In most river basins, the total approved short-term water use is a fraction of the mean annual runoff. In 2012, 3.77 million m3 of water was reported as used. The water reported as used was 18.5 per cent of the total approved for use in 2012.
The volume of water used per well ranges from 10,000 to 70,000 m3 depending on the targeted formation. For the majority of basins, approved water use corresponds to less than 0.2 per cent of mean annual runoff. Actual water use as reported by the approval holders in individual basins is a small fraction of the approved water use, and was less than 0.075 per cent of mean annual runoff in all river basins between January and December 2012. Basins with the largest total approved water volumes as a percentage of mean annual runoff are listed in the Annual Report on Water Use in Oil and Gas Activities.