CPM offers SuDS solution and saves the trees

When Beech Developments began work on 142 properties at the Gwel Y Castell Housing site on the grounds of an old school and playing fields at Llandudno Junction in North Wales, the percolation tests indicated that soakaways were not possible due to the nature of the soil conditions. Beech Developments therefore, had to look at discharging the storm water through the Welsh Water network and following calculations of existing run-off rates, both the Environment Agency and Welsh Water agreed to a permissible discharge of 17 l/s from the whole development. This required flows to be attenuated on site for the 1% storm event which would be achieved using large precast concrete pipes and Hydro-Brakes® and Beech Developments included storage of 20% which allowed for the future effects of climate change as agreed with the Environment Agency. Beech Developments looked at both concrete and plastic pipework for the project but took the final decision of using precast concrete pipes from CPM due to there suitability under roads, strength and longevity, installation, maintenance and overall cost. The second phase of the scheme called for a retaining wall solution with Beech Developments using CPM’s Redi-Rock™ modular walling system as the ingenious system provided all the design and engineering required, as well as the big blocks being delivered in a timely fashion. John Gardiner, Technical Co-ordinator for Beech Developments said “the nature of retaining wall supplied by CPM offered ease of construction as well as an aesthetically pleasing solution and most importantly for Conwy Council, the ability to be placed extremely close to the land being retained, meaning on this development, not a single existing tree needed to be sacrificed.”

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