GPR Scanning in Huntly

Huntly is an established Waikato town on both banks of the Waikato River, with a long history tied to coal mining and power generation. Much of the housing dates from the middle of last century, and some of the pipework serving it is of a similar age.

Town water and wastewater are managed by Waikato District Council, while the farms and lifestyle blocks spreading out from the town rely on bores, tanks and private lines. The river flats have high groundwater and soft ground, and the mining history in parts of the district means subsurface conditions are not always what you would expect.

Huntly is at the southern end of our regular run, reached via the expressway from Waiau Pa. We take on leak detection, service locating and installation work for property owners, contractors and businesses here, often on sites where no reliable plans exist.

Because Huntly's housing leans so heavily on the 1960s, 70s and early 80s, so does its pipe: asbestos-cement mains in the street and copper or galvanised laterals to the house. Galvanised chokes with rust and pinholes, so an old Huntly connection usually shows as weak pressure at the kitchen tap before it shows as a wet patch. AC mains are brittle, and the cracks we find are at joints where the soft river-flat ground has moved under them.

The pre-war streets near the river and the railway still carry original galvanised and some lead-jointed cast iron, which weeps at the joints. Dux Quest polybutylene turns up in the few late-1980s houses, and plastic is confined to the post-2013 infill. That mix suits an electromagnetic locator, because most of the old pipe is metal and traces from the toby, but the newer MDPE laterals carry no tracer wire and need radar or a hydro-vac pothole to confirm. On ex-mine land we also expect pipe that has been re-laid after settlement, with the old line left in the ground beside it.