A unidirectional flushing is a systematic cleaning of the aqueduct network piping by a series of sequential discharge operations making sure the water used for cleaning is always clean. The hydrants are used for the discharge and isolation valve closing insures a precise water orientation.

What are the advantages of unidirectional flushing?

  • Reduces the degradation of the hydraulic efficiency of the piping.

  • Improves water quality.

  • Reduces customer complaints due to rusted water.

  • Reduced water usage during flushing.

  • Gives a better knowledge of the aqueduct network configuration.


What is a unidirectional flushing program?

The unidirectional flushing program is a document that describes the steps to follow to perform a complete unidirectional flushing. This program gives a precise description of each operation to perform and their sequential order.

Each flushing sequence is presented on a file card that enables the technician to proceed with the flushing and gather data on the condition of the network components. The flushing sequences are designed to maximize the efficiency of the flushing and reduce the customer’s inconveniences.

The unidirectional flushing program simplifies the interventions of the maintenance personnel. By indicating the sequential order of the operations, it is possible to perform a complete flushing of an aqueduct system with a minimum of interventions on the system, therefore significantly reducing the costs and the water usage during the operation.

Why perform a unidirectional flushing?

All aqueduct network managers look for premium quality water. They can reach this goal with a good maintenance of their system and by a complete flushing of their water distribution lines in order to eliminate mineral and biological deposits. The flushing allows discharging any stagnant water from the water distribution lines and therefore increases water quality.

The systematic flushing of an aqueduct network is a demanding operation because of the complexity of the manoeuvres. A minor error in the sequence of intervention can jeopardize a whole section’s cleaning.

Even if the unidirectional flushing is not the solution to all water quality problems of an aqueduct network system, it certainly significantly reduces mineral and biological deposits on the interior perimeter of the water distribution lines. Therefore it reduces the hydraulic capacity loss of the water distribution lines.


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