Kavacık Paşabahçe Beykoz Waste Water Collection project was built for collecting waste water from Beykoz District and conveyance to Paşabahçe Waste Water Treatment Plant.

There were 7,200 m / 2.2 m TBM Tunneling, 1,800 m / 1.2 m Hand Driven Tunneling, 12 7.5 meter tunnel shaft and 8 connector tunnel shaft.