Taylor, C.B 1979 Measurements of oxygen-18, deuterium and temperature in natural waters in the Lake Waikaremoana region, relating to the problem of sub-surface drainage through the lake barrier. Lower Hutt: DSIR, Institute of Nuclear Sciences. INS-R-- / Institute of Nuclear Sciences 263. 24 p.
Abstract:
Lake Waikaremoana is confined by a steep barrier resulting from two landslides across its SE corner. Despite hole-plugging of the lake-bed during the early 1950's about 4 cubic m/s of the outlet flow still occurs by drainage through the barrier, and is not intercepted by at least one of the three hydroelectric power stations utilising the lake's stream outflow. Sources of water emerging on the landslide were identified using oxygen-18, deuterium and temperature measurements, as an aid to future management policy regarding plugging of the remaining leakage through the barrier. The lake water drainage is shown to penetrate only through the more permeable material of the upper landslide, emerging from the centre of the landslide in the vicinity of Kaitawa power-house. The small lakes, streams and springs on the western part of the landslide derive from adjacent catchments on and to the west of the landslide
