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  Services » Publications » Technical reports - by year » tr200504

Hydraulic travel times of major Waikato rivers

Report: TR05/04
Author: Edmund Brown

Abstract

The purpose of this report is to provide quick reference charts of estimated travel times along major Waikato rivers in response to emergency situations such as hazardous spillages.

The term 'travel time' is simply the calculated time it takes for a body of water to travel between two points. The rivers and streams analysed are those most at risk of contamination by hazardous substances due to their proximity to major roads and railways.

The travel times are based on measurements of river and stream length, discharge and mean velocity. The travel times for each of the rivers and streams analysed are presented for two reference flows, the 15th and 85th percentile flows. The 15th percentile flow represents high flow conditions which are equalled or exceeded 15 percent of the time and the 85th percentile flow represents low flow conditions which are equalled or exceeded 85 percent of the time.

The flow velocities of the various flow gauging sites in each catchment are referenced to one location, the reference site. This negates the need for the user of the tables to have flow measurements for all the sites.

Note: The travel times given are only approximate and provide a first approximation for emergency instance planning purposes. However, due to the number of assumptions and limitations used in the calculations there may be considerable variation between what is reported here and what actually occurs for each water body.

Hydraulic Travel Times of Major Waikato Rivers
(802 kb, 114 seconds to download, 56k modem)

Table of Contents

1 Introduction 1
2 How to use the travel time tables 1
3 Calculation of the travel times 3
3.1 Limitations 4
3.1.1 Discharge and velocity estimates 4
3.1.2 Tidal influence 4
3.1.3 Transport mechanisms and chemistry 4
3.1.4 Storage lakes 4
4 Waikato River 6
4.3 Western Bays of Lake Taupo 12
5 Waipa Catchment 13
5.1 Mangapiko River to Waikato Heads 14
5.2 Punui River to Waikato Heads 16
5.3 Mangaoronga Stream to Waikato Heads 18
5.4 Mangapu Stream to Waikato Heads (includes Waipa River downstream of Otorohanga) 20
5.5 Mangaokewa Stream to Waikato Heads (includes Waipa River downstream of Otorohanga) 22
6 Waihou River 24
6.1 Kuhatahi Stream to Waihou River Mouth 26
6.2 Purere Stream to Waihou River Mouth 27
6.3 Oraka Stream to Waihou River Mouth 28
6.4 Rapurapa and Waiomou Streams to Waihou River Mouth 29
6.5 Mangawhero Stream to Waihou River Mouth 30
6.6 Ohinemuri River to Waihou River Mouth 31
7 Piako River 32
7.1 Morrinsville to Piako River Mouth 33
7.2 Waitoa River to Piako River Mouth 34
8 Awakino River 36
8.1 Awakino River 37
9 Mokau River 38
9.1 Herekawe Stream to Mokau River Mouth 39
9.2 Pangaki and Mangaotaki Streams to Mokau River Mouth 40
10 References 41
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