You may find during the rainy season, water collects in the basement of your house. This in turn results in damping, destruction of the plaster of the exterior as well interior walls. In most cases dampening effects is seen inside the house which appear as a black mark in the look of the house. The only solution to all these problems is the waterproofing of your basement.
You are wondering how you can do it. Whenever you find any of the above stated problems during rainy season, contact a plumber who will tell you about the waterproofing. Make provisions for the rainy out to drain out of the basement rather being getting collected there. Also check if the drainage area has got blocked from debris and foreign particles. In this case also the rain water instead of getting drained will collect leading to damping.
Waterproofing of your basement should be done immediately as damping during rainy season can cause immense damage to foundation of your house.