The concrete slab on my garage slopes away from the house and the gravel part of my driveway slopes down toward the house. The result? The end of the slab gets covered in gravel particles and dirt whenever we get a good rain/snow run-off and the end of the slab is always wet and dirty.
I'm thinking this collecting of water has contributed to the early demise of the slab. We are looking to replace it this summer and I would like to fix the water/dirt problem while I'm at it. I'm thinking of putting a trench drain at the end of the slab and running that into a tile line to drain down the hill. However, I'm concerned with the gravel and dirt being carried down into and clogging the tile line. The one I'm looking to tie into terminates into the gravel field behind a retaining wall which drains into another tile line. Any suggestions for handling this? I was thinking about running the drain into a catch basin before the tile line that I can take the lid off and clean out occasionally, but the ones I've seen at the store aren't very deep and I'm wondering if the volume of water necessary to carry gravel down the hill will just carry it right through the basin. And if I were to get one deep enough would I just end up with a mosquito breading ground instead.
Also how well do the plastic grates that the trench drains come with hold up to traffic?
Thoughts? Other options?