As part of a groundwater development project in 9 provinces of Indonesia,
Arcadis Euroconsult of
Arnhem The Netherlands set-up a Monitoring Unit within the provincial government
of East Java to undertake groundwater resource monitoring. In order to
work effectively a monitoring network of 100 observation wells was established
and a database was set-up. 30 observation wells were equipped with the
Tirtaharapan Pressure Logger which was set at a recording interval of 30
minutes.
The monitoring began mid 1997 and October 1998 the first data was collected.
All the processing and presentation of the data was performed with the
Tirtaharapan Logger Software and the results were stored in a database.
During the measuring period an earth quake took place on Java. The chart below shows the influence of the earth quake on the ground water levels in Surabaya. Note this is the raw unprocessed data.
Below you can see some of the processing steps. The water+air pressure is measured by a pressure logger and the air pressure is measured is by a logger. The air pressure is then subtracted from the water+air pressure so only the water pressure remains. The water pressure is measured in milli bar which is equal to centimeters of water pressure i.e. 1 mBar = 1 cm of water. When the water pressure is known a correction can be made for the elevation and water height can be converted to water depth. The processed data is then exported to an ascii file and imported into a database.
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