Innovation

Raw water source protection and Abstraction facilities

Raw water source protection and abstraction works are in principal exceptionally complicated given the fact that they are generally in areas which are very ecologically sensitive and in many case are already live sources for existing schemes. MEIC has used our experience to design out these problems before they materialise on site. 

A small sample of the raw water source works that MEIC Ltd have designed and constructed has been included below:

  • Menlough RGWS

    • Spring Source (3m Deep * 15m Wide * 10m Long)
    • Source Protection - Fully enclosed portal frame building to separate and protect a spring from a river, the spring also over flowed into the river
    • Foundations / Groundworks - Compacted stone column under ring beams formed the foundations, these columns allowed for ground water egress from the springs  
  • Gallagh RGWS Spring Source

    • Spring Source - (7m Deep * 17m Wide * 14m Long)
    • Source Protection - Fully enclosed portal frame building to separate and protect a spring from a river, the spring also over flowed into a collection chamber.
    • Foundations / Groundworks - Compacted stone column under ring beams formed the foundations, these columns allowed for ground water egress from the springs
  • Carnlasson Source (Roscommon)

    • Spring Source – (20m Deep * 17m Wide * 14m Long)
    • Source Protection – The ground conditions would not allow for the construction of a building, so a concrete encased pontoon was moored in the centre of the source and a flexible liner was then fixed into place off the pontoon and the source banks. A bridge was constructed to access the centre pontoon and to act as a pipe bridge to allow for the intake pipework be placed in the centre of the intake.   
  • Ogulla Source (Roscommon)

    • River Source
    • Source Protection – Refurbished an existing rural group water scheme source, with the addition of actuated valves, flow monitoring and testing instrumentation
  • Ballinagard (Roscommon)

    • Spring Source (12m Deep * 18m Wide * 30m Long)
    • Source Protection - Fully enclosed portal frame building to separate and protect a spring from surface water egress, the spring also over flowed into a stream.
    • Foundations / Groundworks – Steel cased CFA piles (steel cased to prevent concrete leaching into the raw water source) were used to support a continuous ground ring beam, this formed the foundations, these piles allowed for ground water egress from the springs, and ensured that the spring could be used for abstraction during the construction period.
  • Rathcarn (Roscommon)

    • Spring Source – (6m Deep * 8m Wide * 10m Long)
    • Source Protection – A structure with a 95% voids ratio was constructed within the spring, this structure had a liner placed on the upper surface and was buried with a stone fill. Inspection and abstraction chambers were constructed on top of this structure.
  • Peterswell (Galway)

    • Boreholes Sources – 6No (Existing wells which MEIC refurbished into full production wells)
    • Source Protection – A combination of insitu and precast concrete was used to form a water and vermin proof structure over the well heads
  • Barnaderg (Galway)

    • Boreholes Sources – 1No new production well drilled to 60m at 350mm diameter, fully lined and sealed.
    • Source Protection – A combination of insitu and precast concrete was used to form a water and vermin proof structure over the well head.
  • Lecarrow

    • Boreholes Sources – 2No new production wells drilled, fully lined and sealed.
    • Source Protection – A combination of insitu and precast concrete was used to form a water and vermin proof structure over the well head.
  • CBC

    • Boreholes Sources – 1No new production well drilled, fully lined and sealed.
    • Source Protection – A combination of insitu and precast concrete was used to form a water and vermin proof structure over the well head.
  • Clonbur (Within an SAC)

    • Lake Source – An existing intake pipe was refurbished to allow for abstraction
    • Source Protection – A precast concrete modular sump was constructed beside the existing structure and a valved cross connection installed, once the plant was decommissioned the existing works were decommissioned.
  • Burncourt WTP (2400m3/day)

    • River Source – A new concrete weir was constructed and an insitu concrete sump to allow the raw water to be abstracted via gravity from the new pond.  
    • Source Protection – A fully enclosed building was constructed over the sump to allow for instrumentation housing and for the maintenance of course and fine screens
    • Civil Engineering considerations – Temporary damming of the river, excavation in bed rock and construction within an ecologically sensitive area.
  • Fethard WTP (6900m3/day)

    • Anner River Source – An existing concrete weir was reused and an insitu concrete channels and dry well were constructed to allow the raw water to be abstracted via a 20 bar duty duty standby pump arrangement to a new WTP.   
    • Source Protection – A fully enclosed building was constructed over the sump to allow for instrumentation housing and for the maintenance of course and fine screen
    • Civil Engineering considerations – Temporary damming of the river, excavation in bed rock and construction within an ecologically sensitive area.

Three other upland small river abstraction points were also designed and constructed within this contract, using a similar method as outlined above.

Building information modeling (BIM)

MEIC is fully committed to the use of BIM for it's design and future operations management. BIM is becoming increasingy important in the water/wastewater sector and MEIC are at the forefront when it comes to this innovative capability.

FEATURES

  • 3D design capability
  • Clash detection
  • Design "walk-though", project sequencing, operations management

BENEFITS

  • Better designs through collaboration
  • Reduced safety risk
  • Faster project delivery
  • Improved whole life cost management
 
Building information modeling (BIM)
Building information modeling (BIM)

Off-Site Fabrication

MEIC has encorporated off-site fabrication/manufacturing methods into a number of project designs in order to reduce cost and schedule for our clients.

FEATURES

  • Pre-fabricated tanks
  • Portal-frame buildings
  • Packaged treatment plants
  • Substations

BENEFITS

  • Lower Capex, reduced construction time, less health & safety risk, increased quality
  • More sustainable (less waste, pollution, noise, on-site vehicle movement)
 
Off-Site Fabrication
Off-Site Fabrication

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