One of the most damaging effects of a disaster to your land is soil erosion. Under normal circumstances, roots help to stabilize soil, while stems and leaves slow water down, giving it time to absorb or soak into the soil. These protective functions can be severely compromised or even eliminated by fires. In the aftermath of a fire, the potential for flooding, debris flows, and erosion is greatly increased. Fortunately there are many things you can do to protect your home or business from these damaging effects.
Debris Flows a Post-Fire Hazard: http://landslides.usgs.gov/research/wildfire/