Plumbing gutter drains ???

WARRIORWELDING

WARRIORWELDING

Owner opperator Of WarriorWelding LLC.
Joined
Jan 6, 2008
Location
Chillin, Hwy 64 Mocksville NC
Ok I plan on tying all three 4 inch drains off my building together. 40 by 40 so collecting 800 sq feet of run off.
I'm running the length of the building plus another 30 feet. This is a cross the extra pad I had built for exspansion when I hit the lottery.
Both runs will dump into separate catch basins for storage and animal watering.
I am using solid 4 inch.

Question....how much drop in so many feet?

I plan on three tees for clean outs. Put them mid way between down spouts? Or close to each?

Pic for reference to building.
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I do close to each. In my experience most downspouts clog at the first elbow in the ground.

Those look to be smooth commercial gutter. Means pulling them apart to clean the first section of underground pipe will be labor intensive. Can probably bust up clog from clean out if it is close by though.

Nice building. Who built it.
 
YotaOnRocks said:
I do close to each. In my experience most downspouts clog at the first elbow in the ground.

Those look to be smooth commercial gutter. Means pulling them apart to clean the first section of underground pipe will be labor intensive. Can probably bust up clog from clean out if it is close by though.

Nice building. Who built it.
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Yes one piece commercial.
Its my commercial barn!!
Champion Buildings out of North Wilksboro.

Any idea of fall per feet???

Good news is very few tall trees near by. Bad news is none make any shade.
 
Not sure on fall per ft. I run gutters all the time into drains but a lanscape/other company always does all the piping. I can ask a few pros for you though.
 
Minimum 1/8" per foot. More better
 
moldman05 said:
Minimum 1/8" per foot. More better
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That matches the 1 inch in 8 feet I read earlier.

Thinking that a trencher rental is a good idea.
 
Do you have a skid steer? We used one with a trenching attachment to run a new water line 3ft deep earlier this year's at my bil's house. Was the bees knees
 
YotaOnRocks said:
Do you have a skid steer? We used one with a trenching attachment to run a new water line 3ft deep earlier this year's at my bil's house. Was the bees knees
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Negative. FIL does but not going that route.
 
You say solid 4" I would guess black corrugated pipe? Do yourself a favor and run in PVC. They even sell PVC thin wall drain pipe to save money but either way, it's so slick inside that it will not clog or build up with sediment like corrugated pipe. Also it lays flat in the trench, unlike corrugated.
Good luck on your project and nice building!
 
^^^Yeah pvc or nothing. I assumed pvc when he said solid.
 
Cleanout where it connects to the DS, 1/8"/ft min, solid PVC (bell end or regular, doesn't matter).

800SF should be fine in a 4" pipe per the NCPC, but if you can get more than 1/8", it'll have more capacity. Either way, I like to put a perf cap on the cleanout where the DS connects to the subgrade piping. It makes it easy to tell if there's a clog, and it gives the water somewhere to go if you get a real gully-washer.
 
R Q said:
You say solid 4" I would guess black corrugated pipe? Do yourself a favor and run in PVC. They even sell PVC thin wall drain pipe to save money but either way, it's so slick inside that it will not clog or build up with sediment like corrugated pipe. Also it lays flat in the trench, unlike corrugated.
Good luck on your project and nice building!
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YotaOnRocks said:
^^^Yeah pvc or nothing. I assumed pvc when he said solid.
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Yes pvc. Should have been real clear. Done had my fill of someone else's corrugated buried under another concrete slab. That stuff is for lazy crooked trenches and not much else.
 
I think you mean you'll be collecting 1600 sf worth of water.

If you're tying all the gutter spouts together I'd go with 6" or bigger. That's a lot of water in a heavy downpour.
 
awheelterd said:
I think you mean you'll be collecting 1600 sf worth of water.

If you're tying all the gutter spouts together I'd go with 6" or bigger. That's a lot of water in a heavy downpour.
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That would be the whole roof.
 
awheelterd said:
If you're tying all the gutter spouts together I'd go with 6" or bigger. That's a lot of water in a heavy downpour.
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A 4" lateral will accommodate 6" of rain/hour on 1,253 SF of roof area at 1/8"/ft slope. If you up it to 1/4"/ft, it'll do 1,766 SF.

I'm on the fence about whether a 4" or 6" line would be better. My gut says that a 6" line would be harder to clog, but I think a 4" line would flush itself out during moderate rain events. I know I've seen 18" dia storm lines that were half full of silt. <shrug>

I can say first-hand that I have about 800-1000sf going into some of our drains, and I've never seen any of them more than half full of water, and they've been good about flushing leaves. Most of the stuff gets caught at the downspout mouth on the gutter. Anything that gets into the pipe is flushed to the end of the pipe. Some of my laterals are 30-40ft long.

Oh, something else that hasn't been mentioned: spend the time to properly cement the pipe sections together, even with bell-end PVC. Roots will eventually find their way inside the pipe if you don't.
 
I also agree with pvc. Solid corrugated pipe will build up sediment in the valleys over time. With pvc, if you were to ever have a clog, it would be easier to snake it or run a jet through it.
 
Bottom one would definitely be my choice. The top one will make it hard to clean elbow from the downspout.
 
I wish I had pictures of the pipes from the goodwill I did in advance a couple years ago. Don't remember the dimensions of the roof but it wasn't very big. They used 12" pipe for the downspout.
Screenshot_2017-07-15-10-38-41.png
 
I think maybe a "wye" would be better as a clean out. Imagining having to use a long snake or hose to flush or clean out would be easier to push thru at an angle less than a 90 degree
 
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