W14: 170 of 637 postcodes stand below a spring high tide

The ground at 170 of W14's 637 postcodes (27%) 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 3.5 m and 5.9 m, measured from Ordnance Datum; the middle one stands at 4.6 m.
• 528 of 637 stand lower than the 1953 tide (5.41 m).
• 198 lie in the Environment Agency's Flood Zone 3 from the sea, mapped without defences.
• Mostly in Hammersmith and Fulham; partly in Kensington and Chelsea.