We had a very bad rain today and we found a very significant leak which we believe came from around the main PVC discharge pipe from our house. As you can see from the picture, when the house was built they put in two PVC pipes of different sizes. One for the main fresh water supply and one for the sewer discharge (the larger one). Then when it came time to finish out the house they fed the supply and drain through these existing pipes. It looks like water accumulated up against the foundation and then came in between the sewer pipe and the pipe placed as a placeholder. Is there any reason why I could NOT caulk around the existing supply and discharge to seal the space between the actual pipe and the pipe placed as a placeholder (I suspect there are proper names for this, I don't know). Thanks for any input you may have!