TW8: 8 of 534 postcodes stand below a spring high tide

The ground at 8 of TW8's 534 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 5.8 m and 12 m, measured from Ordnance Datum; the middle one stands at 10 m.
• 32 of 534 stand lower than the 1953 tide (5.41 m).
• 83 lie in the Environment Agency's Flood Zone 3 from the sea, mapped without defences.
• Mostly in Hounslow; partly in Ealing.