Lisa said the Opua business community had donated and fitted almost everything.
"The only thing we had to buy was the pipes," she said.
Rebecca said the idea was originally mooted by a teacher but took on a life of its own after they picked it up. They made presentations to Bay of Islands Rotary and Focus Paihia, and tried to get permission to install it on Paihia Wharf.
That turned out to be a lesson on dealing with the adult world where phone calls, emails and letters go unanswered. In the end, with both girls due to start at high school this year, they decided to install their prototype in the school playground instead.
However, their presentation to the town beautification group Focus Paihia was so convincing the project is now set to go ahead as originally envisaged.
At its last meeting the group voted to allocate more than $3000 to a dolphin water station made of stone which will be a permanent feature of the waterfront.
Chairman Grant Harnish said it was a lot of money but the group "really, really liked it" and the girls' pitch was convincing and professional.
Mr Harnish hoped the water station would encourage other young people to get involved in similar projects.