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Old 02-24-2018, 02:50 PM   #1
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Runoff area


So, I have been looking through all of the different french drain posts in here and trying to figure a few things out. I live in a subdivision in the middle of VA Beach where all of the back yards are connected. The yard drains terribly and I am going to install a few catch basins and some french drain to help drain it.

I was curious if there were other options for the run off besides taking it all the out to the sidewalk/street. I could dig a trench out that far, I just didn't want to if I didn't have to because I would be digging a trench through about 30-35 yards of my lawn that does not have any drainage issues.

Also, if I did the trench deep, and I come up to the side walk, how do I properly drain it the trench is so deep. I can't start to angle it up right? That would defeat the purpose. What are some good ending run off options for me?

Lastly, once that trench is dug, how do I ensure it is sloped correctly to drain? I am going to keep it simple and use gravel, some perforated pipe in the areas where water sits, and I will solid pipe in areas where water does not sit. I was going to gravel on top of it, then just put the soil back.

I know this is a repetitive topic, but I was not finding these particular answers in about 12 different threads that I read.

Thank you all in advance for the help.

-Zach
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Old 02-24-2018, 03:52 PM   #2
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Re: Runoff area


Catch basins aren't much good unless you have a way to drain the water away. You are correct that digging a trench that long with a consistent grade will be a lot of work. A laser and some interval reference points would work - perhaps the pros have better ideas.

If going with a trench, I would use perforated pipe throughout - it will help lower the water table. The sidewalk and discharging to the street is indeed a problem. There are no doubt bylaws dealing with that. You could also consider an outdoor sump pump (subject to freezing temperatures) but you will still have the problem of where to discharge to.

If your soil is reasonably porous you could look into a drywell - essentially a self draining sump, but I would imagine if your soil was porous you wouldn't be having the problem.
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Old 02-24-2018, 05:07 PM   #3
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Re: Runoff area


Quote:
So, I have been looking through all of the different french drain posts in here and trying to figure a few things out. I live in a subdivision in the middle of VA Beach where all of the back yards are connected. The yard drains terribly and I am going to install a few catch basins and some french drain to help drain it.

I was curious if there were other options for the run off besides taking it all the out to the sidewalk/street.
Ayuh,..... It All starts with an Elevation Survey,....
'n rememberin' water flows Downhill,....

A survey can be done with a simple handheld sight-level, but I'd want a laser level on-site to actually do the job,....

Ya gotta know how high, or low, the low point in the backyard is, to the street,....
If ya think it'll drain there,....
If it's uphill to the street, 'n ya go subterranean drainage, you'll probably have to tie in with the street's underground drainage system, if there is one,....

The Best answer whenever possible is surface drainage, usin' gentle swales,....
No maintenance, no parts, no blockages,...

A Topo map of the subdivision should reveal where yer backyard is Supposed to drain too,.....
It's possible a neighbor built a dam in yer drainage,....

Last edited by Bondo; 02-24-2018 at 05:13 PM.
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