The Waiareka scheme was opened in 1976 and takes 450 litres per second of water from the north side of the Waiau River at an intake point east of the Waiau Township. This scheme waters over 400ha on eight farms by border dyke and spray irrigation from a single flow race on a 12 day rotation.

Water is fed into a settling pond with two fish bypass races adjacent to the fish screen leading back to the river. The fish screen is rotated using a paddle wheel as there is no electricity on site. There are two discharge points for unused water toward the bottom of the scheme.

In July 2018, we started a project to install a 5km pipe and pond at Waiareka. This is due for completion in October 2018.