GROUNDWORKS 33 A FLOOD OF ENQUIRIES
With many homes still being built on flood plains, and flooding an increasing risk, there are a host of issues for housebuilders to address when it comes to drainage. Chris Green of ACO Water Management explains further.
S
ince 2013, one in 10 of all new homes in England have been built on land which is at the highest risk
of flooding, amounting to 85,000 homes. When you consider that the UK weather
is increasingly unpredictable, and what were previously one in 50 chance storm-level events are happening more regularly, there is a clear need to position water management as a top priority in residential projects.
SUSTAINABLE DEVELOPMENT Sustainability is of course a major trend across construction, and the anticipated update to the Environment Bill looks set to cement this focus. For housebuilding in particular, there is a big push to ensure water management solutions contribute positively to the surrounding environment. Sustainable drainage systems (SuDS)
are a key component of this, aiming to control the rate and volume of runoff from site, relieve pressure on sewerage systems, and mimic natural drainage as closely as possible. Used effectively, they can help housebuilders deliver green water management that is built to last, and should be an integral part of a
project’s planning. There is also an onus on housing
developers to minimise their impact on biodiversity. From a water management perspective, this can often mean installing wildlife guidance systems in cases where the migration of small animals is interrupted.
LOAD CLASS REQUIREMENTS Getting to grips with the different drainage load class requirements is another key aspect of delivering effective drainage to a housebuilding project. There are a number of different standards which must be adhered to, depending on the application and location of the drainage channel. In accordance with BS EN 1433:2002, all channels are rated according to one of six load classes. These are effectively different categories that detail the maximum load-bearing capacity of that product, and range from A 15 for pedestrian footpaths and patios, through to F 900 for airports and industrial yards. The system is a quick way of ensuring that the right channel and grating is selected. There are some common pitfalls that housebuilders should be aware of when it
WITH STORM-LEVEL EVENTS HAPPENING MORE REGULARLY, THERE IS A CLEAR NEED TO POSITION WATER MANAGEMENT AS A TOP PRIORITY IN RESIDENTIAL PROJECTS
comes to load class. One is that some channels are compatible with different gratings – some builders may be tempted to choose an A 15 grating with a B 125 channel, or vice versa. In this situation, the load class of the system will default to the lowest load class. Another pitfall is underestimating the
pressure that driveways are likely to be subjected to. The ever-increasing presence of home delivery vans means that more large vehicles are encountered on driveways than ever before. B125 channels and gratings should be considered as a minimum.
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