Flow rate

 

  • First make a rough calculation of cross-sectional area in m2 i.e. width X average depth (you may need to make your own location specific calibrated depth pole)
  • Each team will have  different location topography and are thus asked to make a simple location specific tool, which allows recording of how long a float takes to travel 1m
  • If we assume the most common location is a bridge with e.g.a ~2m drop to water level, a simple L shaped device where the horizontal l section is 1m long will suffice
  • A float on a recovery line not impacted by wind can then be dropped in above the start of 1 the 1m course and its 1m journey timed
  • Repeat the test if possible in 3 areas of flow  but not near (within ~15% of total width) the banks. Take an average of the 3 readings to upload
  • The tool will calculate M3/s flow rate