Instructions:
  • Note that in the backwater curve the whole reach is under back water for both low and high flow.
  • Place the measurement location at the end of the reach for example at 1180 meter, i.e. changing from local downstream control to regional downstream control.
  • Press [Calculate Reach Characteristics].
  • Note that the back water curve for low and high flow differ and so are the reach characteristics, e.g. storage area for high flow is smaller than for low flow.
  • Press [Calculate Control Parameters].
  • Analyse the estimated waterdepths, flows and time interval to dampen out.
  • Change the control method from downstream control to upstream control.
  • Press [Calculate Reach Characteristics].
  • Note that the delay times are small and set to a minimum delay time equal to the sample time.
  • Note that the back water curves are exactely the same as they were for regional downstream control with the same measurement location.
  • Press [Calculate Control Parameters].
  • Note that the sign of the proportional gain Kp has become positive as the check-structure at the downstream side is controlling the water level now.
  • Note that in the estimated results the deviation from depth target is smaller and the time interval to dampen out has become shorter.
  • Change any parameter and analyse the result of this change.