.3 Determination of the non-potable water demand . 21
6.1.4 Calculation methods . 22
6.2 Back-up water supply . 22
7 Installation . 23
8 Differentiation and identification . 24
9 Commissioning . 24
10 Quality of non-potable water . 25
11 Maintenance . 25
Annex A (informative) Examples of calculation methods for storage capacity. 26
A.1 General . 26
A.2 Examples of calculation methods . 26
A.2.1 Basic approach with annual time step . 26
A.2.2 Detailed approach . 27
Annex B (informative) Examples of rainwater harvesting systems with different back-up
supply arrangements . 31
Annex C (informative) Example for a commissioning sheet . 34
Annex D (informative) Example of dye testing for distribution pipework cross-connections . 36
Annex E (informative) Inspection and maintenance . 37
E.1 Inspection and maintenance instruction sheet . 37
E.2 Logbook . 38
Bibliography . 39

European foreword
This document (EN 16941-1:2024) has been prepared by Technical Committee CEN/TC 165 “Waste
water 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 2024, and conflicting national standards
shall be withdrawn at the latest by September 2024.
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 16941-1:2018.
EN 16941-1:2018:
— necessary technical and editorial updates and alignments with EN 16941-2:2021.
EN 16941, On-site non-potable water systems consists of the following parts:
— Part 1: Systems for the use of rainwater
— Part 2: Systems for the use of treated greywater
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, Sp
...