Smallholders Insurance from Greenlands

Author Topic: Broken land drainage pipes  (Read 417 times)


  • Joined Oct 2019
Broken land drainage pipes
« on: October 06, 2019, 07:40:41 pm »
Hi Everyone, Thanks for letting me join the forum.
We have  this year moved to mid Wales and we are enjoying the complexion enhancing moisture filled air.
Unfortunately the 2 acres of land we now own has some drainage issues, notably a culverted stream which passes under the house . Which is in a dip.
About 100 m from the house we have discovered when excavating at intervals, that the 18inch concrete pipe has collapsed. So the stream is moving through the pipe but is constricted.
I think it will be possible to replace the collapsed sections of concrete pipe with new 450mm twin wall plastic non perf land drain pipe. What do people think? How would I make a good sealed connection between the pipes if so?
Has anyone had this problem.
Unfortunately its now coming into winter so some water is always moving through the concrete culvert.


  • Joined Feb 2012
  • Somerset
Re: Broken land drainage pipes
« Reply #1 on: October 08, 2019, 09:07:37 am »
Welcome to TAS from a currently sunny Somerset (not sure how long the sun will last, mind). :wave:

I'm full of admiration for someone who is able to tackle such a task. I don't think I would be up to it. You may be able to find a more expert person if you post your query in the "Techniques and Skills" section. There are some very clever people who give advice there. :)

Mad Goatwoman of Madeley

  • Joined Sep 2011
  • Telford
Re: Broken land drainage pipes
« Reply #2 on: October 09, 2019, 01:05:10 am »
Hi and welcome to TAS.


  • Joined Dec 2011
  • Gascony, France
Re: Broken land drainage pipes
« Reply #3 on: October 09, 2019, 10:12:32 am »
Hi and welcome. That sounds like a lot of work- if sections have collapsed for no apparent reason, [size=78%]perhaps all of it may and could be it needs replacing entirely? As you say, it's a job for a dry Summer.[/size]


  • Joined Nov 2018
  • Carmarthenshire
Re: Broken land drainage pipes
« Reply #4 on: October 09, 2019, 01:38:23 pm »
How would I make a good sealed connection between the pipes if so?

Apart from it being hard work it should be a simple job.
If there aren't any proprietary concrete-plastic connectors....

1 - You could abut the plastic to the concrete as closely as possible and simply backfill around the pipes

2- If you want to do a better job of it...
       - Abut the two pipes.
       - Wrap some damp proof membrane (DPM), or other strong plastic sheet, around the join and secure with tape. About 6" either side of the join should do - wrap it tight. It is to prevent cement getting into the pipe.
       - Wrap some expanded metal lath (EML) around the join - not too tight. This is to hold the cement in place while you do the job and will act as reinforcement once the cement has set.
       - Use sharp sand (coarse is better than fine but either will do ). Make up a 2:1 or 3:1 mix of sand to cement and add a waterproof additive to the gauging water - this will make the mix more workable as well as waterproof. You may need as much as 1 to 2 25kg bags of sand per joint.
       - Starting at the bottom, have a 1"-2"  gap for the cement. Shove some cement in the bottom and push it in, jiggle it about with a stick or similar so it flows to fill the space. Then working upwards, build up the soil to within 1"-2" of the pipe and fill this with cement and jiggle. Keep going all the way round the pipe.
       - Cover with plastic to protect from rain and allow the cement to set.
       - Next day complete backfilling.

I hope this works for you. Have fun!


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