SE28: 317 of 438 postcodes stand below a spring high tide

The ground at 317 of SE28's 438 postcodes (72%) 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 1.1 m and 5.8 m, measured from Ordnance Datum; the middle one stands at 2.3 m.
• 373 of 438 stand lower than the 1953 tide (5.41 m).
• 332 lie in the Environment Agency's Flood Zone 3 from the sea, mapped without defences.
• Mostly in Greenwich; partly in Bexley.