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CP1 and CP15 Standpipe Piezometer

EXCELLENT LONG-TERM RELIABILITY

SIMPLE READINGS

VERY ECONOMICAL

The CP standpipe (or Casagrande) piezometer is used to measure pore-water pressure and water level in permeable soils in many geotechnical applications.

Description

The CP standpipe piezometer is a filter element that is attached to a riser pipe. When installed as a piezometer, the filter is located in a sand intake zone at the location where pore-water pressure is to be monitored. A bentonite pellet or chip seal is placed over the sand intake zone and the remaining borehole is backfilled with grout.

A monitoring well installation consists of a filter-element attached to a riser, backfilled with sand to within a few meters of the ground surface. A bentonite seal at the surface prevents runoff water flowing into the monitoring well.

The CP1 consists of a porous plastic filter inside a perforated rigid PVC body. The CP15 is a crush resistant porous plastic filter. Both piezometers are used with rigid PVC riser pipes.

Water enters the riser until the water pressure inside the filter equals the water pressure in the soil. A water level indicator can be then used to measure the depth of water.

The CP15 can be used in combination with the PWS piezometer if continuous monitoring is needed.

Specifications

PIEZOMETER TIPS

CP1

CP15

Type

Porous plastic

Porous plastic

Length

350 mm

300 mm, 600 mm

Diameter

33 mm

38 mm

Fitted adaptors

3/4 Sch 40 tubing optional

For rigid PVC standpipe  19 or 25 mm diameter model CP15

Filter

Plastic, ~50 μm, ~10 kPa low air entry 

STANDPIPE, FLEXIBLE TUBING & ACCESSORIES

Rigid PVC standpipe, 19 mm (3/4″) or 25 mm (1″) nominal diameter for CP15

Teflon tape for sealing threaded joints

PVC cement for bonding PVC pipe to filter

Silica sand

Pressure gauge for artesian conditions (uplift pressure measurement)

Cap: plain, slip-fit, vented

Ordering Info

Please specify:

  • Model
  • Length, diameter, adapters
  • Standpipe diameter
 

Optional accessories:

  • Rigid PVC standpipe, 19 mm (3/4″) or 25 mm (1″) nominal diameter for CP15
  • Teflon tape for sealing threaded joints
  • PVC cement for bonding PVC pipe to filter
  • Silica sand
  • Pressure gauge for artesian conditions (uplift pressure measurement)
  • Cap: plain, slip-fit, vented
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