groundwater level in a nested piezo
groundwater level in a nested piezo
(OP)
I have a nested piezometer that is screened between 5-6 m ("shallow") and 10-11 m ("deep")
The water level is measured at 3.2 m in the shallow piezo and 3.4 m in the deep piezo.
The soil is silty clay down to 20 m.
Does this suggest that we have a hydrostatic porewater pressure profile (10kPa/m) from say 3.4 m? i.e. no perched water level. If it is hydrostatic, why would there be a slight difference in the water levels measured?
The water level is measured at 3.2 m in the shallow piezo and 3.4 m in the deep piezo.
The soil is silty clay down to 20 m.
Does this suggest that we have a hydrostatic porewater pressure profile (10kPa/m) from say 3.4 m? i.e. no perched water level. If it is hydrostatic, why would there be a slight difference in the water levels measured?
Doug Hole
Junior Geotechnical Engineer





RE: groundwater level in a nested piezo
RE: groundwater level in a nested piezo
I don't think you should be concerned with 0.2m of difference in head. If you factor in the variability in the VWP (each manufacture reports a tolerance) and inaccuracy in the depth of installation, the discrepancy essentially disappears. Otherwise, you may have a very slight upward vertical albeit negligible gradient.
RE: groundwater level in a nested piezo
f-d
ípapß gordo ainÆt no madre flaca!