hebden 40 porous paving - calculating rainwater run-off

This shows you how to calculate the amount of rainwater run-off you can avoid by installing Hebden 40 porous paving from British Recycled Products instead of tarmac (asphalt) in car parks. This reduces the stresses on urban drainage and thereby minimises flooding risks. For more information, go to britishrecycledproducts.co.uk