SW3: 9 of 868 postcodes stand below a spring high tide

The ground at 9 of SW3's 868 postcodes (1%) 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 5.3 m and 7.8 m, measured from Ordnance Datum; the middle one stands at 6.7 m.
• 95 of 868 stand lower than the 1953 tide (5.41 m).
• 61 lie in the Environment Agency's Flood Zone 3 from the sea, mapped without defences.
• Mostly in Kensington and Chelsea; partly in Lambeth.