drainage advice needed
hi, i am in over my head with my home remodeling project and would appreciate any advice i can get. One of the major issues we have is that our neighbors house is built up much higher than my house. When it rains i get all of their runoff plus their gutters are aimed at my property. One side of my house from front to back fills up with water, several inches, and takes two to three days to dry out after a good storm. My contractor is suggesting we build a slab up most of the length of that side of my house, from front to back about 70ft long, 5 inches wide and 4 inches thick. Does anyone have any experience with a project like this? I am concerned that 4" is not thick enough and maybe we should be putting down a slab that is 10-12" thick. The ground is just so soggy, how do I ensure that the concrete stays secure?