Nedre Romerike Vannverk IKS plans to double the water pipeline through Tretjerdalen. NRV would like to increase the capacity in the water supply, as well as ensure better redundancy security through the valley by constructing a doubling of the pipeline between the two magazines. Connections are to be established to the existing raw water tunnel in Tretjerndalen east and Tretjerndalen west.

Nedre Romerike Vannverk IKS plans to double the water pipeline through Tretjerdalen. NRV would like to increase the capacity in the water supply, as well as ensure better redundancy security through the valley by constructing a doubling of the pipeline between the two magazines. Connections are to be established to the existing raw water tunnel in Tretjerndalen east and Tretjerndalen west.