Protecting and managing the waterways are of particular consequence in maintaining the balance between nature and human civilization. In this regard, river monitoring is one of the utmost issues in the field of river engineering due to (a) decision-making related to the protection of life and property from water-related hazards, such as floods, and (b) cost-effective management of freshwater that is safe and available for some applications, such as drinking, irrigation, energy, industry, recreation, and ecosystem health. Consequently, new technologies and methodologies are of particular importance to monitoring discharge rate considering various flow conditions at river gauges to improve the understanding of the surface hydrologic processes at the catchment scale (Tauro et al., 2014). Noncontact methods have been applied recently to measure flow properties, such as Doppler (velocity) radars (
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