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Stormwater Sewer Design

  • 04-02-2010 1:21pm
    #1
    Yossarian Lives
    Registered Users, Registered Users 2 Posts: 4 ✭


    I am looking for the guidance documents / best practice guides for the design of local authority stormwater sewers.

    I am looking at a problem for a colleague, a local authority is planning to divert their stormwater sewer through his property to alleviate problems upstream in the network.

    Obviously he's not too happy at the prospect of a large pipe running through his driveway, between his house and his garage, particularly as his garage has very obvious signs of subsidence arising from previous local authority works on this sewer.

    I have looked at part H of the Building Regs but they are more related to domestic systems. I am particularly interested to see if there are any minimum distances specified between a sewer and a residential dwelling.

    Thanks in advance for your assistance!


Comments

  • #2
    godtabh
    Moderators, Science, Health & Environment Moderators Posts: 23,243 Mod ✭✭✭✭godtabh


    Check out the Greater Dublin Strategic Drainage Study. Volume 2 in particular. Available on DCC’s website

    Minimum distance is usually 5 from nearest structure including foundation. This can bet bigger depending on depth of trench


  • #3
    aquascrotum
    Registered Users, Registered Users 2 Posts: 466 ✭✭aquascrotum


    Presumably the concern is w.r.t. structural performance of the pipeline rather than hydraulic performance, if his main objection is subsidence?

    GDSDS is generally to do with hydraulic performance and preventing flooding and increased runoff from developed sites etc.

    Sewers for Adoption (WRc) is the typical design standard including structural design; in NI we would refer to CESWI (Civil Engineering Specification for the Water Industry) as a typical specification.

    Unless theres no other option a main sewer under 300mm dia. shouldn't have an easement less than 5m to building founds - thats assuming shallow dig and good ground.


  • #4
    Robertd_07
    Registered Users, Registered Users 2 Posts: 179 ✭✭Robertd_07


    Yossarian Lives wrote: »
    his garage has very obvious signs of subsidence arising from previous local authority works on this sewer.
    Does the garage pre-date the sewer, or vice versa?
    If so, when they're going to undertake any further work, get them to surround & backfill in lean-mix concrete, might offer some degree of protection.
    As to general laying of pipes BS8301 would be a reference, (don't know the Eurocode number that'll replace it).


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