Difference between revisions of "Hydraulic Conductivity - Amoozemeter"
Jump to navigation
Jump to search
Line 3: | Line 3: | ||
==Method:== | ==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 | + | 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:== | ==Equipment:== | ||
Line 11: | Line 11: | ||
* in-situ measurement, no analysis of disturbed soil samples in lab | * in-situ measurement, no analysis of disturbed soil samples in lab | ||
* measurement in different depths of soil profile | * measurement in different depths of soil profile | ||
+ | * easily transportable for measurements at any location | ||
+ | * less water consume | ||
==Disadvantages:== | ==Disadvantages:== | ||
* many pipes and valves - requires practice and understanding to recognise errors, set-up time | * many pipes and valves - requires practice and understanding to recognise errors, set-up time | ||
* price | * 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:== | ==What to watch out for:== |
Revision as of 12:44, 17 December 2008
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:
Other related web sites: