SE10: 227 of 848 postcodes stand below a spring high tide

The ground at 227 of SE10's 848 postcodes (27%) 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 2.3 m and 17 m, measured from Ordnance Datum; the middle one stands at 5.4 m.
• 426 of 848 stand lower than the 1953 tide (5.41 m).
• 482 lie in the Environment Agency's Flood Zone 3 from the sea, mapped without defences.
• Mostly in Greenwich; partly in Lewisham.