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Most of the tested flowmeters employ a pressure probe for determination of flow depth and a velocity probe for determination of flow velocity. These flowmeters are tested in a pipe with adjustable slope (I = 0 to 9 %). Actual discharge is measured with standard thin plate V-shaped weir (discharges up to 90 l/s), while the flow depth is determined with point gauges. Flowmeter’s results (data acquisition is perfomed by flowmeter software) are compared with actual discharges (i.e. values measured with V-notch weir).