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Guide for the drainage of development sites Specialists at HR Wallingford have recently produced a guidance manual for the planning and design of

drainage of development sites. The work has been carried out under the Partners in Innovation scheme run by the DTI. ‘ T

he Manual is intended for use by general engineering practitioners, as well as developers and

architects,’ says Richard Kellagher who co-led the project. ‘It is a useful reference for guidance and information on all aspects relating to the hydraulics of site drainage.’

General information on the planning process and the approach needed to obtain planning consent is provided in the first section. This process can involve a range of different organisations depending on the type of development and the pipe system or river receiving the discharges.

Subsequent chapters provide technical information on the design of drainage systems, starting with roofs and progres- sing ‘downhill’ to pavements and basements.

A balancing pond in a new development

A section on Sustainable Drainage Systems (SUDS) sets out the various types of unit and the design principles that need to be considered. The final chapter, on site storage design, includes a summary of research carried out by HRW on behalf of Government into drainage storage assessment for greenfield sites. Copies of Guide for the Drainage of Development Sites (SR 574), costing £50 (plus p&p outside the UK), are available from: Publications, HR Wallingford Ltd, (01491 835381; fax: 01491 832233; E-mail:

For further information about this work, please contact Richard Kellagher (01491 822419; fax: 01491 825916; E-mail:

Guidance on improving the flood resistance of domestic and small business properties Recent flooding events across the UK have shown the devastating impact that flooding can have on people’s lives and

businesses. During the Autumn 2000 floods alone, over 10,000 homes and businesses were flooded, causing damage to property and severe distress to thousands of people across the country. Whilst it is not possible to eliminate the risk of flooding, many practical steps can be taken to reduce the cost of flood damage repairs and speed up recovery times.


new DTLR guidance document Preparing for floods aims to provide best practice information on measures that can be taken to improve the flood resistance of both new and existing properties at risk of flooding. The document has been prepared in response to a recommendation made by the Parliamentary Select Committee for the Environment, Transport and Regional Affairs following the Autumn 2000 floods. The guide is aimed at:

• existing homeowners and small businesses whose properties are at risk of flooding;

• developers, builders, local planning authorities, building control bodies and others involved with: – construction of new properties in areas of flood risk

– renovation of existing buildings in areas of flood risk.

During the preparation of the guide, information was drawn from Government, the insurance industry, local authorities and, most importantly, families and small businesses who have been through the experience of a major flood. This is the first time that best available information on improving flood resistance of buildings has been collated within one document. The guide does not attempt to solve all

Research Focus NO. 48 FEBRUARY 2002

problems associated with flood damage but it provides a range of common-sense solutions and references to more detailed reading. It provides advice to existing homeowners and small businesses on how to assess the risk of flooding in a particular location, and guidance on selecting appropriate measures to improve flood resistance of property. These include measures to prevent or reduce the volume of floodwater entering a building, including the use of temporary flood barriers, and on permanent measures to improve the flood resistance of the building structure (including walls, floors, building services and fittings).

Guidance is also provided for developers, local authorities, building control bodies and others to use on new development in high flood risk areas. It provides a general introduction to the role of the Government’s Planning and Policy Note 25: Development and Flood Risk, and guidance on the forms of construction that are most appropriate for developments at risk of flooding. The project has been undertaken by WS Atkins Consultants Ltd with joint funding provided by DTLR, DTI Construction Industries Directorate, Environment Agency, Scottish Executive, Association of British Insurers, National House Building Council, and the House Builders Federation. The steering group included the funders together with CIRIA, BRE and HR Wallingford. The guide is published as ‘Interim Guidance’ and will be periodically reviewed and updated as comments are received and new information becomes available. An electronic version of the guide will be made available on the DTLR website.

For further information please contact Jim Leat of WS Atkins, Woodcote Grove, Ashley Road, Epsom, Surrey, KT18 5BW (01372 726140; fax: 01372 740055; E-mail: Website:

Autumn 2000 flooding 5

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