Geoprocessing applied in morphometric of the Ribeirão do Veado watershed - Piratininga (sp), seeking the conservation of the water resources

Abstract

The planning of the soil use has been turned out to be a very important activity in the agricultural and socioeconomic development, because the inadequate use and without planning of the lands it causes low yield of the crops. This work aimed the morphometric characterization of the Ribeirão do Veado watershed - Piratininga (SP), tributary of the Rio Batalha, seeking the planning of conservation practices of the soil in the area, through geoprocessing. The watershed with 1776ha, is located in the geographical coordinates 22^o 23' 32" to 22^o 26' 17" of latitude S and 49^o 06' 34" and 49^o 09' 45" of longitude W Gr. It was used as cartographic base the Map of Brazil (IBGE, 1973), in scale 1:50000. The dimension variables analyzed were: larger length (C), area (A) and perimeter (P) of the watershed and the for the relief were: medium altitude (Hm), altimetric width (Ha), medium steepness (H), form factor (Ff), relief reason (Rr) and drainage density (Dd), measured through the System of Geographical Information - Idrisi Java. The results showed that the medium steepness allowed classifying the relief as wavy, probably, due to the substratum that has high permeability with larger rain water infiltration and superficial drainage of the water, conserving the soil. The form factor (0.38) and the drainage density (1.66 km.km²) allowed to conclude that probably the watershed is not subject the flood, once the relief presents high influence on the hydrological factors. Therefore, the knowledge of the area hydrology and relief is of fundamental importance in the decision taking of planning actions and administration in the future preservation.