W6: 98 of 769 postcodes stand below a spring high tide

The ground at 98 of W6's 769 postcodes (13%) 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 3.8 m and 5.7 m, measured from Ordnance Datum; the middle one stands at 4.8 m.
• 595 of 769 stand lower than the 1953 tide (5.41 m).
• 699 lie in the Environment Agency's Flood Zone 3 from the sea, mapped without defences.
• Mostly in Hammersmith and Fulham; partly in Hounslow.