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
Estuary English more widely spoken in parts of Sussex, Hampshire, Bedfordshire, Berkshire, Buckinghamshire and Middlesex as well. Estuary English shares many features with Cockney, and there is some debate among linguists as to where Cockney speech ends and Estuary English begins. The variety first came to public prominence in an article by David Rosewarne in the "Times Educational Supplement" in October 1984. Rosewarne argued that it may eventually replace Received Pronunciation in the southeast. Studies have indicated that Estuary English is not a single coherent form of English; rather, it has some of the phonetic features of working-class London speech spreading at