We had a flagstone patio put in 2 years ago and the landscaper assured me that the rain would drain towards the grassy area. That was not the case. The water when it rains puddles at the place where the original patio butts up against the flagstone. We get a nice little puddle that needs to be swept off after any rain. Do you have any ideas on how to fix this? Is there a way to place a drain in the lowest spot? Help I am getting tired of the problem.