For the definition of HRU (Hydrological response units), the parameter slope can be classified into maximum of 5 classes. Depending on the definition the results will vary.
Is there a commonly used method to decide on the intervals of such classifications?
In literature, many different classifications are used. Most of the times, no information on how the classes were created is given.
How can I find out what makes sense the most?
0-7 7-15 15-20 20-25 25-30 30-100
In ArcGIS, the slope can be classified with different algorithms. For my watershed, the Natural Invertall (Jenks-Caspell-Algoritm) creates the classes
0-5 5-12 12-20 20-30 30-100
0-4 4-13 13-22 22-31 31-100