Case study - Discharge measurement at the river

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Courtesy of The OTT Hydromet Group

Due to the seasonally strong weed growth and low flow during low water periods the measurement of water level and flow at the measurement site 'Kleinraschuetz“ was rather distorted. It had to be corrected by putting in additional manpower for manual measurements.

Therefore it was decided to modernize the station completely and to install a stationary discharge measuring system. The challenge of the measurement situation was to find a solution that measures reliably at all water levels  from a low level of 29 cm to highest level with flood events at 310 cm.

Monitoring Solution

  • Measurement task: online measurement of velocity of flow and subsequent calculation of discharge per velocity – index method in water levels from 29 cm to 310 cm
  • Storage and management of all data for the Saxonian authority for environment, agriculture and geology (LfULG) with remote data transfer and remote maintenance of the measuring systems 

This was achieved by:

  • OTT SonicFlow travel time system (one-level cross path)
  • OTT SLD 2.0 MHz Side-Looking-Doppler-Sensor for measurement of local velocity of flow (index velocity)
  • OTT SE 200 shaft encoder water level sensor
  • Datalogger OTT LogoSens2 for monitoring and storing measured data, for discharge calculation and for  remote data transfer

The measurement profile was designed as double-trapeze and paved with stone. Two independently installed empty conduits DN 50 which are protected by a galvanized steel tube at the river bed (mainly during the pavement works) cross the water body. For easier access to the cables a cable duct has been installed.

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