Canvey Island barriers spanning Benfleet Creek to the north and East Haven Creek in the west. The drainage system consists of sewers, culverts, natural and artificial dykes and lakes which feed seven pumping stations and gravity sluices that discharge the water into the Thames and creeks. Four of the discharge sites are "high flow" stations capable of discharging 600 litres of water per second at any tide level. The levels within the system are managed by a further five "low flow" pumping stations. The Environment Agency's Thames Estuary 2100 flood defence plan includes Canvey Island as one site for alleviating the flood
John Sheppey John Sheppey John Sheppey (c. 1300 – 19 October 1360) was an English administrator and bishop. He served as treasurer from 1356 to 1360. Little is known of his family and background. A Benedictine, he was ordained deacon in 1318, and later studied at Oxford. Later he became involved in royal government, and was made bishop of Rochester on 22 October 1352. He was consecrated on 10 March 1353. He died on 19 October 1360, and was buried in Rochester Cathedral at the altar of St John the Baptist. As his will shows, he was a friend of his predecessor