 A further improvement was made in 1951 when a concrete @-@ lined channel was constructed to divert stream flow from the nearby <unk> Gully catchment . The Canning Dam and reservoir was Perth 's primary source of water until the boom growth of the city in the 1960s and the completion of <unk> Dam in 1961 . In 1975 the reservoir was connected to Perth 's Integrated Water Supply Scheme by the Canning Tunnel . Prior to its opening water had flowed through the Canning <unk> Channel to <unk> . 
