The Guelph constant head permeameter is used to determines the permeability in the root zone for measurements to a depth of 15-75 centimetre. This is a complete set.
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 litres 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 80 centimetre attachments that can increase the working depth. The maximum practical working depth is 3.15 metre.
Accessories are available to expand the measuring possibilities of the permeameter. Measurements with the Guelph permeameter are meant for above the groundwater table.
|Guelph constant head permeameter|
|Depth Range, Standard Unit||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||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||137 x 15 x 18 cm|
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