After the severe flooding of 2014 in the Staines area and the backing up of the foul system in the main road, a large office block ended up with sewage on the car park and leading to the office door which resulted in the office being closed for several days with a large loss of revenue. It was decided to install a complex set of pumps/valves and a concrete holding tank beneath the car park but above the water table for ease of installation. Automatic back flow valves and warning beacons are the first signs of an ensuing problem. The office then has 24 hours of holding capacity where by either the drains clear or the contents of the holding tank get tankered away off site. If the drains clear the pumps automatically empty the tank ready for the next occasion.