Elsham The new pumping station, made from concrete with a steel frame, will be about nine metres high. There will also be a new water storage tank, also known as a reservoir. It will be about six metres high, made of concrete and have a capacity of 25 megalitres – about the same as 10 Olympic-size swimming pools. The water conditioning plant, used to monitor the quality of the water entering the storage tank, will be about three metres high. There will also be a drainage pond, also known as an attenuation pond, which will be used as an overflow area for the storage tank.