Water quality monitoring at the "Klingenberg" dam in Saxony, DE

The Klingenberg dam is located in the Free State of Saxony and serves the drinking water supply of Dresden and large parts of the former Weißeritzkreis area. Besides, it contributes to flood protection and, to a small extent, to energy generation.

The sensors were installed at three sampling points (E1, E3, E6) in March 2019, using a multi-channel unit
(magnetic shut-off valves). This made it possible to monitor three water horizons (surface, middle and bottom
of the water body) at the dam with one probe. The monitoring of the horizons was carried out every hour.As part of regular sampling in an
interval between two and up to four weeks, both chemical and microbiological water quality parameters were determined in the laboratory. These measurements also served to verify the measured values recorded by the multiparameter probe:

• Oxygen concentration
• Oxygen saturation
• Turbidity
• Electrical conductivity
• Chlorophyll a
• Temperature

The multiparameter probe was used to monitor the raw water quality at three different withdrawal horizons of the Klingenberg drinking water reservoir over a period of one year. The measured values corresponded very well with the reference values of the laboratory. It is to be noted that the operation of the probe was absolutely lowmaintenance over the entire period.

Measurement results:

• Overall very good correspondence between laboratory and online measured values
• Slightly overestimated chlorophyll concentration by OTT probe, yet trends are correctly represented
• OTT probe proved stable and low maintenance operation
• No growth of coliform bacteria – yet the year 2019 can be used as "blank value" (comparison year without microbiological problems)

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