SE5: 331 of 881 postcodes stand below a spring high tide

The ground at 331 of SE5's 881 postcodes (38%) 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 2.8 m and 29 m, measured from Ordnance Datum; the middle one stands at 5.6 m.
• 431 of 881 stand lower than the 1953 tide (5.41 m).
• 274 lie in the Environment Agency's Flood Zone 3 from the sea, mapped without defences.
• Mostly in Southwark; partly in Lambeth.