2.1 Study Area
This work was carried out in the sections of Rio do Peixe watershed, located in Vera Cruz, Ocauçu and Marília cities, SP, Brazil, at coordinates S22° 14’52.68 ”, W49° 44’59.97”, start and end at coordinates S22° 18’13.28 ”, W50° 2’54.22”, Datum WGS 84 (Figure 1).
The climate of the region is humid subtropical, Cwa type according to the Köppen-Geiger classification, with temperatures above 29.7°C in the warmest month and below 10.6°C in the coldest month, , and average annual rainfall of 1,193 mm.
The predominant soils are: Red-Yellow Ultisol Abrupt, moderate horizon A, sandy/medium texture and Litolic Entisol, eutrophic (Santos et al., 2018). The geological formation consists of rocks from the Bauru Group, covered by neocenozoic sediments (Bezerra et al., 2009). The predominant relief is smooth undulating in the western plateau of São Paulo and in the depression; and strongly undulating in the escarpments (Itambé) that separate the plateau from the depression.