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Metering is essential to measuring water usage and managing water supplies. Most water meters around the world are small and primarily used to record domestic water consumption. Nevertheless, large meters remain key to both managing Resource and Demand. It is principally through the use of larger meters that we quantify how much water is being abstracted from underground aquifers, is used to provide the cooling water for all significant power plants or supplies our cities. Both small and large meters are thus essential for effective, economic and sustainable water management. However, unlike small meters which can be easily validated at little cost by placing on a traceable flow rig, there has been very little independent testing of large diameter meters due to the sheer size and cost of any calibration arrangements. This has led to a gap in our knowledge of the uncertainty performance of this key meter classification.
