This is Huka Falls, coming off Lake Taupo. From the web page:
"Around 220,000 litres per second of pours over the cliff face, and then rushes under a pedestrian bridge (great photo opportunity here!) The water then bursts out of its rapids, over the 11 metre falls, and back into the Waikato River."
To give an idea of how much water that is, an Olympic-size swimming pool is ~ 2,500,000 litres. That means Huka Falls dumps the same volume every 11 seconds. Pictures do not come close to describing the volume and intensity of these rapids.