The doors to our Whitianga and Paeroa offices will be closed for the summer break from 4pm on Friday, 20 December, while our Taupō and Hamilton offices will close for the summer break at 1pm on Tuesday, 24 December. All offices will reopen on Monday, 6 January 2025. To report air or water pollution, unsafe water activities in or on a river, lake or harbour, or make a general enquiry or information request during this time, call us 24/7 on 0800 800 401.

Close alert

Mapping residence times in west coast estuaries of the Waikato region

TR 2016/19
  1. Services »
  2. Publications »
  3. TR2016/19
Report: TR 2016/19

Author: Dougal Greer, Ed Atkin, Shaw Mead, Tim Haggitt and Sam O'Neill (eCoast)

About this report

Quantifying residence times in estuaries (i.e. how long water is retained within different partsof these water bodies) can improve our understanding of the fate of discharges within estuarine systems. Until now, relatively little work has been undertaken to investigate howlong water takes to flow through estuaries on the Waikato region’s west coast. This report describes the development of a methodology, or proof-of-concept, for mapping residencetimes in the seven largest estuaries along the Waikato west coast, namely Waikato Riverestuary, Whaingaroa (Raglan) Harbour, Aotea Harbour, Kawhia Harbour, Marokopa Riverestuary, Awakino River estuary and Mokau River estuary.

Read or download the report

Mapping residence times in west coast estuaries of the Waikato region [PDF, 21 MB]

Two page summary report [PDF, 900 KB]

Contents
  Executive Summary
  Contents
  Figures
  Tables
1 Introduction
2 Residence Times
3 Sensitivity Analysis
4 Discussion
5 Conclusions
6 Acknowledgements
7 References