While heavy rainfull is good for agriculture, it can be very expensive for a home owner as a house is likely to be damaged due to the inflow of water . The problem is particularly accute if regular waterproofing has not been done. Over a period of time, the water accumulating on the roof of the house will seep into the walls of the house, and start dripping from the ceiling, making it difficult to live in the house and damage the furniture and other items kept in the house.
The walls of the house will become damp and it could cause structural damage to the house.
The problem is worst for homes with concealed wiring as the leaking water can cause a short circuit as water is a good conductor of electricity., Unlike homes where the wiring is open, for concealed wiring it remains difficult to find out where the short circuit is taking place, and an electrician who has the necessary tools to detect the short circuit will have to be hired.
Hence it is recommended that a house has a proper drainage system and the rainwater will immediately be drained from the roof of the house