In this research scour produced on the abutment's foot of the Sinsicap bridge due to the flow of Martho river, this estimation was made for different return periods, through a nonexperimental descriptive analysis for this reason a trip to the investigation zone was taken and was there where basic studies of engineering were developed. On one hand, one of these studies was the watershed topography, it was done with a 700-meters-upper-flow and 500-meters-downer-flow geometry and a 40-meters-width, also granulometry study of the riverbed, the left and rigth riverbank were done; on the other hand, metereologic datum of Sinsicap pluviometric station were downloaded from the SENAMHI website and with those the hydrological calculation of maximum rainfall and intensities was done, in addition to using engineering softwares (AutoCAD Civil 3D, Hidroesta, ArcGIS ang Google Earth) maximum flows for ...