Annotation: The problem of automating the determination of daily water consumption by continuously measured levels and discrete measurements of water flow using flow curves, which are the simplest characteristic of the capacity of the riverbed (and floodplain) and are widely used in river flow accounting and hydraulic calculations, is considered. Conclusions are made about the optimal analytical representation of the flow curve and the possibilities of constructing a universal model of hydrometric flow accounting.

Keywords: water flow, measured levels, flow curves, profiles, interpolation, approximation, model.