SW13: 28 of 373 postcodes stand below a spring high tide

The ground at 28 of SW13's 373 postcodes (8%) 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 4.0 m and 6.3 m, measured from Ordnance Datum; the middle one stands at 5.0 m.
• 261 of 373 stand lower than the 1953 tide (5.41 m).
• 304 lie in the Environment Agency's Flood Zone 3 from the sea, mapped without defences.
• In Richmond upon Thames.