The story of the diminutive Dutch boy who stuck his finger in the dyke is a salutary lesson that prevention is better than cure – especially when it comes to waterproofing. And Firestone Building Products has also proved that it’s no longer small fry, having gone from PondGard linings for residential landscaping up to civil engineering scale with its new GeoGard EPDM product. Running up to 15.25m wide and 61m in length and as used at the reassuringly geometric  27,000m2 Les Groies irrigation reservoir in France (above), it’s perfect for when you  want to pander to your inner Le Nôtre.