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.