History of the model

The model has been developed since the end of the 1980´s at the Department of Irrigation, Drainage and Land Scape Engineering, Faculty of Civil Engineering, Czech Technical University in Prague. The first version of the 1D model, designed in the FORTRAN programming language, was developed in 1989. It included processes influencing surface runoff and erosion. Two basically independent submodels: (i) submodel 1 used for the calculation of admissible slope length and designing of soil conservation measures, (ii) submodel 2 designed for the calculation of runoff characteristics in order to implement technical anti-erosion measures. Other versions of the model, launched particularly between 1996 and 2001, further developed operating systems. However, these versions did not considerably interfere with parameters and relations inside the model.

In 2011, based on laboratory rainfall simulation, a last version of the 1D model with SMODERP 10.01 designation was created. Compared to the previously introduced versions, a change related to runoff parameters in the kinematic wave equation depending on soil types in accordance with the Czech system of soil classification occurred. This system uses for the determination of basic soil types the content of particles up to 0.01 mm of the first size particle category (physical clay). The second modification was introduced by replacement of the current generation in slopes. Previously, the model functioned in particular sections of various lengths which had been initially defined as parts of the slope between two contour lines with identical vegetation and soil types. At the moment, the new model divides the aforesaid sections into individual elements of the same length and forms thus an interphase terminated by testing and comparison to the distributed 2D model.