[holding answer 17 September 2008]: The following table shows the number of critical facilities sites at risk of flooding. The Environment Agency is unable to give the location of these sites for national security reasons.
Asset Significant (1 in75) Moderate (1 in 75-200) Low (1 in 200 or fewer) Total in all three zones Water and sewerage (Number) 737 223 179 1,145 Electricity, generation and distribution (Number) 2,215 2,263 3,818 8,423 Gas, works and distribution (Number) 5 8 10 23 Telephone exchanges (Number) 82 67 86 241 Motorways (Kilometres) 139 104 132 382 A roads (Kilometres) 884 553 809 2,278 Railway lines (Kilometres) 1,470 750 948 3,213 Note: Taken from an Environment Agency study showing infrastructure overlain on flood risk maps (river and sea floodplains).