Why is a sewer diversion required?

In order for the new Resource Recovery Facility (RRF) to be built as part of the NLHPP, a sewer diversion is required. 

Two sewer pipes, the Angel and the Chingford, currently run below the footprint of the future RRF and these need to be diverted along a new route to allow for construction to take place. The map below shows the existing and future routes for the sewer pipes.