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Guelph Constant Head Permeameter Case
Guelph Constant Head Permeameter
Guelph Constant Head Permeameter Case
Guelph Constant Head Permeameter

Guelph constant head permeameter


The Guelph constant head permeameter is used to determines the permeability in the root zone for measurements to a depth of 5.9 - 29.5 inch (15-75 centimeter). This is a complete set.

  • Steady stat principle for optimum accuracy 
  • Easily transported, assembled, and operated by one person
  • Measurements can be taken in 1/2 to 2 hours, depending on soil type
  • Many additional accessories to add



The Guelph permeameter is a constant head permeameter that operates in accordance with the principle of the “Mariotte bottle”. After making a borehole to the desired depth, the instrument is installed; the water slowly flows from the meter into the bore hole and will penetrate the soil. At a certain moment a saturated bulb is formed and the outflow of water from the permeameter reaches a constant value; this value is measured. Measurements can be taken in 1/2 to 2 hours, depending on soil type, and require only about 2.5 liter of water  

The bulb is very stable, and its shape depends on the type of soil, the radius of the well and the head of water in the well. The shape of the bulb is included in the value of the C-factor (Reynolds et al., Groundwater Monitoring Review 6:1:84-95, 1986) used in the calculations. The set is equipped with 31.4-inch (80-centimeter) attachments that can increase the working depth. The maximum practical working depth is 10.3 feet (3.15 meter).

Accessories are available to expand the measuring possibilities of the permeameter. Measurements with the Guelph permeameter are meant for above the groundwater table. 


  • Soil Permeability 
  • Environmental Monitoring 
  • Mining 
  • Soil Physics 

Set contains:

  • Guelph constant head permeameter  
  • Field tripod 
  • Augers 
  • Well brush 
  • Water container 
  • Vacuum test handpump, etc. 
  • In carrying case


Guelph constant head permeameter
Depth Range, Standard Unit 5.9 to 29.5 inch | 15 to 75 cm (note: with Extension Tubes, measuring depths can be increased)
Auger Cutting Diameter 6 cm (2-3/8 inches)
Well Height Range 0.98 to 9.84 inch | 2,5 cm to 25 cm
Hydraulic Conductivity Range 10-4 to 10-7 m/sec (10-2 to 10-5 cm/sec)
Collapsible Water container Capacity 11,36 liters
Maximum Permeameter Capacity 3,18 litres Combined Reservoir cross-sectional
Combined Reservoir cross-sectional area (X value) 35,22 cm2 (±0,18 cm2 standard deviation)
Inner Reservoir cross-sectional area (Y value) 0,16 cm2 (±0,04 cm2 standard deviation)
Package size 53.9 x 5.9 x 7.0 inch | 137 x 15 x 18 cm
Weight 46.3 lb | 21 kg
Kory Enneking

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