A basement sump pump is something like an automobile airbag; hopefully you will not ever need it. If needed, though, either can be a life saver. There are both manual and automatic basement sump pumps. Battery operated models can be had for emergency use as well.
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Sump pumps are usually required to empty into a storm drain, not a sanitary sewer, to keep from overloading the sewer system. An alternative is a dry well. A dry well is sort of a reverse water well, in which the water runs in, and then gradually returns to the ground water table. No matter what your sump situation, you local professional plumber can be called upon to help. A qualified expert can advise you concerning the best sump pump installation for your home. Your plumber can then install your sump pump for safe, legal, and reliable operation.