Archive 2016 10

19 Sewerage and Drainage to a receiving water course – but crucially, this water is released at a controlled rate, reducing the flood risk that traditionally comes with peak flow rates. The Davington Park challenge Marshalls’ Priora permeable paving played a vital role in overcoming water management challenges for a recently constructed housing development in Kent. In a first for the area, Redrow Homes and Kent County Council tasked Marshalls with providing permeable paving for Davington Park, a series of New Heritage properties in Faversham. The aim was to achieve a housing development of unique architectural identity, with high-quality hard landscaping to help alleviate the impact of flooding and pollution. Permeable paving is not only a highly effective water management solution for a housing development, but also looks great and offers exceptional structural performance. It’s vital that all those involved in creating urban landscapes – from designers to construction workers to local authorities – take responsibility for implementing water management strategies, and protecting communities in a changing climate. SuDS integration continues to be a talking point from region-to-region, which is a good sign. It also makes it easier than ever for developers and builders to play their part in applying surface water solutions. n Providing a clear view of leaks Research shows more than 3.3 billion litres of treated water is lost through leaking pipes in England and Wales every day. With much of the UK’s water infrastructure dating back to Victorian times, regular monitoring is needed to combat cost and supply interruptions. After more than 20 years in the industry, Antony Scott from Leeds-based Ant Hire believes the scale of domestic and commercial leakage is worse than many people realise. “Unlike other essential infrastructure, the condition of drainage and plumbing is not always obvious and problems can lie underground, undetected for several years, he says.” The water industry supplier is the only licensed distributor of Hampshire-based Troglotech’s underground cameras, which are helping contractors to identify and tackle drainage issues. The CCTV systems range from the standard and versatile T804 to the one inch T710 camera for small spaces. Jason Brownes founder of national drainage contractor Forever Bubbles DrainPolice, has owned the T804 version for six years and says: “I can honestly say I use it every day to identify blockages and to check sewers for defects. “The main advantage is that it has a very good camera and is lightweight with a battery pack so I can take it everywhere including onto roofs and into tight spaces.” By using underground cameras, contractors are able to complete a range of drainage inspections to help tackle leaks and to identify and clear blockages, explains Brownes. “I was commissioned to provide a drainage asset investigation in Billericay, Essex for a proposed new housing scheme of 36 retirement flats. “The developers needed to know the condition and location of the drains underneath the proposed building site and I was asked to complete a full WinCan report looking for any damage, cracks or holes etc that would require any corrective action. “The Troglotech meant I could use screen shots from the camera as part of the report and could reach and inspect every inch of the drains to complete the report within about four hours.” n A class apart: What you need to know when it comes to drainage channels Drainage channels are by no means a ‘one size fits all’ solution. Phil Windus at ACO Technologies, delves deeper into drainage channel load classes, and explains why you need to know your A 15s from your B 125s Drainage channels are a vital part of most construction projects, but are easily wrongly specified, which can lead to failure if a product with the incorrect load class is installed. Low down on load classes In accordance with BS EN 1433:2002 all drainage channels are classified into load classes, effectively different categories detailing the load-bearing capacity of that product. Ranging 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 drainage will stand up to the rigours of the application. Let’s put the issue into context. A 15 is the most commonly used drainage channel. If we take a typical scenario of a new build property or garden and driveway renovation, then A 15 drainage channels would be suitable for use on pathways and patios. However, where the issues begin to arise is when an A 15 channel is installed at the driveway entrance or in the middle as the product does not have the load-bearing capacity to withstand the pressure of a car turning on it or if a delivery van or bin lorry pulled up outside the house and parked on it. It is likely that the material would soon buckle under the pressure and start to break apart, both turning it into a potential hazard and generally losing its aesthetic feel. In this instance, a B 125 channel would be best, which has a higher loadbearing capacity. Weakest link Another common pitfall is utilising channels and gratings from different load classes. For example, an A 15 channel fitted with a B 125 grating will still only deliver a load-bearing capacity equivalent to that of an A 15 system. Mixing and matching may be seen by some contractors as a way of cutting some of the cost out of a job, but ultimately it will undermine the strength of the total solution. The principle of matching load class to application applies to all types of drainage. For instance, B 125 would be sufficient for a small car park mainly used by domestic vehicles, but if vans or commercial vehicles use the same space then either a C 250 or D 400 solution is likely to be the best option. n ACO RainDrain B 125 is suitable for use on driveways Above ground view of the Troglotech T804 Troglotech subterranean view

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