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putriidx OP t1_jdt4b2y wrote

Reply to comment by Felipelocazo in How to fix this rock "trench" in my yard? by putriidx

Hey yeah let me try to explain!

So the trench here is simply rocks and a corrugate pipe, but the pipe is cut horizontally so it's basically just a "u" shaped pipe.

The rocks lead to that box drain and don't go into it unless there's enough force pushing it because 1. It pools at the beginning and 2. I think the trench may be lower than the box drain.

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Its_Curse t1_jdte6tz wrote

Seems simple enough to just lower the box drain then?

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MeateaW t1_jdtgx8b wrote

So, that U shaped pipe is supposed to be installed like an n instead of a u

That way; it has a big gap underneath that cannot fill with rocks (and sediment).

You put rocks underneath and rocks above and it becomes the french drain it was always meant to be!

As the water level rises above the bottom of the n shaped pipe, it flows into the pipe and hopefully down the hill toward the box drain.

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Felipelocazo t1_jdtjktl wrote

I would dig it all out 4” below the drain pipe and gravel, perforate the side of the box drain, then lay the clean concrete sand for those 4” including and envelope around the drain box. Then top the area that had the drain pipe with whatever you want, that is permeable, ie the gravel cleaned out. The sand will carry the water. This is all assuming the drain box goes somewhere with positive drainage.it wouldn’t hit to put sand below the box too, and poke holes in the bottom so there is no standing water.

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Felipelocazo t1_jdtjoun wrote

The trick is allow the materials to do the work, not necessarily a drain pipe. Although u could get 3” perforated drain pipe too.

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