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I have a low spot in the back of my yard that pools excessive water after a rain. The only lower spot than that is my neighbor's yard (there is a brief upslope between my yard and his) so I cannot drain there. The back of my yard faces a sidewalk which is actually higher than the low spot by nearly 6 inches. The problem is the yards in this development were not properly graded. How do I drain this water? I don't think the classic French drain answer will work as all areas of the yard slope to this one spot, and I can't drain against the grade.

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6 Answers 6

All you need is a spade and a large plastic bucket like you buy drywall or paint in.

This is a variation on a french drain and will not provide relief against the "one in a hundred year storm" but should work for most normal rainfalls.

  • get a clean bucket of about twelve inch (thirty centimeter) diameter
  • remove the bottom
  • mark and remove the top six inches of grass as a single unit the diameter of the bucket
  • dig a hole the height of the bucket plus six to eight inches ( fifteen centimeters)
  • place the bucket in the hole and fill to the top with large diameter rocks( pea stone gravel in size of 5/8" or 7/8' or larger)
  • place a layer or two of good quality landscape fabric or geotextile on top of the bucket so earth cannot fill the bucket
  • replace the plug of sod you removed back in the hole
  • tamp and water
  • job done!
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Basically what you said but depending on the volume of water a larger container may be necessary. What you're describing is a dry well. There are some available for purchase. –  OrganicLawnDIY Jun 23 at 17:08

One other option would be to work with what you have, rather than trying to drain the water away.

You could put in a tree or a bed of plants that can tolerate having wet feet after a rain. They will absorb the water faster than your turf could. I don't know where you live and what plants would be appropriate for your location, but birch, dogwood and iris are all examples of plants that could handle occasional standing water.

I've also seen people put a pond in a spot like that. You would need to make sure you sized the pond properly to accommodate the volume of water you typically get after a rain, and you'd also have to design the edge of the pond to allow the rain water to drain into it.

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I was going to suggest this too. Here's a brochure from my city on how to build a rain garden. –  Niall C. Jun 23 at 16:44

It's really hard to say without knowing how much rain you get and the actual topology but dry wells and rain gardens are generally two good approaches to deal with this particular problem. A dry well is good if you don't want to fill up the space with plants. You'll just have a little drain in the lawn.

Another thing to consider is why is the water running off and is there something you can do to keep it where it lands. Is your soil compacted or does it have poor water absorbing capacity? There's info here on how to do a percolation test to see how quickly your soil absorbs water. Also a video here https://www.youtube.com/watch?v=e6VV6OU3ssA

If your soil doesn't absorb or retain enough water I would recommend doing a very heavy aeration (about 20 holes per sq ft) then topdressing with good compost in the fall. It's a good time to overseed then too. It should help retain some of the rain so that there is less runoff.

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Of course you can drain against the grade w/ a submerged French drain. Mine is 6' down at the end of the run, and drains a whole acre just fine. leave the soil on top of the drain porous--i.e. mixed w/ sand-- and it works fine. a ditch or swale stays at the surface; a French drain works at any depth as long as the surface water can soak down to it.

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An idea of size and photos would be useful, but if the part that abutts the sidewalk isn't 50 yards long or more, I'd build in a small, raised brick wall, or concrete edging mortared together, a few inches above the level of the sidewalk, to keep the water off, if you're allowed to do that. I'm willing to bet that you're getting pooling there because of run off from the sidewalk surfacing, which is, as you say, 6 inches higher than your garden. This still leaves the fact that its the lowest point in your garden, and may still be pretty damp if all the rain ends up there eventually from surrounding soil. If it is, and the area's not too large, import topsoil and level off, or, as Michelle says, plant a willow, create a bog garden or make a pond.

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Some thought has to given to raising the grade near city property. Sometimes there is an unmarked easement or allowance. The city owns the property, you have to maintain it "as is". –  kevinsky Jun 23 at 17:32
    
@ Kevinsky Ah, I guessed, being the States, there'd probably be some ruling... –  Bamboo Jun 23 at 17:34
    
The problem is standing water. If you can't get the water off the property and you want to use your property for growing plants, a patio...you either have to make a pond, a wetland or figure how to get the water down into the water table. Standing water means breeding mosquitoes. A dry well can also look like a dry pond, stream. It'll get the water flowing again, look great, stop standing water and mosquitoes. It is inexpensive, you can easily do the work yourself. Send a picture of your property, a base plan. An 'as-built' you can find in your mortgage documents. A couple of elevations... –  stormy Jun 24 at 22:29

Standing water is always a concern, primarily for mosquitoes. A dry well would be the best solution if you have the space. All you have to do is dig a big hole where the water is draining to and fill with drainrock. It should be deep enough to get through any blocking soil/rock/clay layers. This gets the water away from plants and enough time to percolate back into the ground.

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Unclear why the downvote. Please explain. –  Paul Jun 24 at 12:51

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