Mathematical model to determine the runoff coefficient based on precipitation and curve number data, in the Manabi hydrographic demarcation, Ecuador

During the last five decades, the forests and natural resources have been highly disrupted by human activities, causing a significant decrease of the plant coverage, consequently resulting in an increase runoff and soil erosion. Likewise, since 1989 non-basic information related to these topics has been obtained from the field, which does not allow appropriate hydraulic structure design. The purpose of the current paper is to determine the relation between the Curve Number CN and runoff coefficient C, from information of the 34 meteorological stations located in the Manabi Hydrographic Demarcation (MHD), during the period 1963-2013. This work is developed using information provided by several State institutions, and support of Geographic Information System. The information is processed using lineal correlation analysis to find an equation that relates the CN a C values.