SW1E: 29 of 83 postcodes stand below a spring high tide

The ground at 29 of SW1E's 83 postcodes (35%) 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 3.3 m and 5.1 m, measured from Ordnance Datum; the middle one stands at 4.3 m.
• 82 of 83 stand lower than the 1953 tide (5.41 m).
• 79 lie in the Environment Agency's Flood Zone 3 from the sea, mapped without defences.
• Mostly in Westminster; partly in Wandsworth.