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Parshall flumes are a mainstay of flow measuring throughout wastewater treatment plants (WWTPs).  

They can be found:

  • Measuring influent flows at the Headworks of the WWTP
    • Usually downstream of Grit Separation
  • Discharge out of the Primary Clarifiers to Secondary Clarifiers
  • Measuring Returned Activated Sludge (RAS) from Secondary Clarifiers back to Primary Clarifiers
  • Downstream of a Chlorine Contact Chamber or UV Disinfection System measuring treated effluent

typical process diagram for a wastewater treatment plant showing some locations parshall flumes can be used at

Upstream of the WWTP, Parshall flumes can be used throughout the collection system measuring trunk flows and the industrial pre-treatment discharges