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Message
French Drain Question
Posted on 2/5/25 at 8:31 am
Posted on 2/5/25 at 8:31 am
Hey Everyone,
I am planning a French drain system for my backyard to divert water toward the front of my house. I want to have a combination of a French drain system with perforated pipe and solid pipe that will collect the downspout water. My thoughts were to join the system together with the perforated pipe system tying into the solid pipe system down stream. At the transition point, maybe I dig a "dry well" that is deeper then the trench and fill with gravel to allow the water to wick through the rock and any residual water can go into the solid pipe?
I am hoping someone with experience with these would be able to tell me if this is a mistake, and if so, what recommendations could you give me.
See my plan that I drew up here. French Drain Plans
As always, the advice is greatly appreciated.
I am planning a French drain system for my backyard to divert water toward the front of my house. I want to have a combination of a French drain system with perforated pipe and solid pipe that will collect the downspout water. My thoughts were to join the system together with the perforated pipe system tying into the solid pipe system down stream. At the transition point, maybe I dig a "dry well" that is deeper then the trench and fill with gravel to allow the water to wick through the rock and any residual water can go into the solid pipe?
I am hoping someone with experience with these would be able to tell me if this is a mistake, and if so, what recommendations could you give me.
See my plan that I drew up here. French Drain Plans
As always, the advice is greatly appreciated.
Posted on 2/5/25 at 8:56 am to LSUTiger23
judging by the drawing you created, you are quite the detailed guy. very nice.
My $.02. And I am in the drainage business, but not an engineer (full disclosure).
Whatever size pipe you are planning to use....go the next size up. Sticks, leaves, crawfish pot stuff, etc. tend to get stuck over time.
Never use any 90 bends in drainage. use 45 degree bends, or wyes, or wyes + 45's. Main reason is that you will need to be able to make use of a clean out to flush the system on occasion.
I personally believe that the sumps you are planning are unnecessary. The perforated pipe french drain system should be enough. Water follows water.
My $.02. And I am in the drainage business, but not an engineer (full disclosure).
Whatever size pipe you are planning to use....go the next size up. Sticks, leaves, crawfish pot stuff, etc. tend to get stuck over time.
Never use any 90 bends in drainage. use 45 degree bends, or wyes, or wyes + 45's. Main reason is that you will need to be able to make use of a clean out to flush the system on occasion.
I personally believe that the sumps you are planning are unnecessary. The perforated pipe french drain system should be enough. Water follows water.
Posted on 2/5/25 at 8:56 am to LSUTiger23
I installed a smaller French drain in my yard a couple years ago and did a lot of research.
Don't see any issue with your design. Although in Louisiana soils a dry well may not be worth it.
Don't see any issue with your design. Although in Louisiana soils a dry well may not be worth it.
Posted on 2/5/25 at 8:58 am to Screaming Viking
quote:I used a catch basin box on my 90s that allowed me to clean them out when needed.
Never use any 90 bends in drainage
Posted on 2/5/25 at 9:17 am to Screaming Viking
quote:
I personally believe that the sumps you are planning are unnecessary.
When you say sumps, do you mean the # of Inlets/grates i am showing?
Posted on 2/5/25 at 9:43 am to crewdepoo
quote:
I used a catch basin box on my 90s that allowed me to clean them out when needed
This. Try to avoid blind tie ins. That’s where build up happens
Posted on 2/5/25 at 9:44 am to LSUTiger23
(no message)
This post was edited on 2/5/25 at 9:45 am
Posted on 2/5/25 at 10:36 am to crewdepoo
quote:
I used a catch basin box on my 90s that allowed me to clean them out when needed.
perfect solution. depending upon the depth of the pipe. you may have to install risers to attain the required depth.
Posted on 2/5/25 at 10:38 am to LSUTiger23
quote:
When you say sumps, do you mean the # of Inlets/grates i am showing?
no. i said sumps in describing what you called "dry wells". unless you have some serious ground water (IE the lowest lot anywhere around) then this is probably unnecessary.
Posted on 2/5/25 at 11:50 am to Screaming Viking
Let me echo your advice in sizing the pipes.
Never run 4” UG horiz. Lines should be a minimum of 6”
Never run 4” UG horiz. Lines should be a minimum of 6”
Posted on 2/6/25 at 11:40 am to LSUTiger23
I have 3 gutter downspouts emptying into catch basins then 6" solid pipe to a popup at the lower curb. There is an 18" drop over 40'. The contractor's alternative was to run downspouts directly into the solid pipe. I was worried about leaves and picked the catch basin option. I initially put a coarse filter in the basins, then switched to a diy cone of 1/8" hardware cloth. Five years along, and all is well.
Posted on 5/6/25 at 12:34 pm to Screaming Viking
Glad to find a relatively recent post on this topic. Ill be planning something very similar in the near future.
I have a similar design in mind to OP but without the dry wells (our yard isnt that large to justify it)
Question: For the endpoint of the pipe, what is the best way to let it drain toward the street. My yard has a sidewalk that intersects the direction of the pipe toward the street (obviously) so I imagine the pip would have to stop just before the sidewalk. My main question is, 'is that fine/normal to do?' Its probably a dumb obvious question but I just wanted to be sure. My yards slope isnt very significant so itll be a nice challenge to get the lions share of the pipe to be angled correctly but mainly I just didnt want to be getting cited if letting the pipe drain onto the sidewalk was against a vague code or anything.
Any advice is appreciated
I have a similar design in mind to OP but without the dry wells (our yard isnt that large to justify it)
Question: For the endpoint of the pipe, what is the best way to let it drain toward the street. My yard has a sidewalk that intersects the direction of the pipe toward the street (obviously) so I imagine the pip would have to stop just before the sidewalk. My main question is, 'is that fine/normal to do?' Its probably a dumb obvious question but I just wanted to be sure. My yards slope isnt very significant so itll be a nice challenge to get the lions share of the pipe to be angled correctly but mainly I just didnt want to be getting cited if letting the pipe drain onto the sidewalk was against a vague code or anything.
Any advice is appreciated

