Parameters  Formula  Description  References 
Linear parameter  
Hierarchical order (Strahler classification)  Fluvial hierarchy  Establishing the classification of a given body of water and the whole set of the watershed in which it is located.  [2] 
LrLength of the main river  Higherorder channel 
 [1] 
LtTotal length of all channels (km)  Sum of all channels of the basin 
 [1] 
Areal parameter  
ADrainage area (km^{2}) 
 Entire area drained by the set river system.  [7] 
PPerimeter (km) 
 Measure the twodimensional contour of the basin  [7] 
LBasin length (km) 
 Distance measured in a straight line between the mouth and the highest point located along the perimeter.  [7] 
KcCoefficient of compactness 
 The compactness coefficient (Kc) associated with the basin form is a circle, and the relationship between the perimeter of the basin and the circumference of a circle of area is equal to that of the basin.  [1] 
FBasin form 
 Relating to the form shape of a rectangle, corresponding to the ratio between the average length and the axial length of the form.  [7] 
DdDrainage density (km∙km^{−}^{2}) 
 The density of the drainage correlates the length of the flow channels with the watershed area.  [1] 
CmMaintaining Coefficient 
 This index is intended to provide the minimum area necessary for the maintenance of the onemeter flow channel.  [5] 
Relief parameter  
Altimetry amplitude (m) 
 Corresponds to the altimetric difference between the highest and lowest points along the basin.  [5] 
Interfluvial dimension (Horizontal dissection) 
 Distance between channels.  [50] 
Amplitude altimetry (Vertical dissection) 
 Drainage deepening of intensity.  [60] 
Altitude 



Slope 
 The slope is the angle of inclination of the local surface relative to the horizontal plane.  [51] 
Aspect 
 The slope variation of direction  [51] 