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Meet John Duggan


Senior Engineer, Investigations, Potable Water.

Job description: 

Determine how to resolve issues that may affect Wellington’s water supply system.  Also manage the safety of the Macaskill Lakes and Karori Dams.

Work background: 

I have been involved in the design, construction, operation and planning of Wellington’s water supply system since 1980.

Favourite part of job: 

Seeing the successful commissioning of a new or upgraded part of the water supply system.

Least favourite part of job: 

Making presentations.

What I am working on now: 

Preparing project briefs for design and construction work to be carried out next year.  Reviewing reports and designs for upgrading the water supply system.  Revising the dam safety management system for the Macaskill Lakes.

A quick story about a job well done: 

Design and construction of a lowered spillway on the Wainuiomata Lower Dam, forming a small lake and wetland.

A (humorous) story about a job that went badly and what you learned: 

When commissioning a new pipeline a vacuum relief valve was left closed while draining the pipe. There was a loud bang and one of the pipes imploded. I learnt you should have a detailed commissioning plan and to check all valves before starting.


Chartered Professional Engineer, Member of Institute of Professional Engineers New Zealand.

Interests outside work: 

Family time, outdoor adventure sports (sea kayaking, cycle touring, mountain biking, tramping, mountain climbing, mountain running).

John Duggan is a Senior Engineer with Wellington Water. Image: Wellington Water.