piezometer well

A standpipe well typically has a single filter zone at the bottom connected to a riser pipe open to the atmosphere, and you measure the water level directly. A Casagrande well—often built into the same borehole—uses a bentonite seal and sometimes a grout plug to isolate a specific layer more positively. Kingmach manufactures both styles and the choice usually hinges on whether the strata are uniform enough for a simple standpipe or layered enough to require zone isolation.

It matches the dominant particle size in the layer you plan to monitor. If your geotech lab has reported a D50 grain size, the filter opening should be roughly 10–20% smaller than that. For silty sands you might need a 40‑micron slot, while coarse sands may work with a 100‑micron opening. Kingmach keeps four common slot sizes in stock and can arrange for custom mesh if your borehole logs show an unusual gradation curve.

Angled installations are possible and fairly common in dam abutments or landslide monitoring. The filter section and riser still function as designed, but you’ll need to specify the angle during ordering so the seal assembly and centering spiders are configured correctly. Standard wells come arranged for vertical holes; any deviation from plumb requires a quick engineering check, but it’s not a special order problem formost angles up to about 30 degrees.

Most sites just need a periodic check that the surface cap is still watertight and the protection post hasn’t been struck by equipment. If readings start to look sluggish—meaning the water level doesn’t recover quickly after sampling—it may indicate silt accumulation on the filter. Gentle surging or flushing with clean water can restore the filter’s permeability in many cases. Kingmach supplies a simple flushing kit for the riser diameter you have, and you can do it with a hand pump or small compressor if the depth allows.

Yes. Many contractors ask for the well plus a vented pressure transducer and a small automatic datalogger so they can leave the site and gather hourly readings remotely. Kingmach can pre‑assemble the transducer on a hanger cable with the correct desiccant chamber, and the logger enclosure fits right onto the top of the standpipe. The logger comes pre‑programmed to your required sampling interval, though you will still need to visit the site to download data or add a telemetry module on your end.