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Installing Drainage Pipe for Lawn
It might be good to think about the trench grade. I don't know what an optimal grade might be but I think there are some issues.
I think that one issue is volume, and long runs pipe with little slope have lower flows even with a head on the intake end. I also think pipes that have shallow grades tend to be more prone to collecting sediment. Of course, steeper slopes means having to extend the pipe further down hill to get to daylight.
If the pipe drains a sizable area then there's going to be much more water at the outlet than from normal surface drainage and it would be good to think about surface drainage from the outlet. Permanent wet spots, erosion etc. are possible. If it's flex pipe then it's also good to ensure that the grade is constant so the entire pipe drains. I'm just raising issues and maybe somebody has the answers.
It might be good to shoot the trench floor to a specific slope, which can be a fun job in itself.
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Installing Drainage Pipe for Lawn
TomG; in my earlier post I talked about keeping the grade at 1% or greater. You are right the steeper the grade the more water a drain will carry. I guess I was speaking of field drainage tile. We live in an aeria where a non submerged outlet is almost a gift from above. We've ran (with a laser) as flat as 1/10th% grade to get an outlet out of a low areia, you're right it is slow to drain but it does work. When I was a kid (shortly after the Pilgrims landed) I worked part time for an Uncle who was installing the sewer hookup lines from from the main line in the street in our new town sewer system to homes around town. First day on the job he ran the hoe and guess who was in the trench with a pointed shovel and a four ft. level. He said "keep it on a half", I asked him what he was talking about, his reply was keep the level on half a bubble other wise it's too steep and will plug. I really never knew what degree of slope a half bubble is on a four ft. level, but so far I've never known of any I helped install giving trouble. Frank.
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Installing Drainage Pipe for Lawn
There's some flow rate info at the link below.
search with Google on: pipe area drain calculate
and you'll get a lot of info too.
bliz
Link:
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Installing Drainage Pipe for Lawn
Blizzard, great link. Thanks! ACZO, thanks for keeping me straight on perforated vs solid pipe. TomG and Hardwood - thanks for the additional info on slope. I will be working closely on the pitch and may not backfill over the pipe until I watch the flow during some storms. I have time to play with this. I like the 1/2 bubble on a four foot level rule of thumb. Nice and simple.
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Installing Drainage Pipe for Lawn
Sounds like the ideas here came together pretty well--room for both some work and a little research, which should make things interesting. I must be one of the last people in the world to use a water level and trig tables but it's fun (and doesn't need sight lines). Laser levels are sure getting inexpensive though. Somewhere I've seen a table that relates level bubbles to slopes but I can't remember where--half-bubble is simpler than trig tables though.
I tend to shoot my surface ditches to 3%, which seems to give good flow with little erosion but that may not be best for a pipe. Best angles for solid pipe likely are greater than for perforated pipe where you want water to hang around in the pipe. Yes, tiling for big fields would need to be near the Grand Canyon if appreciable slopes were used.
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Installing Drainage Pipe for Lawn
drainage ditches
I have a couple of drainage ditches that I would like to line with something.
Anybody have any ideas short of a concrete ditch?
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Installing Drainage Pipe for Lawn
ncrunch32...looked at your pics. Very nice looking property you have! What kinda psycho neighbor are you dealing with there? That is quite the deal with the anti-freeze jug. Nobody should have to put up with that...keep a stiff upper lip and good luck to ya 
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Installing Drainage Pipe for Lawn
Dieseltrctr, thanks for the compliment. My son has helped me complete staining the front of the house, and he and my daughter (with aid of the JD 4310) have helped me complete a stone wall in the back. So things are looking even nicer now. As for the neighbor - my wife and I are as tough as nails. So don't worry about us, my wife carries a Smith and Wesson.
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Gas Generator Weather Protecti
03-23-2004, 05:53 
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