A $70m waterpark featuring high-speed thrill rides and state-of-art water slides is to be built in the north-eastern suburbs of Perth, Australia.

In one of the most significant tourist attraction developments in Western Australia in decades, the park will sit on 4ha as part of The Maze Fun Park in Bullsbrook.

The $1.5m first stage – a three-storey-high waterslide playground with two tube slides, two flume slides, toddlers' slides, a 1,000-litre tipping bucket and a range of water cannons and interactive play features – is expected to be finished by December after getting planning approval from the City of Swan and a $250,000 grant from the Federal Government this year.