METODOLOGIA PARA AVALIAÇÃO DO ESCOAMENTO SUBSUPERFICIAL EM VERTENTES

METHODOLOGY FOR EVALUATING SUBSUPERFICIAL RUNOFF IN STRANDS

Abstract

The objective of this study was to create a methodological proposal to examine the subsurface flow dynamics of the waters in the slopes, considering that it can be applied in all types of climatic domain and the type of soil / cover, except in places where dominate snow or ice. For that, fieldwork and laboratory analyzes were performed and the main idea is to evaluate how much is drained superficially after a rainy event and how much is drained, how much it flows in the subsurface until the level of 100 cm and, finally, to predict how much is infiltrated to the water table. The experiment was executed in an area of ??16,657 m² located on the farm of the Goiás Federal University, Jataí Campus, Goiás State, Campus Goiás state. The strand has a slope of 3.7° with predominance of a Distroferric Dark Red Latosol with Franco-loamy texture. Measurements of surface runoff, collection of undisturbed soil samples, soil moisture assessments at depths of 30, 60 and 100 cm were determined during the experiment, as well as rainfall volumes were recorded across the experimental length. Out of the total rainfall that reached the surface, 20.444% was drained, 61.78% was stored in the soil, 17.77% was infiltrated into the water table, and 0.006% flowed into the subsurface.