RM13: 169 of 655 postcodes stand below a spring high tide

The ground at 169 of RM13's 655 postcodes (26%) 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 2.8 m and 9.5 m, measured from Ordnance Datum; the middle one stands at 6.3 m.
• 271 of 655 stand lower than the 1953 tide (5.41 m).
• 166 lie in the Environment Agency's Flood Zone 3 from the sea, mapped without defences.
• In Havering.