Diver-NETZ Reduced operational costs by 97% - Case Study

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Courtesy of Van Essen Instruments

Near-real-time monitoring increased efficiency, reduced costs, and delivered critical insight into groundwater resources

Challenge
Reduce municipal groundwater monitoring costs, improve data quality, and achieve greater insight into groundwater resources.

Solution
Upgrade existing monitoring network with Diver-NETZ* wireless groundwater monitoring system that acquires, transmits and processes groundwater level and quality data in near real-time.

Results
Lowered operational costs by 97%, acquired nearly 60 times more data points, improved data quality and gained a better understanding of groundwater conditions.

New legislation called for increased groundwater monitoring in The Netherlands
In 2007, The Netherlands introduced the Municipal Water Act — legislation that requires municipalities to eliminate or minimize problems related to elevated groundwater levels, such as flooding, property damage, and unhealthy living conditions caused by damp environments. Better insight into phreatic groundwater levels is essential for municipalities to fulfill these new responsibilities and take appropriate measures to mitigate risks.

Located in the province of North Brabant, the Municipality of Heusden is home to approximately 43,000 residents. In 2008, about 100 phreatic monitoring wells began monitoring groundwater in the Heusden region to better align the municipality with the new regulations. Groundwater levels in the wells were recorded manually by field personnel every two weeks, using a water-level tape.

To minimize costs, the municipality wanted a new, more efficient data collection system. At the same time, it was also looking for ways to increase the quality and quantity of groundwater data to achieve a better understanding of the hydrological system. It was also necessary to have near-real-time access to water-level data so that the population could be notified as early as possible of emerging groundwater issues.

Municipality upgraded groundwater monitoring network with wireless system

In October 2013, the municipality chose to upgrade its existing groundwater monitoring network with the near real-time Diver-NETZ wireless groundwater monitoring system. Schlumberger Water Services renovated and upgraded a total of 108 monitoring wells and installed an additional four wells.

Each well was equipped with a Diver* groundwater datalogger which sampled and stored groundwater levels and temperature four times per day. A communication cables connected to each datalogger transferred the data to a Diver-DXT* radio device affixed to the top of the well. These radio devices transmitted data wirelessly to neighboring Diver-Gate* gateway devices, which automatically transferred the data field data to a centralized database via the GPRS cellular network.

As the data was received by the database, it was automatically validated and checked for various errors before it was made available to water authorities and, stakeholders via a secure web portal. Near real-time data collection allowed the municipality to quickly identify and mitigate hardware malfunctions and avoid data loss.

In addition, Schlumberger Water Services analyzed the collected water-level data and delivered quarterly reports containing key performance indicators and statistical analysis of water quality for each monitoring point.

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