The project comprises a 4km piped replacement of the Callowhill Tunnel, an 80 megalitre/day treatment plant and an 80 megalitre storage reservoir supplying 200,000 consumers. It had numerous stakeholders and interest groups coupled with critical interfaces including SAC’s and Grade A dams. Planning permission was a significant risk which led to its division into three independent projects. The consultant prepared a detailed Stakeholder Engagement Plan and assigned a senior resource to manage same. A highly complex and critical project which would not have enjoyed the ultimate success that it did without expert engineering project management.