Flood damage can be caused due to many reasons and it is quite daunting when it does happen. Though stay calm and try and soak up / absorb as much of the water with towels and sheets as a first urgent action if its safe to do so. The most common causes of flooding on carpets and rugs is rain, when we have those large downfalls.  Then the next reason is a washing machine or bath overload.  This could be from an apartment above or alongside yours.