Considering the environment by using thinned wood in the prefecture

Hiroshima Prefecture Regional Disaster Prevention Countermeasures Comprehensive Mountain Restoration Project (Valley / Mountainside Construction) (No.20)
* Embankment height (m): 4.0 * Approximate construction extension (m): 20 * Rockfall diameter (m): D = 1.8 * Converted fall height (m): H = 11.6 * Rockfall energy (kJ): E = 920