Hydraulic Conductivity - Amoozemeter
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Parameter to be measured:
Hydraulic conductivity
Method:
Constant head permeameter: Measures infiltration rate within an auger hole up to a depth of 2m and with extension set up to a depth of 4 m. A constant hydraulic head is kept in the auger hole .
Equipment:
Advantages:
- in-situ measurement, no analysis of disturbed soil samples in lab
- measurement in different depths of soil profile
- easily transportable for measurements at any location
- less water consume
Disadvantages:
- many pipes and valves - requires practice and understanding to recognise errors, set-up time
- price
- exact geometry of auger hole as specified in the equation is not often realised
- measurment in depth up to 70 cm is complicate to control water level
What to watch out for:
potential problems with
- hydrophobic soils
- heterogenous water content of soil before measurement
- strong effects from preferential flowpaths
- strong swelling/shrinking of soil
- effects of impermeable layers before stationarity is achieved
- inclined, uneven surfaces
Problems/Questions:
Links
Projects that used the above equipment:
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