Land drainage calculation.

[Bob_A]

My proposed Indian Sandstone patio will be 59sq/m.
I was considering a linear drain connected to a herringbone network of perforated pipe to drain it.

Is there some way of calculating how much pipe will be needed.
Thanks

[lutonlagerlout]

why not just use a suds soalkaway bob?
there is a calculator on the soakaway section for working out cubic metres required for an area and think you would need about 1 M3 with the aquacell system,not sure with pipes though
LLL

[Bob_A]

Yes have considered the milk crates.
Was also considering this http://www.pavingexpert.com/drain14.htm
Tony mentioned the herringbones pipes when he did my random layout and that got me thinking, shortly afterwards I was speaking to my mate and has a 50m roll of 125mm perforated pipe that he'll give to me for free. That got me further interested.
The cells I'm guessing would cost 4x£75 ?

[flowjoe]

You will have to way up the tipping costs on both methods plus the cost of pipe bedding for the perforated pipes, there`s loads of cheap pipework around but tipping and aggregates do add up.

[Bob_A]

Good point!
Bit of a catch22 'cos I need to know how much perforated pipe I'd need so I can then do the sums on the tipping/aggregate.

[flowjoe]

Bob

I think there is a calculator on the site for the crates, if you then allow say 25mtrs of pipework and bedding (100mm pipe + 50mm surround) being equal to one cube of crates you wont be far off the mark.

You could then probably knock off 30% because you have more surface area to soak into on a herringbone system.

This is obviously dependant on ground type, pipe size and the amount of granular fill you use.



Edited By flowjoe on 1250192280

[Bob_A]

Thanks!

If there's room would it be possible to run the pipe in one continous length instead of herringbone.
Or is there some obvious reason that I've over looked.