E1W: 97 of 407 postcodes stand below a spring high tide

The ground at 97 of E1W's 407 postcodes (24%) 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 3.2 m and 13 m, measured from Ordnance Datum; the middle one stands at 5.5 m.
• 201 of 407 stand lower than the 1953 tide (5.41 m).
• 219 lie in the Environment Agency's Flood Zone 3 from the sea, mapped without defences.
• In Tower Hamlets.