Groundwater chemistry of the Piako catchment, Hauraki Plains

Report: TR 1993/07

Author: JC Hadfield

This study is part of a larger investigation of the Piako catchment groundwater resources.

The Piako catchment comprises an area of approximately 1435km² of predominantly dairy farmland in the Hauraki Plains. Surface water resources in the catchment area is limited. Groundwater supplies some 80 per cent of farms and about half of the total water supply to the area.

The major content of this report is a presentation of the results from a groundwater chemistry survey undertaken in December 1992. Time series analyses are not included but are recommended for future state of environment monitoring.