Land drain pipe

[jc69817]

Hi guys hopefully just a quick question for you seasoned gardeners.
I have quite a small back lawn which drains really badly. I'm going to install a couple of runs of land drain pipe down the length and into a manhole.Having checked the net I see I should lay it surrounded by stone. Is the stone necessary or can I just backfill with soil.
Many thanks guys

 

[lostinthelight]

Is there higher ground above the lawn ?
litl

 

[jc69817]

Yes pal there is abit.

 

[lostinthelight]

If logistics allow I would start by digging a trench between the high ground and your lawn and from there to the drain. lay your pipe,back fill with stone with a permeable membrane to keep the soil out so it intercepts any runoff from above.Do you have any pics?
litl

 

[jc69817]

Sorry no pics too thick to put them on here lol
Yes I understand allthe digging and wrapping etc but as the lawn is less than 4mX3m so was wondering if the gravel was necessary
Thanks for your help

 

[lostinthelight]

If the soil is not free draining then its more difficult for the water to get to the pipe and there is more chance of the perforations in the pipe clogging without the stone. As you say,its not a large area so not much more effort to do it right?

litl

 

[jc69817]

Yeah I guess your right. No point cutting corners for the sake of a few quid.
Thanks for your advice

 

[r896neo]

The gravel is the most important bit. The gravel provides a free draining channel for water to filter down into and then its collected by the pipe. Without the gravel it is not a land-drain its just a buried pipe. Use large stone, ideally 40mm clean if you can get it. If not then 20mm will do