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

Summer dissolved oxygen conditions in six streams in the Waihou catchment, 2009

TR 2014/11
  1. Services »
  2. Publications »
  3. TR2014/11

Report: TR 2014/11

Author: Paul Franklin, National Institute of Water and Atmospheric Research Ltd

About this report

In small streams that are heavily abstracted, reduced flows can result in slower velocities in the lower reaches and amplify the nocturnal sag in dissolved oxygen (DO) levels associated with the dense macrophytes commonly present. Currently, little is known about the extent of these water quality impacts on fish or whether fish migration and/or habitat in small streams is compromised.

Read or download the survey report

Summer dissolved oxygen conditions in six streams in the Waihou catchment, 2009 [PDF, 1.1 MB]

Contents
  Executive summary
1 Introduction
2 Monitoring sites
2.1 Site descriptions
2.2 Methodology
2.3 Data analysis
3 Results
3.1 Flows
3.2 Dissolved oxygen
4 Discussion
5 Conclusion
6 References