SE11: 338 of 496 postcodes stand below a spring high tide

The ground at 338 of SE11's 496 postcodes (68%) 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 4.3 m, measured from Ordnance Datum; the middle one stands at 3.7 m.
• 490 of 496 stand lower than the 1953 tide (5.41 m).
• 472 lie in the Environment Agency's Flood Zone 3 from the sea, mapped without defences.
• Mostly in Lambeth; partly in Southwark.