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Errors|Flow measurement|Test equipment|Liquid-level measurement|Mathematical calculations|Equations|Accuracy|Hydrodynamics|Flow|Estimation|Liquid flow|Error analysis|Dimensions|Rate flowmeters|V-shape|Rivers|Calibration|Stilling wells|Water|Weirs (measurement)|Fluid dynamics|Flow coefficient|Formulae (mathematics)|Flow rates|Installation|Design|Field testing|Flowmeters|Hydrology|Channel flow|Width|Drowned flow