A water flow meter is a key device used in various sectors of industry and municipal economy. Water flow meters allow for optimization of water consumption, process quality control and settlement with suppliers. Selection of the appropriate water flow meter depends on many factors, including required measurement accuracy or operating conditions. A different water flow meter should be used for gravity flow (partial pipe), water in pressure systems or for open channels.

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How much wastewater actually ends up in the sewer system, and how much is recorded "on paper"? Many manufacturing plants still base their billing on water consumption, even though the actual amount of wastewater discharged can vary significantly. In an era of rising treatment costs and increasingly stringent environmental requirements, this approach is no longer acceptable. More and more companies are seeking reliable methods for measuring wastewater flow in gravity sewers, because without reliable data, there is neither control nor cost optimization. In this article, we will answer the question of how to measure wastewater flow in pipes that are not fully filled.