If you are starting to have leaks in your basement, the problem may not be the amount of rain you are receiving, the problem may actually be your home. The foundation supporting your home may be the real problem. If your foundation is sinking or cracking, it isn't going to support your home properly, nor will it be able to protect your home from water or other issues. If you have a leak in the basement every time it rains, you should hire a foundation repair professional.