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Old 09-12-2011, 05:40 PM   #1
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Drainage and an open grass area 30" below my backyard's level


Hello

I'm planning a landscaping of my backyard and I want to put in an area of grass in the middle that is 2.5' below the rest of the yard. I really like the look, and I think it will add dimension to the current flat layout.

Here's a link to the rough design:

http://i.imgur.com/Wrilc.png

The grass area is about 21' wide by 33' deep, covering (I'm guessing) around 500 sq ft.

What are the rules for drainage here? How does that all work, and what methods would I employ to make sure that this area does not become a pool when we get a big storm?

FYI - I live in San Jose, CA, and we get (typically) a mean annual rainfall of 14.4 inches. Our biggest storm in recorded history gave us just a bit more than 2 inches in one day (1995 according to NWS).

In a worst case scenario, let's say I get 2 inches every day for three days. That's about 250 cu ft.

If I dig a hole that's 8' x 8' x 4' (256 cu ft) and fill it with drainage rocks, then put the lawn over that, will it be enough for drainage? If not, why? (I understand that the rocks take up space, but I'm hoping that the water can drain out over time)

Thanks,

-----------------S

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Old 09-12-2011, 06:21 PM   #2
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Drainage and an open grass area 30" below my backyard's level


Just thing out loud here-----A sump pump could handle that much water and you never freeze there--

Might be a solution at a reasonable cost---I'm no landscape guy but I think it would work.

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Old 09-12-2011, 06:46 PM   #3
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Drainage and an open grass area 30" below my backyard's level


How would one go about placing a pump under a lawn? I mean without having a big plastic or wood trapdoor in the grass?

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Old 09-12-2011, 08:07 PM   #4
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Drainage and an open grass area 30" below my backyard's level


Lift up stairs---little pond--small wood landing at bottom of stairs---fake wind mill--(yuck)

I'll bet you can come up with a 2x2 cover somewhere.
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