Why You Should Not Connect Gutter Downspouts and Catch Basins on the Same Drainage Pipe
ฝัง
- เผยแพร่เมื่อ 24 ส.ค. 2023
- dallasdrainagepros.com
In this video we demonstrate a crucial aspect of a properly designed landscape drainage system. Very often, people will tie gutters into underground drain pipe, and then run that same pipe from the downspouts right through a catch basin or surface drain on its way to a discharge point further down the line. Systems get designed this way because it saves time and materials by using one pipe to handle both tasks.
The problem with this is that it doesn't work, especially in any kind of real storm. The back pressure created by a downspout is so intense that the water running into a catch basin will flow up and out before it even passes through, flooding the very area that was intended to be drained.
The proper way to design drainage in a scenario like this is with two independent lines: one for the downspouts, and one for the catch basins. The lines can eventually join, so long as the joint is downhill. Oftentimes, an easy way to do this is as simple as offsetting catch basins a foot or two from the mainline with a Y or a sanitary T connection.
Hope you enjoy, and don't make the same mistake we see all the time in landscape drainage systems!
This is crazy how your the only pro explaining this. This helps a lot and thank you, because I have the same layout as your doing and I couldn't find any other video how to do this.
That’s awesome - thank you!
Gate city also explains this also.
Great tip! There is some engineering in downspouts.
Yes indeed!
I’ve really been wanting to get into this trade and start my own business or work for someone to get some experience. I’ve done plumbing before so it definitely helps. I’m actually just right north of you in OKC and there’s hardly anyone that specializes in this trade around here so I think it’s a good time for me to start. I appreciate all these videos man because it’s really helping me and giving me confidence! How much does it take to get started typically and can I just get all my supplies at Home Depot or Lowe’s?
That’s great! Good for you - as long as you have a truck, your basic tools are shovels, a wheelbarrow, a level, and a saw for cutting the pipe. As you get into these jobs, you’ll find that you need things like a jackhammer (for when you come across rock) and other miscellaneous tools, but start simple and grow from there. I’d say for a couple grand you’ll be well on your way. As far as where to buy these things, most of it can come from Home Depot or Lowes, though you find better shovels from an irrigation supply store. Best of luck to you!
@@DallasDrainagePros I appreciate the response man! I’m looking to get my business going this summer!
Im SHOCKED that a drainage guy used a wye & 45 to make a combo instead of running san tees on their sides. (I saw the san tee there tho.
Great video. Thanks. I didn’t realize that. I was going to do that. So it’s ok for them to be connected on the same main line as long as they join the main line with a Y?
Can I have downspouts go straight down into a catch basin at a 90° angle, and cut a hole in the grate so it literally goes into it and the surrounding grate then helps prevent it from splashing out of the catch basin. The catch basin would also then be able to catch any standing water from really hard rains too. What do you think?
Thank you! To answer your question, that could work! You wouldn't necessarily need to cut a hole in the grate - that grate really just acts as a filter for leaves falling from the gutter. NDS actually makes a special grate just for such purpose: www.ndspro.com/12-inch-downspout-defender.html
Hope that helps!
Great information. Q. How far should you space clean out access on a 4" drainage pipe? Thanks for the upload
Spacing would depend on your hose length - a good hydro jet machine can reach 200 feet. Placement for a residential home is more about the layout of your drainage pipe - consider which lengths of pipe will not be accessible and add a cleanout. Hope that helps!
Makes a lot of sense about the back pressure but after watching a ton of videos on doing downspouts, the one thing I still trying wrap my head around is what about the debris? Is it because you're using PVC vs. corregated pipe/tube?
PVC systems flush debris much easier than corrugated systems. Design and ease of flow assists with this as well - think fewer sharp turns.
Would the system work if the pool guys took a little more time and cut in some wyes leading to their recievers?
Yes - that also would have worked - assuming the Ys were facing upstream!
It looks like the pool guys liked the center line you had already established. And they went CHEAP on materials.
Nice corrective steps you took, while keeping their inlets centered in the slab.
That pipe should be 4 inch anyway