Manual for the Design of Roof Drainage Systems - A guide to the use of European Standard BS EN 12056-3:2000 - Report SR 620 - March 2003

Oct 29, 2026

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Manual for the design of roof drainage systems provides comprehensive guidance for designing building roof drainage using European Standard BS EN 12056-3:2000. It is intended to be used together with BS EN 12056-3 and organizes content into chapters covering rainfall data, effective catchment area, design flow loads, gutter capacities (free and restricted discharge), outlets, flat roof drainage, overflow weirs, internal rainwater pipes and drains, and siphonic systems. Each chapter includes background and detailed calculation steps, supported by worked examples.

LanguageEnglish

CategoryResearch & Report

FormatPDF

Pages78

Reading Time3 h 17 min

AccessFree to download

1. Introduction

2. Layout and scope of Manual

3. Rainfall data

3.1 Background information

3.2 Calculation steps

4. Effective catchment area

4.1 Background information

4.2 Calculation steps

5. Design flow loads

5.1 Background information

5.2 Calculation steps

6. Gutters with free discharge

6.1 Background information

Manual for the Design of Roof Drainage Systems A guide to the use of European Standard BS EN 12056-3:2000 R W P May Report SR 620 March 2003 Manual for the Design of Roof Drainage Systems A guide to the use of European Standard BS EN 12056-3:2000 R W P May Report SR 620 March 2003 􀀁􀀂􀀃􀀄 Address and Registered Office: HR Wallingford Ltd. Howbery Park, Wallingford, OXON OX10 8BA Tel: +44 (0) 1491 835381 Fax: +44 (0) 1491 832233 Registered in England No. 2562099. HR Wallingford is a wholly owned subsidiary of HR Wallingford Group Ltd. 􀀁􀀂􀀃􀀄 ii SR 620 10/03/03 Contract - Research This report was prepared as part of an in-house project funded wholly by HR Wallingford. The HR job number was DFT0141, and the work was carried out by Mr R W P May of the Water & Industry Group. Prepared by .......................................................................................... (name) (Title) Approved by .......................................................................................... (name) (Title) Authorised by .......................................................................................... (name) (Title) Date © HR Wallingford Limited 2003 This report is a contribution to research generally and it would be imprudent for third parties to rely on it in specific applications without first checking its suitability. Various sections of this report rely on data supplied by or drawn from third party sources. HR Wallingford accepts no liability for loss or damage suffered by the client or third parties as a result of errors or inaccuracies in such third party data. HR Wallingford will only accept responsibility for the use of its material in specific projects where it has been engaged to advise upon a specific commission and given the opportunity to express a view on the reliability of the material for the particular applications. 􀀁􀀂􀀃􀀄 iii SR 620 10/03/03 􀀁􀀂􀀃􀀄 iv SR 620 10/03/03 Summary Manual for the design of roof drainage systems A guide to the use of European Standard BS EN 12056-3:2000 RWP May Report SR 620 March 2003 This manual provides comprehensive guidance on how roof drainage systems for buildings should be designed using information given in European Standard 12056-3:2000 “Gravity drainage systems inside buildings – Part 3: Roof drainage, layout and calculation”. The manual is intended to be used in conjunction with BS EN 12056-3 and contains separate chapters dealing with the following topics: 􀀁 Rainfall data 􀀁 Effective catchment area 􀀁 Design flow loads 􀀁 Capacity of freely-discharging gutters 􀀁 Outlets from gutters 􀀁 Capacity of gutters with restricted discharge 􀀁 Drainage of flat roofs 􀀁 Overflow weirs 􀀁 Rainwater pipes and drains inside buildings 􀀁 Siphonic systems. Each Chapter consists of two parts. The first provides background information, either explaining the basis of the recommendations in BS EN 12056-3 or, in some cases, giving additional data. The second part describes in detail the steps that should be followed in the calculations. A series of worked examples is also included to illustrate the design procedures. 􀀁􀀂􀀃􀀄 v SR 620 10/03/03 􀀁􀀂􀀃􀀄 vi SR 620 10/03/03 Contents Title page i Contract iii Summary v Contents vii 1. Introduction ................................................................................................ 1 2. Layout and scope of Manual ...................................................................... 3 3. Rainfall data ............................................................................................... 4 3.1 Background information................................................................ 4 3.1.1 Rainfall characteristics ..................................................... 4 3.1.2 Design rainfall duration .................................................... 4 3.1.3 Geographical location...............

FAQs

What standard does this manual guide the design around?

The manual provides guidance for roof drainage system design using European Standard BS EN 12056-3:2000 and is intended to be used in conjunction with it.

What major topics are covered in the manual chapters?

Chapters address rainfall data, effective catchment area, design flow loads, gutter capacities for free and restricted discharge, outlet arrangements, flat roof drainage, overflow weirs, internal rainwater pipes and drains, and siphonic systems.

How is each chapter structured for performing calculations?

Each chapter has two parts: background information (including explanations of recommendations and, in some cases, additional data) and detailed calculation steps, plus worked examples demonstrating the design procedures.

Oct 29, 2026

Upload by Hazel