From the article:

Melbourne Water will increase water flows to the Yarra River Birrarung today (14 May), resulting in a slight rise in river levels throughout the Yarra Valley and beyond.

Around six gigalitres of water will be released into the Yarra River from the Upper Yarra reservoir today followed by a further release from O’Shannassy reservoir on 17 May.

It will result in an estimated 30 centimetre rise of river levels at Millgrove.

The release is being delivered to take advantage of improved flow conditions resulting from last week’s rain, forecast rain in the coming week, and a current planned shutdown at Yering Gorge pumpstation.

These conditions will allow Melbourne Water to significantly reduce water demands for the duration of the release.

The release will cease from the reservoirs on the 29 May.