World first sustainable drainage helps to combat climate change

A new type of water processing unit is being trialled at Mamhilad Park Estate with the aim of harvesting rainwater.

Designed and manufactured by WPU Limited, the BlueSquirrel Water Processing Unit is free standing and does not need to be embedded in any material such as stone or sand. It mimics natural drainage, is maintainable, reusable and recyclable, and is low maintenance for users. It is believed to be the only maintainable harvesting soakaway in the world. 

As a Sustainable Drainage System (SuD), the BlueSquirrel Water Processing Unit is able to store runoff rainwater, filtering out pollutants and allowing it to be harvested and recycled as greywater. The system allows surplus water to soak slowly into the ground via a system of filters which control the flow of the water.

Jeremy Mead is the CEO of WPU and the man behind the BlueSquirrel Water Processing Unit. He said: “Sustainable drainage is a legal requirement in Wales and will be mandatory for most new builds in England from this year. In general terms, it reduces flood risk and improves water quality but here at Mamhilad, the BlueSquirrel Water processing Unit will be used to collect, recycle and distribute water for use in the lavatories and gardens. We estimate that this one alone will save over 100,000 litres of water a year resulting in significant carbon savings.”

James Crawford, Chief Executive of Johnsey Estates UK Limited said: “Sustainable drainage systems can contribute to sustainable development and improve the places and spaces where we live and work. Indeed, they are an increasingly important part of our green infrastructure and will help in the battle against climate change.”