雨水渗入土中。
当火毁坏了小山或大山的所有植被时，同样也损害了土壤中的有机物、阻止水渗入土壤。
When fires destroy all the vegetation on a hill or mountain, it can also weaken the organic material in the soil and prevent water from penetrating the soil.
地面被浸透以后，水流就无法渗入土壤中，而是开始迅速流入河流和小溪，这会造成水位上升继而引发暴洪。
When the ground become so saturated that water can no longer seep into the soil, it begins to run off quickly into rivers and streams and this causes a rise in water and a flash.
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