C7 Station
Tuesday 22 December 2009 by Wanda BEROLO

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C7 station location

Instrument specifications:

  • Acquisition mode:
- Piezometer HITEC CP5210 and thermometer in drilling
  • Measurement frequency: 10 minutes time lapse
  • Transfer mode: daily recovery by modem from the recording station
  • Representation: daily or hourly (averages)

Example of C7 station raw data and conversion formulas:

Date and time Recording Piezometry (mV) Temperature (°)
03/05/2009 02:40 5413 13,36 15,72
03/05/2009 02:50 5414 13,36 15,73
03/05/2009 03:00 5415 13,36 15,74
03/05/2009 03:10 5416 13,36 15,72
Piezometry data conversion: Data = (Piez_raw-4)*15/16-9.90125

Piezometry recordings:

C7 piezometer technical note

Piezometry data, compared to pluviometry, enable to show changes in water table levels due to rainfall. The fluctuation is caused by two distinct phenomena:

  • a general trend in water table discharge, well identified during the low water period (from June on the graph),
  • a recharge of the water table at each rainfall event, keeping the water level by the surface during the rainy period.

Temporal series, on the long term, will enable to constrain accurately the hydrological responses of the slope. One can notice that water level variations in the massif are significant over a few months period (nearby the surface during the wet season and more than 3 m deep during the dry season).

C7 piezometry and temperature data from November 2008 to October 2009. Comparison with rainfall over the landslide (start times of rainfall events in dashed lines)

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