Frédéric Berger, Luuk Dorren, Eric Mermin, Eric Maldonado
Cemagref Grenoble
2 rue de la Papeterie, BP 76
F-38402 Saint Martin d’Hères cedex

Rockfor.NET calculates the Probable Residual Rockfall Hazard (PRH) under a forested slope. PRH is the percentage of rocks that surpasses the forested area of a slope.

https://ecorisq.org/docs/szf_Berger&Dorren_157.pdf