I just moved into an apartment in nyc and I have a great 40 foot patio. Unfortunately the patio is on the other side of a large wall (I'm on one side of a hill) which drains into it. The drainage holes are at the bottom of the wall and because they're every few feet, the entire patio is usually pretty wet. I was looking for a cheap and easy way to divert the water along the side of the wall then directly to the drain. I am a renter though so obviously I dont want to do anything too expensive or irreversible (a little bit of drilling is fine though). I am attaching photos of the bottom of the section of the wall (the blue patterned thing is an outdoor rug). I welcome any help I can get.