E6: 384 of 923 postcodes stand below a spring high tide

The ground at 384 of E6's 923 postcodes (42%) is lower than an ordinary spring high tide at London Bridge (3.9 m above Ordnance Datum).

• Ground at eight in ten of its postcodes: between 1.4 m and 8.1 m, measured from Ordnance Datum; the middle one stands at 4.5 m.
• 542 of 923 stand lower than the 1953 tide (5.41 m).
• 467 lie in the Environment Agency's Flood Zone 3 from the sea, mapped without defences.
• In Newham.