The importance of being effluent accurate

1 January 1999, source Water & Wastewater Treatment

John Corris of Critical Flow Systems examines the flow measurement

Critical's datum refernce system.

Critical's datum refernce system.

Measurement at the outlet can be difficult during hogh river levels.
techniques used by sewage treatment works and demonstrates the importance of having an accurate flow measurement system at the point of discharge.


Around 6,500 sewage works discharge into the rivers of England and Wales and overall, the accuracy of their flow meters is uncertain. This unacceptable position is changing and the question now being posed is "how much and how accurate?"


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