From Blere and Torong, Water-Level Data Helps Track Conditions in Rawa Pening, Semarang Regency

Water levels can change over time. To observe these changes consistently, river basin managers need measurements taken at the right locations, well-maintained equipment, and data that can be easily reviewed.
The need for such monitoring is part of ongoing efforts to observe conditions in the Rawa Pening area. According to a BBWS Pamali Juana activity report dated February 19, 2025, two automatic water level recorders (AWLR) were installed in Blere and Torong. One automatic water quality (AWQ) monitoring system was installed in Galeh. The PT Luwes Inovasi Mandiri team was involved in the series of activities alongside the contractor and BBWS.

Why is continuous monitoring important?
Occasional water-level readings only provide a snapshot of conditions at the time of measurement. AWLR systems allow water-level changes to be recorded continuously, giving field personnel a time series that can be used to review patterns of rising and falling water levels.
However, reliable water level monitoring does not begin only when the sensor is switched on. Installation location, foundation readiness, power supply, and equipment protection all influence whether measurements can be carried out properly. This is why the work in Blere and Torong began with field surveys.
On December 11, 2024, the team found that all three installation sites were not yet ready because some construction work had not been completed. Once the concrete foundations were available, the Blere AWLR was installed on December 13, followed by the Torong AWLR on December 18. Protective fencing was subsequently installed at both locations.

Water levels and water quality are monitored together
Monitoring in the Rawa Pening area also includes water quality. The AWQ system in Galeh was prepared to monitor BOD, COD, total nitrogen, and total phosphorus in water flowing into the area. The activity report states that the monitoring data are displayed through a dashboard.
Measurements of nitrogen and phosphorus help personnel review changes in nutrient concentrations in the water. These data need to be interpreted alongside other water-quality parameters and field conditions before being used to assess the causes of any changes. With AWLR and AWQ systems installed at different locations, managers gain observational data on both water levels and the quality of water entering the Rawa Pening area.
Installation of the Galeh AWQ system was carried out in stages. From December 14–17, 2024, the team installed the data-logging panel, solar panels, and piping used to collect water samples. Work continued from December 23–25 with the installation of sensors, batteries, and protective components for the sampling pipes.

Field inspections are an essential part of system reliability
A joint inspection involving representatives from BBWS, the consultant, and the contractor on December 26, 2024 resulted in several follow-up actions. The team added solar panels and batteries to the installed equipment. In Galeh, CCTV was installed to support physical monitoring of the monitoring station and its surrounding area. The pipeline running from the river to the monitoring station was also reinforced.
Calibration was the next stage. According to the report, reagent preparation for total nitrogen and total phosphorus measurements was carried out in the laboratory after the results of field preparation were considered unsatisfactory. The calibration process took place from January 19 to February 7, 2025. Testing and training attended by representatives of the BBWS hydrology unit and the contractor were conducted on February 18, 2025.

This series of activities demonstrates that a water-monitoring system requires more than simply installing equipment. Measurements must be supported by adequate field infrastructure, a reliable power supply, verification of results, and personnel who understand how to operate the system.
For PT Luwes Inovasi Mandiri, its involvement in the installations at Blere, Torong, and Galeh forms part of its work in delivering monitoring technology that can be effectively used in the field. For those responsible for managing Rawa Pening, the primary value of the system lies in the continuous availability of reliable, quality-controlled data that can support the evaluation of water conditions.

PT Luwes Inovasi Mandiri
Industrial IoT & Monitoring Solutions
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