SW8: 352 of 855 postcodes stand below a spring high tide

The ground at 352 of SW8's 855 postcodes (41%) 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 2.1 m and 6.0 m, measured from Ordnance Datum; the middle one stands at 4.2 m.
• 686 of 855 stand lower than the 1953 tide (5.41 m).
• 552 lie in the Environment Agency's Flood Zone 3 from the sea, mapped without defences.
• Mostly in Lambeth; partly in Wandsworth.