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Question about DIY French Drain/Yard Drainage project
Posted on 4/30/20 at 1:39 pm
Posted on 4/30/20 at 1:39 pm
I have a low lying spot in my back yard that collects at the corner of two walls. I'm looking to install drainage. House is built way up so not in a situation where moisture should come up from below. It's about 35 feet for both lengths where the drainage tubes would be burriued. I know that I want to have a catch basin in the corner where the water collects. Questions:
1) Do I install a true French drain with gravel incasing the corrugated tubing?
2) Should I use pvc pipe instead?
3) I assume that the hole needs to be about 8 inches to a foot deep. How much gravel do need to build a proper drain if I have roughly 70 feet of tubing?
1) Do I install a true French drain with gravel incasing the corrugated tubing?
2) Should I use pvc pipe instead?
3) I assume that the hole needs to be about 8 inches to a foot deep. How much gravel do need to build a proper drain if I have roughly 70 feet of tubing?
This post was edited on 4/30/20 at 1:45 pm
5
Posted on 4/30/20 at 2:42 pm to tha mastablasta
1 and 2) the perforated pipe serves a big void in the rocks. Small stones alone won’t move much because they don’t have a ton of voids and big voids may get clogged easily so people put perforated pipe and it makes a big gap in the rocks to move a ton of water. If you aren’t interested in moving water through the rocks, you could just bury large diameter pvc and never have to deal with all the common clogging French drain problems
3) are you sure you need the gravel to move all of your water? If it is one catch basin and a pop up drain you may just be able to bury some pvc.
3) are you sure you need the gravel to move all of your water? If it is one catch basin and a pop up drain you may just be able to bury some pvc.
Posted on 4/30/20 at 2:42 pm to tha mastablasta
If all the water collects where you are putting the catch basin I would just do that and PVC. IF you have water standing along the route of the lines then a french drain could work. I would have at least 3" of rock all the way around the pipe. It will help convey water as well and not clog up the pores of your pipe.
Assuming you have 70 feet and a 4" drain pipe you will need about 24 cubic feet of rock.
Assuming you have 70 feet and a 4" drain pipe you will need about 24 cubic feet of rock.
Posted on 4/30/20 at 2:44 pm to tha mastablasta
If you are installing a catch basin, I'm not sure why you are looking for a french drain unless you like the aesthetics of it? If you are simply looking to move water out, bury PVC pipe with it connected to your catch basin on one end and a pop up emitter on the other. Cheaper option and you won't have a bunch of rocks in your yard that you don't need.
Posted on 4/30/20 at 3:40 pm to tha mastablasta
As recommended by others go with PVC drainage pipe. It’s not expensive at all, particularly 4 inch pipe. I’ve done corrugated pipe drainage in the past, had to eventually dig it up when it clogged, and replace it with PVC.
If you do it right with appropriate catch basin(s) you won’t need gravel back fill. Just put back the soil you removed when covering the pipe. It will settle over time leaving a slight depression where the pipe is buried and you can later come back in a year or so and fill the depression with sand if you want.
Just make sure your drainage pipe is sloped properly to where you want the water to go. I seem to recall, a 1/2 bubble using a 4 ft level provides sufficient slope.
If you do it right with appropriate catch basin(s) you won’t need gravel back fill. Just put back the soil you removed when covering the pipe. It will settle over time leaving a slight depression where the pipe is buried and you can later come back in a year or so and fill the depression with sand if you want.
Just make sure your drainage pipe is sloped properly to where you want the water to go. I seem to recall, a 1/2 bubble using a 4 ft level provides sufficient slope.
Posted on 4/30/20 at 8:42 pm to CrawDude
quote:
Just make sure your drainage pipe is sloped properly to where you want the water to go. I seem to recall, a 1/2 bubble using a 4 ft level provides sufficient slope.
Replying to have this in my recent posts. I will be doing this shortly as well.
Posted on 4/30/20 at 8:50 pm to tha mastablasta
all you need to be worrying about is an available discharge that is lower than your capture point. Everything else is window dressing
if the water freely flows downhill it will work no matter what you do
if the water freely flows downhill it will work no matter what you do
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