The IntErO model uses the Erosion Potential Method in its algorithm background [

13,

26]. The IntErO, an upgrading of the River Basins [

48,

51] and the Surface and Distance Measuring [

48] programs, is simple in handling and can be used to calculate a large number of data with the processing of 22 input parameters, returning, after the processing, 26 result parameters (Coefficient of the river basin form,

A; Coefficient of the watershed development,

m; Average river basin width,

B; (A)symmetry of the river basin,

a; Density of the river network of the basin,

G; Coefficient of the river basin tortuousness,

K; Average river basin altitude,

Hsr; Average elevation difference of the river basin,

D; Average river basin decline,

Isr; The height of the local erosion base of the river basin,

Hleb; Coefficient of the erosion energy of the river basin’s relief,

Er; Coefficient of the region’s permeability,

S1; Coefficient of the vegetation cover,

S2; Analytical presentation of the water retention in inflow,

W; Energetic potential of water flow during torrent rains, 2×

gDF^½; Maximal outflow from the river basin,

Qmax; Temperature coefficient of the region,

T; Coefficient of the river basin erosion, Z; Production of erosion material in the river basin,

Wyear; Coefficient of the deposit retention,

Ru; Real soil losses,

Gsp; Real soil losses per km

^{2}. The model considers six factors related to lithology (rocks permeability by percentage:

fp, permeable;

fpp, semipermeable;

fo, low permeability) and soil type (erodibility coefficient,

Y), topographic and relief data (

I coefficient), monthly mean and annual precipitation (

P coefficient), temperatures annual averages (

t coefficient), land cover data (

X coefficient), the state of erosion patterns, and development of the watercourse network (

$\Phi $ coefficient). The IntErO model can be characterized as semi-quantitative because it is based on a combination of descriptive and quantitative procedures. Compared to other semi-quantitative methods, this is the most quantitative because it uses descriptive evaluation for three parameters only: soil erodibility, soil protection, and the extent of erosion in the catchment. All other parameters are quantitative catchment descriptors. IntErO flowchart is presented in

Figure 2.

Isr represents the average mean basin slope of the studied area expressed as a percentage. This parameter is extracted from the Digital Terrain Model of the catchment (DTM-ASTER-GDEM) with a horizontal resolution of 30 m and a vertical resolution of 20 m (NASA earth data), while F is a watershed area in km^{2}.