Top-view into the laboratory © IWW  

Apparative equipment

Since January 2014, a new institute building with an adjacent hydraulics laboratory has been available to the Institute of Hydraulic Engineering and Water Resources Management. This provides extensive opportunities to conduct experiments and hydraulic engineering model tests. The modern laboratory with an area of 2,250 square metre offers the institute excellent opportunities to perform large-scale model tests.

The water circulation in the hydraulics laboratory consists of a 400 cubis metre underground tank below the laboratory floor, an elevated tank, which guarantees a constant water head of up to 7 m, and a DN400 ring pipeline below the hall floor. The capacity of the four pumps of the water circulation is 1,400 litre per secomd. The following large-scale equipment, among others, is accommodated in the hydraulics laboratory:

  • The large tilting flume (length 30 metre, width and heigth 1 metre, flow up to 400 litre per second, -2.0 to +5.0 percent angle)
  • The circular flume (diametre 3.25 metre; shear stress 0.9 Newton per square metre) 
  • The large concrete flume (length 30 metre, width and heigth 1.7 metre, flow up to 1,400 litre per second) 
  • The large concrete basin (length 27 metre, width 10.4 metre, heigth 1.2 metre, flow up to 1,000 litre per second) 
  • The dike model (length 20 metre, width 2.5 metre, heigth 3.0 metre, flow up to 900 litre per second)
  • The stepped flume (length 16.6 metre, width 0.5 metre, flow up to 120 litre per second) 
  • The cavitation channel 
  • The survey Boat Nelli2
  Ultrasonic sensor on dike model © IWW

Measurement equipment

Numerous high-resolution and modern measuring systems are available at the IWW, especially for water level positions, flow rates and flow velocities. In addition, all other relevant physical flow parameters such as pressure, temperature, concentrations and conductivity can automatically be recorded and evaluated electronically.

  • Ultrasonic probes for flow depth measurement with an accuracy of 0.1 millimetre and a measuring frequency of 25 Hertz
  • Several LDV (Laser Doppler Velocimeter) systems for the non-reactive measurement of one to three simultaneous velocity components in combination with computer-controlled traversing systems
  • 3D-ADV probes (Acoustic Doppler Velocimeter) with different measuring frequencies
  • Automatic detection of pressure discharges on ultrasonic basis
  • Several micro-measuring vanes with diameters < 20 millimetre for flow velocity measurement
  • Multiparameter probes for the measurement of water quality parameters
  • 360° panorama camera PointGrey "Ladybug 5" for creating image information for 3D-GIS applications
  • 3D printer for accurate replication of geometries and macro roughnesses