Strengthening water supply resilience for the NZDF

PDP was engaged by the New Zealand Defence Force to deliver the preliminary and detailed design for 5.2 km of potable water network renewals at a Central North Island site. The upgrade focused on replacing ageing infrastructure from the 1950s and improving network resilience, reliability, and operational flexibility.

Our team designed a range of new and renewed pipelines, including a deep gravity main between the water treatment plant and primary pump station, rising and delivery mains to storage reservoirs, and distribution network upgrades. The design incorporated monitoring systems, seismic shut-off measures, and new interconnections to support flexible network operation.

Given limited records of existing services, PDP developed a design approach that enabled close collaboration between contractor and engineer during construction, including service investigations and alignment verification. We also assessed risks associated with existing asbestos cement pipes, recommending a risk-based approach to retain them in situ, supported by an asbestos management plan and provisions for safe future removal.PDP undertook contaminated land, geotechnical, and planning assessments, and prepared design documentation, cost estimates, and tender packages. During construction, we provided technical support including oversight of network isolation, disinfection, and commissioning.

Working alongside NZDF, contractors, and stakeholders, PDP delivered a coordinated, practical solution that strengthens the site’s water supply network and supports its long-term operational needs.