ABSTRACT
The study of the infiltration of water in the soil is of great importance for the knowledge of soil water dynamics and for the elaboration of models to monitor the moisture in the soil. The objective of this paper was to study the behavior of infiltration in a soil classified as Non Calcic Brown, at the Experimental Station of the "Universidade Federal do Ceará", using a modified Holtan equation. The study consisted of determining of the maximum infiltration capacity, constant infiltration capacity and total porosity of the soil. The infiltration rates, as a function of soil moisture data, were also obtained to adjust equation i=if+(io-if)[(Θo-Θ)/ Θo]α. The following equation has been obtained: i=17,5+(1128,2-17,5)[(0,2437-Θ)/0,2437]1,4726, which may be used to predict the infiltration rate without considering the accumulated infiltration and the depth.
Key words:
infiltration; infiltration rate; infiltration equation