I have experienced a leak in what has been an extremely dry basement (no pump, walkout, no aggravation of my allergies). We had basically a glacier (due to precipitation and borderline freezing temperatures) in our front yard which slopes toward the house. Water was not able to flow as it normally does. So it flowed down the brick sidewalk and pooled at the left side of the front door. Unfortunately, there is a crack in the foundation there which had been patched (inside)before we moved to the house 5 years ago. I don't remember seeing the crack from the outside (I went around patching anything that seemed to anything near a crack when we first moved in) but it is certainly there now and it let water into the basement. My neighbor suggested that when it warms up that I dig down and patch the crack from the outside (which is the entire height of the foundation). Question: Could this possibly be a serious structural problem which should be looked at professionally? If so, who or what kind?
Maybe, maybe not. It may have been there for quite awhile or it may have just occured. It could have been part of an original house settlement or poor construction. You should watch it closely for any sign of movement or if it will make you fill better you can hire a structural engineer to investigate it for you.