National foreword

This British Standard was published by BSI. It is the UK implementation of EN 12056‑3:2000. It supersedes BS 6367:1983 which is withdrawn.

The UK participation in its preparation was entrusted by Technical Committee B/505, Wastewater engineering, to Subcommittee B/505/21, Roof drainage and sanitary pipework. Subcommittee B/505/21 was disbanded on 2 November 2000 and so Technical Committee B/505 assumes responsibility for this work.

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

In March 2007, Technical Committee B/505 introduced an amendment to BS EN 12056‑3:2000 to delete National Annex NF. This annex is replaced by the test method given in BS 8490:2007, Annex B.

The remaining national annexes are an informative element of this standard and contain information provided to support easier implementation of EN 12056‑3:2000 in the United Kingdom, within the framework envisaged by the scope of that standard. The remaining national annexes constitute a revision of those parts of BS 6367:1983 that were not otherwise superseded by BS EN 12056‑3:2000. However, users are reminded that only the normative elements of the adopted European Standard set out the provisions to which it is necessary to conform in order to form part of a trade description when citing this British Standard by number or when compliance with it is claimed.

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

Additional information

It is recognized that Figure 2, Figure 3, Figure 4 and Figure 11, along with the logic diagrams contained in Annex D, are of poor quality. This has been reported to CEN in a proposal to correct them in the English language version of EN 12056‑3:2000.

Until the standard is corrected, which BSI is not authorized to do, it is strongly recommended that these figures be used with care.

Textual errors

The textual errors set out below were discovered when the English language version of EN 12056‑3:2000 was adopted as the national standard. They have been reported to CEN in a proposal to amend the text of the European Standard.

Note 1 to Figure 8 should refer to Table 8, rather than Table 7.
Note 3 to Figure 8 should refer to Table 8, rather than Table 7.

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

This British Standard, having been prepared under the direction of the Sector Committee for Building and Civil Engineering, was published under the authority of the Standards Committee and comes into effect on 15 September 2000

This European Standard was approved by CEN on 27 October 1999.

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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.

Foreword

This European Standard 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 December 2000, and conflicting national standards shall be withdrawn at the latest by June 2001.

This part is the third in a series relating to the functional requirements of gravity drainage systems inside buildings. There will be five parts, as follows: Gravity drainage systems inside buildings

Part 1: General and performance requirements

Part 2: Sanitary pipework - Layout and calculation

Part 3: Roof drainage - Layout and calculation

Part 4: Waste water lifting plants - Layout and calculation

Part 5: Installation and testing, instructions for operation, maintenance and use

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.

1 Scope

This European Standard applies to wastewater drainage systems, which operate under gravity. It is applicable for drainage systems inside dwellings and commercial, institutional and industrial buildings.

This third part of this European Standard describes a method of calculating the hydraulic adequacy of non-siphonic roof drainage systems and gives performance requirements for siphonic roof drainage systems. It also sets standards for the layout and installation of roof drainage insofar as they affect flow capacity.

This part of this European Standard applies to all roof drainage systems where the outlets are large enough not to limit the flow capacity of the gutter (i.e. free discharge conditions). It applies to all materials used for roof drainage systems.

Detailed information additional to that contained in this Standard may be obtained by referring to the technical documents listed in Annex B.

2 Normative references

3 Definitions and symbols

3.1 Definitions

3.2 Symbols

4 Runoff calculations

4.1 Quantity of rainwater runoff

4.2 Rainfall intensity, r

4.3 Effective roof area, A

5 Hydraulic design

5.1 Eaves gutters

5.2 Valley and parapet gutters

5.3 Gutter outlets

5.4 Flat roof outlets

6 Rainwater pipes

6.1 Part filled (non-siphonic systems)

6.2 Siphonic systems

6.3 Drains

6.4 Connection to sanitary pipework

7 Layout

7.1 General

7.2 Gutters

7.3 Outlets

7.4 Emergency outlets

7.5 Access

7.6 Pipework

7.7 Trace heating

7.8 Change of building use

BS EN 12056-3:2000

Gravity drainage systems inside buildings - Roof drainage, layout and calculation

Current

Published:

15 Sep 2000