Implementation of the SCS-CN Model in the G.I.S. Environment

Brief description of the theme of the article and optional of the conclusions, in maximum ten rows. The hydrographic method of the SCS unit is used to transform precipitation into surface runoff. CN (Curve Number) represents a dimensionless index, with values between 0 and 100. CN depends on both the use of the land and the hydrological group of the soil and reflects the potential of water drainage on different lands. C.N values vary directly in proportion to the leakage potential and inversely proportional to the infiltration coefficient, having maximum values for soil class D or for urban areas, waterproofed. The paper presents a method of automatic calculation of the CN parameter using ArcGIS program.