The council initially opted for option (a) but an inability to install a suitable foundation and a large flood caused this to be abandoned in favour of Climie's Option (c) which involved construction on the Waiwhakaiho River of a new intake 25 chains (502 m) further upstream, which diverted water by means of a 22 chain (442 m) long water race, 100 feet of which consists of a tunnel into the Mangamahoe Stream, where a 13 ft (3.96 m) high concrete gravity dam was constructed in 1914, just downstream of where the original tunnel had crossed it.