The Billion-dollar Flush – School Journal Year 7-8 November 2025

This article explains how Auckland’s wastewater is collected through the newly-built Central Interceptor tunnel. It describes the key people and machinery behind New Zealand’s largest-ever wastewater project.

Keywords: Auckland, Central Interceptor, engineering, engineers, flooding, geologists, groundwater, pipes, pollution, pumps, sewage, sewerage networks, sewers, stormwater, treatment plants, tunnels, wastewater, waterways