The measurements are shown in metres above sea level. The main operating range for Lake Manapōuri (as defined by the Lake Level Guidelines 2002) is between 176.8 and 178.6 metres above sea level. Operation outside this range is allowable in compliance with the guidelines.
These levels shown are provisional and are indicative only and for general information purposes, and do not try to show what actual levels will be at any particular time or place. If you intend to use the hydro lakes for any recreational or other purpose, please ensure that your activity can be safely carried out if the actual water levels change.