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Road Drainage - Impermable %

  • 27-06-2011 11:04am
    #1
    annfield1978
    Registered Users, Registered Users 2 Posts: 572 ✭✭✭


    For Road Drainage Design, has anyone seen if there is any guidance in the DMRB as to PIMP values for roads, verges, embankment slopes etc

    Does anyone use less than a 100% for road pavement?


Comments

  • #2
    godtabh
    Moderators, Science, Health & Environment Moderators Posts: 23,248 Mod ✭✭✭✭godtabh


    you can use less than 100% to take into account evaporation etc.

    the software you use can give you guidance on this


  • #3
    FesterBeatty
    Banned (with Prison Access) Posts: 406 ✭✭FesterBeatty


    annfield1978 wrote: »
    For Road Drainage Design, has anyone seen if there is any guidance in the DMRB as to PIMP values for roads, verges, embankment slopes etc

    Does anyone use less than a 100% for road pavement?

    Unless this is a 3am panic calculation on drainage that has already been installed..(every engineer knows what im talking about!!) i would take 100%.


  • #4
    Wavemechanic
    Registered Users, Registered Users 2 Posts: 6 ✭Wavemechanic


    FesterBeatty wrote: »
    Unless this is a 3am panic calculation on drainage that has already been installed..(every engineer knows what im talking about!!) i would take 100%.


    ...been there lots of times!!:D


  • #5
    Wavemechanic
    Registered Users, Registered Users 2 Posts: 6 ✭Wavemechanic


    FesterBeatty wrote: »
    Unless this is a 3am panic calculation on drainage that has already been installed..(every engineer knows what im talking about!!) i would take 100%.


    ...been there lots of times:D


  • #6
    FesterBeatty
    Banned (with Prison Access) Posts: 406 ✭✭FesterBeatty


    It's amazing what you can justify at that hour of the morning!!:D


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  • #7
    annfield1978
    Registered Users, Registered Users 2 Posts: 572 ✭✭✭annfield1978


    I've seen 90% used for roads for a D&B scheme i was briefly invloved with, but dont know the reason behind it, what standard gives typical values?

    for verges i have seen %s in the range of 50 - 70% which can make a difference overall

    any ideas on design standards ?


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