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Tongariro River flood protection scheme - Service level review

TR 2017/41

Report: TR 2017/41

Author: Duncan Grant

About this report

The Waikato Regional Council (WRC) manages the flood protection and river management assets (e.g. stopbanks, floodwalls, floodgates, rock revetments and associated river structures and works) along the Tongariro River. Together, these assets and works are designed to provide protection against floods up to a 1%AEP event. To ensure service level delivery the assets and works are monitored and surveyed and their performance assessed regularly.

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Tongariro River flood protection scheme - Service level review [PDF, 3.3 MB]

Contents

Executive summary
1 Introduction
1.1 Purpose
1.2 Background
2 Flood protection scheme
3 Survey
3.1 LIDAR 2016
3.2 Channel survey
3.3 Scheme asset crest survey
4 Hydrology
4.1 Flow record
4.2 Design discharge
4.3 Design hydrograph
4.4 Lake levels
5 Hydraulics
5.1 MIKE11 model
5.1.1 MIKE11 model development
5.1.2 MIKE11 model results
5.2 MIKE21 2D model
5.2.1 MIKE21 model development
5.2.2 MIKE21 model scenarios
5.2.3 MIKE21 model results
6 Service level review of flood protection assets
7 Analysis of channel survey data
8 Conclusions
9 Recommendations