1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

Help Please. New patio flooding

Discussion in 'In the Garden' started by hztm2008, 3 Jul 2021.

  1. hztm2008

    hztm2008

    Joined:
    19 Apr 2008
    Messages:
    103
    Thanks Received:
    1
    Location:
    London
    Country:
    United Kingdom
    Hello. Could I get some advice from professionals on here who install patios please. My friend had a new patio installed around a year ago. There was originally a concrete area that had a small drain located on the line with the grass and there was never any problems with surface water. The contractor installed a retaining wall using sleepers. raised the level of the lawn, increased the size of the concreate area and and laid paving slabs. He covered the original drain and put a long gully grill along the sleepers which appears to just run the water away to the far corner. As soon as it rains, the whole area floods as can be seen in the pictures. They asked the contractor if he could do something to put the original drain back in but he has said that he needs to install a french drainage system under the lawn and he will need to dig down 2 metres. My friends cannot understand what this would be for. It looks like the problem is rain falling on the patio area rather than rain falling on the grassed area. It looks like the water simply runs in the gully along to the side of the garden. They are thinking that they maybe need to get another contractor to lift the patio slabs and re-instate the original drain somehow? We would really appreciate any advice you could offer please. Thanks


    3.JPG 4.JPG 5.JPG Old patio area.jpg
     
  2. sxturbo

    sxturbo

    Joined:
    12 Jan 2014
    Messages:
    4,063
    Thanks Received:
    586
    Location:
    Essex
    Country:
    United Kingdom
    Get the landscaper back round to sort it.

    Was any DPM put behind the sleepers?

    The way the garden is now the grass will hold water above the patio level, whereas it didn't before, this may not help the situation.

    The drain obviously goes in the wrong direction, maybe the patio needs to come up and a soakaway installed then relayed
     
  3. Sponsored Links
  4. Alec_t

    Alec_t

    Joined:
    18 Mar 2017
    Messages:
    757
    Thanks Received:
    132
    Location:
    Wales
    Country:
    United Kingdom
    Why? If the gully doesn't feed into that then the water has nowhere to go easily.
     
  5. Notch7

    Notch7

    Joined:
    15 Sep 2017
    Messages:
    25,340
    Thanks Received:
    1,791
    Location:
    S. Uplands
    Country:
    United Kingdom
    So the sloping lawn was dug down to level and the new patio created is lower than the grass.

    I bet the aco drain goes nowhere....it's just for show.

    The solution is to dig a hole in the lawn, possibly 2 metres deep, install a proper soak away with aquacell crates, then run pipework from aco to it.

    Don't forget bottom of soakaway must be well below level of patio, not grass.

    That's assuming the soil is porous - do a porosity test. No point having a soakaway in heavy clay, that's just a storage tank.
     
  6. Sponsored Links
  7. sxturbo

    sxturbo

    Joined:
    12 Jan 2014
    Messages:
    4,063
    Thanks Received:
    586
    Location:
    Essex
    Country:
    United Kingdom
    It's the opposite way round by looks of things, the wall of sleepers built and then filled above ground level of patio.

    The patio being the lowest point is serving as the drain by looks of it.
     
Loading...

Share This Page