Posted on 5/6/25 at 1:12 pm to LSUTiger23
I didnt think I had enough drop at my road from my trouble spot at the front of my house, so I called a company, they said they could do it, put in the drain with like a 6inch perf pipe wrapped in some type of black fabric.......it sucks water out like crazy, best money I ever spent on my home. Good luck with your project.
Posted on 5/6/25 at 1:42 pm to LSUTiger23
I put in a french drain system at my house this weekend. Hell of a project. I was a cheapo and decided to not rent the ditch digger, big mistake
I put 2 square catch basins by my back patio and then sent that to the fence and then connected that to a low spot in my back yard with another catch basin.
The hard part was that the low spot in the corner was so low, that I had to leave the damn sticking up out of the yard so much, but I went back and tried to raise the area around it with the dirt that I dug up the trenches with. Hell of a project.

I put 2 square catch basins by my back patio and then sent that to the fence and then connected that to a low spot in my back yard with another catch basin.
The hard part was that the low spot in the corner was so low, that I had to leave the damn sticking up out of the yard so much, but I went back and tried to raise the area around it with the dirt that I dug up the trenches with. Hell of a project.
Posted on 5/6/25 at 1:43 pm to SundayFunday
quote:
what is the best way to let it drain toward the street.
I ran my pipe under my fence and used a Pop-Up emitter valve. Fingers crossed it works as it should.
Posted on 5/6/25 at 1:45 pm to SundayFunday
quote:
I imagine the pip would have to stop just before the sidewalk
If you're going to do all that work, I'd rather have the water drain to the street. You can easily tunnel under the sidewalk with a hose nozzle. Just dig a pit to the depth you need on either side of the sidewalk and let the hose/water pressure do the work. You'll be able to slide a section of pipe all the way to the street. I also sawcut the curb on mine so my pipe sits right at street level.
Posted on 5/6/25 at 1:58 pm to tigerfoot
Nice! Appreciate the advice from everyone.
Ill likely dig under the sidewalk if I can and just make it a whole weekend project sometime when we arent getting flooded and/or 100% humid summer weather.
Ill likely dig under the sidewalk if I can and just make it a whole weekend project sometime when we arent getting flooded and/or 100% humid summer weather.

Posted on 5/6/25 at 1:59 pm to Cage Fighter Trainee
I found some great youtube videos on this. I just didn't feel like doing that because I am pretty sure you need to notch out your curb as well correct?
Posted on 5/6/25 at 2:08 pm to jose

Yes. I made two cuts using one of these blades and chiseled the rest of the concrete to allow the pipe to fit. It may sound difficult but it's very easy, just wear safety glasses.
Posted on 5/6/25 at 2:22 pm to Cage Fighter Trainee
Ok good to know for if/when I decide to do all that. If the pop-up valve works, then I ride with that, but I know I can always come back and dig further and go under my sidewalk.
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