I have a relatively flat concrete/flagstone patio. It's irregular shaped but I think it's around 1000 sq.ft. In the middle of the patio, there is a small drain grate. It never seemed to work very well, so I assumed that it was clogged.
I finally got around to getting it open and poking around inside. As far as I can tell, there's no there there. It's just a plastic grate, over a plastic square with a round hole 3" or so in diameter, and, below the hole, it's sandy/rocky soil all the way to China. Most importantly, there's no drainage pipe.
Is that an acceptable way to install a drain? Is there an easy way to route a drainage pipe there without breaking up the patio? It's about 15 ft. from the place where I could put the outlet. I have some experience routing thin 1/2" pipes by the means of a garden hose with water, but I'm not sure if that would work with a 2-3" drainage pipe.