What is it?
* Dam on North Tyne tributary with Kielder reservoir behind
* Water extracted from Tyne and pumped 8km uphill through huge pipes to holding reservoir
* Water then transported 40km in tunnels to River Wear and River Tees
* Water in Nissan car plant and oil refineries in Middlesborough
* Regulates flow of Tyne
* Wildlife conservation
* Tourism and recreation…