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Are these artificial wetlands?

  • 16-02-2014 8:17pm
    #1
    Tefral
    Registered Users, Registered Users 2 Posts: 4,396 ✭✭✭


    Driving along the motorway and these are dotted along, all fenced off..

    My first thoughts are that they are artificial wetlands... am I correct or mistaken?

    Wetland1_zps198a6721.png


Comments

  • #2
    sawdoubters
    Banned (with Prison Access) Posts: 1,288 ✭✭✭sawdoubters


    are they built for water run off to get the water off the motorway to treat it

    https://www.engineersireland.ie/EngineersIreland/media/SiteMedia/groups/societies/water-enviro/AN-ANALYSIS-OF-A-CONSTRUCTED-WETLAND-FOR-TREATING-ROAD-RUNOFF-IN-IRELAND.pdf?ext=.pdf


  • #3
    Prenderb
    Registered Users, Registered Users 2 Posts: 1,560 ✭✭✭Prenderb


    Probably just attenuation ponds - filling up in times of wet weather and providing a reservoir for surface water collected off the road. The outlet from the pond restricts the outflow to the surrounding drain/stream/river to a rate it can handle (called the greenfield rate, based on the water runoff rate from the land before the road was built), hence the need for a reservoir as it backs up during rainfall. HTH!


  • #4
    hi5
    Registered Users, Registered Users 2 Posts: 3,107 ✭✭✭hi5


    A couple along the M9 seem to have been turned into wildlife sanctuaries, saw a goat in one of them. Nice to see ducks and swans on them though.


  • #5
    road_high
    Registered Users, Registered Users 2 Posts: 19,639 ✭✭✭✭road_high


    hi5 wrote: »
    A couple along the M9 seem to have been turned into wildlife sanctuaries, saw a goat in one of them. Nice to see ducks and swans on them though.

    Yea there's a few along the M9 between Castledermot and Kilcullen alright. Lord knows that stretch needs drainage in the wet, I'm always uneasy on it in the rain.


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