Longterm monitoring in a drinking water facility

One of the most challenging tasks for continuous monitoring is the direct control of drinking water quality in order to warning immediately that permitted concentration values are exceeded. For the "Gallus Quelle" water supply with a fractured aquifer system, it is crucial to have continuous information on the water status.

The tool was mounted directly opposite an open fracture and the neutron density continuously recorded (Fig. 7). The monitoring curve corresponds with the simultanously measured conductivity values over the monitoring period of 14 days at 1 h data sampling intervals. With the help of water samples, the neutron response was calibrated (Fig. 8) and the Cl-concentration over the monitoring time calculated. The lowest values of 15.7 mg/l were found on November 4th, the highest ones of 20.6 mg/l on the 2nd (Fig. 7). The extremal values are not reflected in the conductivity curve. The neutron monitoring curve shows the situation in the water body in more detail compared with the conductivity curve; the small range in the Cl-concentration has little influence on the conductivity.

Figure 7. Monitoring a drinking water source conductivity values
Figure 8. Calibration of decay curves for the Gallus Quelle

Continue reading here: Pulse neutron monitoring on the River Meuse at Eijsden

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