I have a customer whos backyard is about a foot lower than the neighbors. He has an inground pool and that pool is pretty much level with the back of his house, I dont know how they did this without drainage. Anyway, whenever we get a heavy rain, it floods his pool, with the heavy storms we had this year, it has leaked behind the liner and into his house. I was thinking a stone drain all the way around the pool, 4inch corregated pipe wrapped in stone, approximately one foot deep, by a foot wide, and pipe it out to day light on either side. Or should i do a approximately one foot wall all the way around, to raise the level of the ground with the neighbors and do a drain all the way around? what do you think is the best solution. Once i get out of the yard, the yard drops off!