The purpose of this study was to obtain insight into the hydraulics of street inlets, through the variation of the discharge coefficient ( Cd) with the Reynolds number (R) and Froude number (F). It focuses on grate inlets with different configurations that were placed in reservoirs and channels, which correspond to ponding and gutter flow conditions, respectively. In addition, an orifice-oriented inlet was tested for single orifice, multiple orifices and orifices with roughness on the surrounding bed. The results summarize a complete variation of Cd that are applicable to the computations of the actual flows entering the inlet for different flow conditions. Depth computations near the inlets for flows in the channel were also a major concern. Therefore, three approaches were proposed in determining the head for the C d computations. Interesting results were obtained on the pattern of flow in the vicinity of the inlets.
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