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The Estimation of Soil Water Infiltration Using CN Indices (Curve Number) and G.I.S. Techniques. The principal purpose of this paper is to establish a work methodology that can help to evaluate the quantity of soil infiltrated water in different pluviometrical conditions. Knowing this segment of rainfall-runoff system, could have an important role in anticipating a flood dimension. The beginning of surface runoff depends on the soil water saturation, and this depends, on its turn, on the antecedent precipitation characteristics as well as the soil physic characteristics (texture, structure, depth soil profile, permeability, capacity of soil infiltration and water retention etc.). Study algorithm provides the integration in G.I.S medium of an equation proposed by SCS (Soil Conservation Service) based on using Curve Number Index (CN). Determination of these indices it is realized, by USDA-SCS, depending on hydrological soil groups and land use. In the same time, these indices values depends on antecedent moisture conditions (AMC), determined by quantity of precipitation from last five days. The study surface is Săcuieu (Hent) Hydrographic Basin for which we intend, using G.I.S. functions, to represent infiltration values in space by emphasize the vulnerable areas to flood.

Key words: infiltration, Curve Number, G.I.S, Săcuieu