TW1: no postcode below a spring high tide, the lowest 0.5 m above it

TW1 on the relief of London, with a tide staff: Its lowest postcode is 0.5 m above a spring high tide.

No postcode in TW1 stands below an ordinary spring high tide at London Bridge. The lowest, TW1 3DL, is 0.5 m above it and 0.9 m below the tide of 1 February 1953.

Ground at eight in ten of its postcodes: between 5.6 m and 10 m, measured from Ordnance Datum; the middle one stands at 7.6 m.
50 of 664 stand lower than the 1953 tide (5.41 m).
85 lie in the Environment Agency's Flood Zone 3 from the sea, mapped without defences.
Mostly in Richmond upon Thames; partly in Hounslow.

Open TW1 on the map