DA1: 4 of 268 postcodes stand below a spring high tide

The ground at 4 of DA1's 268 postcodes (1%) 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 6.4 m and 29 m, measured from Ordnance Datum; the middle one stands at 13 m.
• 15 of 268 stand lower than the 1953 tide (5.41 m).
• 20 lie in the Environment Agency's Flood Zone 3 from the sea, mapped without defences.
• In Bexley.