Leak Detection in Drury

Drury is changing faster than almost anywhere else in the region. Land that was dairy pasture and lifestyle blocks a few years ago is now being cut into residential lots, with new roads, water and wastewater mains going in to serve them, and more stages following behind.

The ground is largely clay-based, which is firm to work in dry weather but holds water and gets heavy once wet. On greenfield sites the challenge is usually knowing where the brand-new services were actually laid, as as-built drawings do not always match what is in the ground.

Established parts of Drury and the surrounding rural roads still run on older pipework, and lifestyle properties often have long private water lines feeding houses, sheds and troughs. Watercare supplies the reticulated areas; many rural properties remain on bores or tank supply.

Drury has three kinds of pipe and they fail in three different ways. The old village has galvanised laterals and early asbestos-cement, which pinhole and crack at the joints. The lifestyle blocks from the 1980s and 90s run long alkathene lines from the road to houses and sheds, with Dux Quest polybutylene inside the houses of that era, and on those it is the fittings and the joiners that fail, usually under a race or a driveway where nobody wants to dig.

The new stages are PE100 and PVC with tracer wire, and that should make them easy to find and slow to leak. In practice a stage that was trenched, backfilled and landscaped by several contractors in quick succession leaves crushed laterals under retaining walls, tracer wire cut at the boundary and tobies buried under topsoil. Those are the leaks we chase on two-year-old houses in Drury. One more local wrinkle: the meters here are read and the public pipes maintained by Veolia under the old Papakura franchise, so the street-side plans can sit with Veolia rather than Watercare.