The International Trade Fair of Machines and Devices for Water Supply and Sewage WOD-KAN took place on 20-22 May 2025. This is the 31st edition of the trade fair, which attracted many exhibitors and people who wanted to familiarize themselves with new devices and technologies dedicated to the water and sewage industry to Bydgoszcz.

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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.