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News Release from: CIRIA | Subject: Designing for exceedance in urban drainage
Edited by the Buildingtalk Editorial
Team on 14 July 2006
Designing for exceedance in urban
drainage
CIRIA's new guidance Designing for exceedance in urban drainage - good practice provides advice for the design and management of urban sewerage and drainage systems.
Helping rain to drain Heat waves or prolonged periods of drought followed by intense rainfall can cause localised flash flooding
This article was originally published on Buildingtalk on 24 Feb 2004 at 8.00am (UK)
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In the event of extreme rainfall, the capacities of sewers, covered watercourses and other drainage systems can be tested to their limits.
If drainage capacity is exceeded surface flooding may occur.
The excess water (exceedance flow) is conveyed above ground, and will travel along streets and paths, between and through buildings and across open space along the path of least resistance.
Indiscriminate flooding of property can occur when this flow of water is not controlled.
This is especially problematic where the drain is a combined sewer and sewage flooding can result.
Experience has shown that much of the recorded flooding in urban areas is attributable to the passage of above ground surface flow.
However, much can be done to mitigate the effects if surface flood flow is managed proactively.
Recognising the importance of flood pathways along highways and other routes, and the storage of water in low spots, is the first step to better management.
Through good design, a second important step is to direct flood flows along routes where the risk to health and safety is minimal.
CIRIA's new guidance Designing for exceedance in urban drainage - good practice (C635) provides advice for the design and management of urban sewerage and drainage systems to reduce the impacts that arise when flows occur that exceed their capacity and explains how systems can be designed to safely and sustainably accommodate excess water during extreme weather events.
It aims to improve engineers, planners and designers' appreciation of the risks associated with urban drainage systems and how these risks may be mitigated.
Designing for exceedance in urban drainage - good practice (C635) is available to buy or download from CIRIA. Request a free brochure from CIRIA ...
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