This is called hydrostatic pressure. It is cause by the heavy rains. When we experience heavy rains in a short period of time, the water cannot filter through the clay fast enough. This causes the water table (water level) to rise. If the water table rises above the level of your concrete floor slab, the pressure caused by the water will cause the water to push through all imperfections, in this scenario, the cove joint (where the concrete slab meets the concrete foundation wall). Concrete does not bond with other concrete. It has to be a continuous pour to create a seal. Unfortunately, the way homes are built, there are 3 different pours (for concrete foundations); 1st, they pour the footing, 2nd, they pour the foundations (or lay the brick for cinderblock foundations), and last they pour the concrete slab. Between the different pours is a micro gap (invisible, in many cases, to the naked eye). The only way to stop hydrostatic pressure from entering you home is to redirect the water with a drain tile system that is connected to a sump pit with a sump pump. The sump pump discharges the water away from you home (or business).