The Billion-dollar Flush by Wayne Erb is an engaging non-fiction text that takes students deep beneath Auckland to explore one of New Zealand’s largest and most ambitious infrastructure projects: the Central Interceptor wastewater tunnel. Through clear explanations, diagrams, and real-world voices from engineers, geologists, and environmental advisors, students learn how science, technology, and engineering work together to solve complex urban and environmental problems.

This text supports students to build strong comprehension of complex informational texts, interpret technical vocabulary, and analyse how authors use structure, diagrams, and real examples to explain sophisticated ideas. The text also encourages critical thinking about sustainability, population growth, and human impact on waterways, helping students connect learning to real issues in Aotearoa New Zealand. This text is ideal for inquiry learning, STEM integration, and discussions about future-focused solutions for growing cities.

 

This pack includes three clearly structured lesson overviews designed to support close reading of The Billion-dollar Flush . Each lesson provides a direct link to the text, purposeful warm-up questions, focused do now activities, explicit teaching of key technical and subject-specific language, exit tickets, and opportunities for student self-assessment.

The three lesson overviews focus on:

1. Comprehension and inferencing, supporting students to locate information, make meaning, and draw conclusions from the text;

2. The author’s use of language and structure, exploring how word choice, sentence structure, and text features shape meaning; and

3. Author’s purpose and themes, encouraging students to think critically about ideas, messages, and viewpoints.

 

Curriculum Phase: Phase 3

Year Level: Year 8

English – Reading: comprehension of complex non-fiction, technical vocabulary, author’s purpose, text structure and features, integrating information from text and diagrams, making connections to real-world issues

Technology – Technological Knowledge: large-scale engineering systems, problem-solving and design, infrastructure development, evaluating technological solutions, future-focused planning

Science: environmental impact, water systems, sustainability, human impact on ecosystems

Text Type: Non-fiction / informational report with diagrams and explanatory text

 

Key words include: Aotearoa New Zealand, Auckland, Central Interceptor, diagrams, engineering, engineers, environmental impact, flooding, geotechnical engineering, geologists, groundwater, infrastructure, informational text, pipes, pollution, population growth, pumps, sewerage, sewerage networks, sewage, sewers, STEM, stormwater, sustainability, technical vocabulary, technology, treatment plants, tunnel-boring machine, tunnels, urban growth, water systems, waterways, wastewater.