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
Canvey Island census, the population of Canvey was 37,479 of which 87.9% of people were living within the five wards of the eastern area of the island at a population density of 38 persons per hectare, while the population density within the west ward – covering a larger area of the island – was 4.6 persons per hectare. There were 15,312 dwellings on Canvey of which 98.7% were households. 42.4% were occupied by married couples, 13.9% of households contained three or more adults and no children, 26% were one person households and 8.1% were occupied by co-habiting couples. Canvey had a higher