tl/dr: I have a large sandy pit where I have to put the entrance for a yard/french drain. I can't remove the sand. I'll be building a deck on top of the sand pit, so I can't just "replace" it with grass to avoid erosion. So, how do I keep the sand from clogging my drain?
I'm dealing with some water that got into my (theoretically) water-proofed basement. After some experimentation, it looks like the bulk of the issue is that the previous owner flattened part of the yard for a pool, making it easy for water to reach the house before it runs off the (sloped) property.
He mentioned at closing that it took a ton and a half of sand to get the area flat enough for a pool. Sigh. Keeping water away doesn't require anything crazy - I created a small trench with a small berm near the house, and even in some heavy rains, the ground around the house has stayed dry.
So, now it is time to make this more permanent. My plan is to dig a deeper trench (although still not crazy deep - hopefully just 6-12 inches), and put a pretty standard french/yard drain to pull the water away downhill. The issue is that the main place the water collects, and therefore the "start" of the drain, is in a large sand pit. I'm worried it will be very easy for the sand to get in the drain and clog it regularly.
- It's a lot of sand. I don't want to try to remove it all. Way too much effort/cost
- I'm going to build a deck on top, so lawn/plant stabilization won't be a possibility.
I'm thinking I'll just end up putting some sort of tarp/landscape fabric down to cover the entire sand pit, build the drain on top, and then put the deck over everything. Is that reasonable?
The sand pit. For reference, the ground slopes down behind me in this picture. The neighbors yard in the background of the picture, as well as my own yard off to the left, flow towards the sand pit. This is the source of runoff that is causing me trouble.