National Grid are currently designing a 3.5m diameter tunnel that will run under several parts of London. The Wimbledon to Kensal Green tunnel will run under the CHDL site (i.e. a vacant site that Chelsea Harbour Limited own) and it will also run under Harbour Avenue adjacent to the CHL site (A group of buildings that Chelsea Harbour also own at a depth of approx 30 to 35m.
Fluid were asked to advise Chelsea Harbour (CH) on the impact of the tunnel and assist with the drafting of legal agreements for both sites. Before the tunnel is constructed legal agreements need to be prepared and any additional costs that arise due to the tunnel need to be covered and agreed by CH and National Grid. Also the impact on any future development that CH wish to carry out needs to be assessed.
When the tunnel is formed it causes a settlement trough (currently estimated by National Grid to be 5mm based on a 1.5% volume loss). The tunnel will place restrictions on both sites and can potentially limit CH’s ability to develop their sites in the future.