Hi We're trying to temporarily close up an outdoor drain that backs up from time to time. We've already tried investigating the cause several times. The drain is actually just a 1ft deep squarish hole in the ground connected to a ~6" wide trench. The surrounding area is all tiled. For now, we'd like to close it up. I was thinking to cover it up with a piece of tile. Would it be a good idea to attach it with cement rather than adhesive, since adhesive would not be near water tight? I know cement isn't water tight either, so would it be a good idea to use some paint a coal of sealant on the cement? If it's a ok idea, does the cement need to be thick? Any thought appreciated.

I have a concrete patio in the backyard, and when it rains water runs across this patio, the past the back door and toward the driveway. If I replace this patio with a pavers, will I be creating drainage issues at the point where it becomes concrete again "downstream"? Drainage is already an issue in the back door area - which is why I'm considering a re-do in the first place. I need to address an improper slope in the concrete by the back door and therefore need to rip part of the concrete up... so I'm trying to figure out whether to just re-do just that one area in concrete or if some other material throughout for a bigger overhaul would be best. Please note we have a concrete slab foundation.