re: Backyard drainage problems

Before we poured the patio we knew that the backyard would be at or near the same elevation as patio and we thought that we may have to install some sort of drainage worst case scenario. We didn't really have any other options if we wanted a patio though. Well the slab was finished with a grade a little steeper than I expected and water just puddles at the edge of the slab and yard. A drain is the only option I can think of without tearing up my entire back yard