Fires, spillages, failure of primary containment, vandalism - all these sorts of incidents on an industrial site can cause the release of hazardous substances into the environment. Once released, these hazardous substances can enter the water environment through surface or foul drainage systems, by direct runoff into a watercourse or by infiltration into the ground. Secondary containment systems, such as bunds, lagoons and transfer systems, can provide protection in the event of loss of containment of materials which could cause water pollution. This title enables the user to find the most appropriate secondary containment system. As well as detailed technical advice on the planning, design and construction of the various system options, it contains guidance to help designers choose the appropriate type and capacity of system with reference to assessed risk. Several case studies are included, which illustrate the types of incident that can happen, the consequences of inadequate containment and the remedial works that have been carried out.