TW7: no postcode below a spring high tide, the lowest 0.5 m above it

TW7 on the relief of London, with a tide staff: Its lowest postcode is 0.5 m above a spring high tide.

No postcode in TW7 stands below an ordinary spring high tide at London Bridge. The lowest, TW7 6AE, is 0.5 m above it and 1.0 m below the tide of 1 February 1953.

Ground at eight in ten of its postcodes: between 7.0 m and 25 m, measured from Ordnance Datum; the middle one stands at 11 m.
14 of 757 stand lower than the 1953 tide (5.41 m).
26 lie in the Environment Agency's Flood Zone 3 from the sea, mapped without defences.
Mostly in Hounslow; partly in Richmond upon Thames.

Open TW7 on the map