Standpipe Piezometers
Water level readings are typically obtained with a water level indicator. Advantages of the Standpipe Piezometers include economical components, simple to read, and long-term reliability. They are used to monitor pore-water pressure to determine slope stability and to monitor seepage and groundwater movement.
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| STANDPIPE FILTER TIPS | ||
|---|---|---|
| Polyethylene Tip, 12″ (305 mm) | 51417402 | Standpipe filter tip is used with plastic riser pipe. Tip mates directly with 0.75″ slip coupling and is supplied with an adapter kit (51405150), which includes adapters for 0.5″ and 1″pipe |
| Polyethylene Tip, 24″ (610 mm) | 51417404 | |
| Porous Stone Tip, 12″ (305 mm) | 51405102 | |
| Porous Stone Tip, 24″ (610 mm) | 51405104 | |
| Optional Adapter to 1.25″ pipe | 50712521 | |
| Optional Adapter to 1.5″ pipe | 50712531 | |
| Filter Material | Polyethylene tip is made from hydrophilic polyethylene and has 60 micron pores. Porous stone filter is made from fused aluminum oxide (Norton Alundum) and has 68 micron pores | |
| Filter Size | Filter is 1.5″ diameter cylinder, 12 or 24 inches long | |
The standpipe piezometer, which consists of a filter tip and a riser pipe, is installed in a borehole. The zone around the filter tip is backfilled with sand and a bentonite seal is place above that to isolate the intake zone. The remainder of the borehole is backfilled with bentonite-cement grout. Pore water flows into the standpipe until a pressure equilibrium is reached. The water level in the pipe then represents the pore-water pressure in the soil around the intake zone. Readings are taken with a water level indicator.