SE7: 47 of 432 postcodes stand below a spring high tide

The ground at 47 of SE7's 432 postcodes (11%) 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 3.7 m and 49 m, measured from Ordnance Datum; the middle one stands at 25 m.
• 74 of 432 stand lower than the 1953 tide (5.41 m).
• 67 lie in the Environment Agency's Flood Zone 3 from the sea, mapped without defences.
• In Greenwich.