Which Type of Drainage pipes for lawn

zt-OctaviaN

Hi Folks,

I hope someone can point me in the right direction.
I very recently got 2 quotes for putting lawn drainage in the back garden.
quote 1 was €1,350 and quote 2 was €580 but he didnt know the price of the piping and said would I be able to get it myself.
Just to add both guys were dead pleasant to deal with and have been in the business for quite a number of years.

Now the first quote included a layer of material accross the top of the pipe to prevent silt dropping into the pipe he also included he would lay top soil over this and re seed, but the second guy said the plastic was not essential and would place the scraw back over the top of the pipe.


So, the first quote stated he would use the perforated flexible pipe you buy in rolls:
http://www.pavingexpert.com/images/drainage/landdrain_pipe.jpg

however the second guy reccomended to use 4 inch sewer type pipe and he would be cutting slots in it at the top about 3mm thick with a saw.
he even said you can buy it already perforated.

Has anyone heard that the flexible piping can have a tendency to clog up?

The second quote guy stated he wanted to give me the best quote and not try to be expensive from the outset and was open to any extra drain lengths if I wanted them in etc.

Any pointers would be much appreciated!
Thanks!
N

rayjdav

The 2nd cheaper guy does not have a bulls notion of what he is talking about. Not knowing the price of piping when submitted a quote for drainage is just stupid tbh.

If you want an area of land drained you use the correct stuff or dont do it at all. You would need proper flexi-perforated land drain piping with geo textile membrane over, otherwise silt will eventually permeate through the stone above and clog the holes. Basic really.

I assume they have allowed for connection to a sw drain or forming of new soakpit for run off?

zt-OctaviaN

Thanks Ray,

rayjdav wrote: »

The 2nd cheaper guy does not have a bulls notion of what he is talking about. Not knowing the price of piping when submitted a quote for drainage is just stupid tbh.

tbh I asked him for the quote in person 'on the spot' so i guess he didnt want to do himself out of a few quid and stressed he wanted to keep the price of the job as low as possible and thus stressed the flexibility of the number of trenches etc etc.

yes as found buy the first guy that there is a waven sewer type pipe running 1 metre into the lawn sloping in the direction of the drain! so no need for digging up the footpath!

So the yellow flexy is best as long as it is covered with geo textile membrane
http://www.pavingexpert.com/images/drainage/landdrain_pipe.jpg

Just a quick one,
Should the geo textile cover the top of the piping only or wrap it around?

i.e. should the geo textile surround the the piping between the pipe and the pea gravel or surround the pea gravel and pipe, sitting in between the earth and the pea gravel. Im thinking the second... litterally wrap the piping only.?

Thanks for your help,
N

rayjdav

Best method is dig your drain trench, sit the membrane into it neatly, put stone in (bedding), lay pipe, stone over, close over membrane, stone over and then sod. This is acually quicker method and same amount of stone used either way but gives complete cover to pipe/stone.

zt-OctaviaN

Ray youve been a great help! seriously much appreciate it!
ill discuss this with the guys that supplied the second quote and see if there will be much extra for the membrane.

Thanks again!
Nick.

AnthonyB

I've been pricing jobs like this too. I have a related problem though about planting trees, which I've posted separately.

Here's my pricing research. I've got a price of €70 for 50m of 100mm land drain pipe from the Co-op in Midleton, and €163.97 for 100m of 2m heavy duty membrane (it's weed blocker, but I think this will do) which includes delivery from groundforce in Britland. I think "804" stone which is a 2" size stone with dust in it can be had for around €10-12/tonne. Let's call it €210 for a load (20 tonne).

Based on other research, I saw one guy used 9 X 20 ton loads of stone to fill a 400-450mm covering of 1400m of drains. That means 13 ton for 100m of drains.

So - tho do 100m of drains, it would be €70 for the pipe, €164 for the membrane, plus €210 for a full load of stone (presuming we have to order a minimum of 20 tonnes though I don't know that for a fact; last time I ordered a half load though the price wasn't a whole lot less than the price for a full load). You might need some topsoil as well, but let's presume you're ok for that using the stuff you dig out.

That's a total of €444 for 100m of land drain. Plus labour / machine costs.