Fuel Depth : The average distance from the bottom of the litter layer to the top of the layer of fuel, usually the surface fuel. See also: Fuel Bed Depth
National Wildfire Coordinating Group (NWCG), Glossary of Wildland Fire Terminology, NWCG Program Management Unit, National Interagency Fire Center, Boise, ID, USA 2014. http://www.nwcg.gov/pms/pubs/glossary/pms205.pdf, (For Fr - Amer) {45}