Challenges Designing Wet Services for Pukeahu National War Memorial Park

The Pukeahu National War Memorial Park was constructed as the Government’s major project to commemorate the centenary of the First World War. In order to build the park, construction of an underpass (the Arras Tunnel) was required to accommodate State Highway 1 (SH1). The Arras Tunnel now carries SH1 traffic west, passing under the Park. This project was completed on budget and ahead of time by the Memorial Park Alliance (the Alliance) driven by effective collaboration between the Alliance (comprising client, contractor and designers) and key stakeholders. This paper outlines some of the challenges, design solutions, and working methods that were important to the success of the wet services design. The key threads that are covered in this paper include:

• Managing a tight urban site with complex and multiple services
• Protection measures for the Tory Street heritage sewer
• Developing a solution for the stormwater overland flows from surrounding streets that enter the tunnel
• Application of sustainable urban drainage approaches for stormwater management in the park
• Resilience of wet services for the Home of Compassion Crèche during a seismic event
• Considering safety in design for