SW11: 479 of 1,525 postcodes stand below a spring high tide

The ground at 479 of SW11's 1,525 postcodes (31%) 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 3.0 m and 19 m, measured from Ordnance Datum; the middle one stands at 4.6 m.
• 922 of 1,525 stand lower than the 1953 tide (5.41 m).
• 969 lie in the Environment Agency's Flood Zone 3 from the sea, mapped without defences.
• In Wandsworth.