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Monday October 06, 2008
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Guelph Permeameter
TheoryWhen a constant well height of water is established in a cored hole in the soil, a "bulb" of saturated soil with specific dimensions is rather quickly established. This "bulb" is very stable and its shape depends on the type of soil. Once the unique "bulb" shape is established the outflow of water from the well reaches a constant value which can be measured. The rate of this constant outflow of water, together with the diameter of the well, and height of the water in the well can be used to accurately determine the field saturated conductivity of the soil.Making a ReadingNever before has making a reading for hydraulic conductivity in the field been so easy. Easily assembled in the field from a portable kit, the unit requires only 2.5 litres of water to operate. An auger is provided to excavate a well at the desired location. After installing the Guelph Permeameter in the well, the first constant hydraulic head label is selected by adjusting the air inlet tube on the constant head device. By recording the rate of fall on the reservoir water scale, the steady state flow rate can be observed and noted. A second constant head level is then selected and the steady state flow rate recorded. The hydraulic conductivity, soil sorptivity, and soil matric flux potential can then be quickly calculated. The whole process takes half an hour to two hours, depending on soil type.© 2003-2008, ICT International |