Rock characteristics          
  Rock dimensions (3x)  
  m                                
  Rock density     kg m-3  
  Rock shape     -  
 
  Slope characteristics          
  Mean gradient of the slope     º  
  Height of the cliff     m  
  Length of the forested slope (planimetric)     m  
  Length of non-forested slope (planimetric)     m  
 
  Forest characteristics          
  Mean stand density (DBH ≥ 10 cm)     ha-1  
  Basal area (DBH ≥ 10 cm)     m2/ha  
    OR          
  Mean diameter at breast height (DBH; ≥ 10 cm)              cm  
  Forest mix rate:        
  - Coniferous species     %  

 

 
  1. Current degree of forest protection: 1 - 100 %
 

  2. Required DBH distribution in the given protection forest:
 

 
 

  Required density with DBH ≥ 10 cm:   tr./ha; with DBH ≥ 20 cm:   tr./ha; with DBH ≥ 30 cm:   tr./ha; with DBH ≥ 50 cm:   tr./ha.
 

  - Ideal basal area (DBH ≥ 10 cm):  m2/ha
- Minimum stand basal area (DBH ≥ 10 cm):   at least m2/ha
- Basal area (DBH ≥ 10 cm) required to stop all falling rocks):  ??? m2/ha
 

  Data used for the calculation:

Rock volume = 0 m3
Rock mass = 0 kg
Maximum rock energy in the forest = 0 kJ
Length of the forested slope (measured along the slope) = m
Current stand basal area = 30 m2 ha-1