The working principle and circuit design of the spot executive unit in computer telecontrol system for the production management of city water supply are described.

Composite water flow Calibration Facility that our unit designed, makes up of standard metal tank group, standard flow meter, water-supply system, pipeline system, control cabinet and diverter mainly.

At the meantime, it generalizes the water circulation into natural and human water circulation system using water supply and water consumption unit to simulate their structure factors.