Attenuation

Attenuation

Attenuation refers to the temporary storage and then discharge of stormwater to avoid flooding. Rainwater is collected from properties where it feeds into a system that has been designed to collect excess rainwater for controlled release into stormwater drains. Excess water can be held over longer periods so the possibility of flooding in vulnerable downstream areas is therefore reduced or avoided.

Attenuation looks to bring about a reduction in the force of stormwater by carefully controlling the flow. The slow rate of discharge avoids downstream flooding and the erosion of waterways due to heavy flows.

Components needed for your complete attenuation system include silt trap or catchpit chamber as a prefilter, soakaway crates for stormwater storage, impermeable membrane with protection fleece (this can either come as individual components so that you can wrap the tank yourself or in two pieces as a pre-fabricated shoebox kit) and finally a flow control unit such as an orifice chamber. 

ATTENUATION

Utilising Attenuation as a SuDS technique

The Geocellular system is used to control, store and manage rainwater surface runoff. Its flexible nature means that attenuation tanks using geocellular modules are lightweight and easy to install. The system can be installed in both traffic and non-trafficked areas and is capable of providing high storage volume capacity and managing high flow events.

The Four Stages of Attenuation

  1. Attenuation Stage 1: 
    Stormwater flows into a silt trap (or catchpit) to catch debris, improve water quality & prevent blockages further in the system.
  2. Attenuation Stage 2:
    The filtered stormwater enters the pre-built geocellular crate system at a size that will hold the required level of stormwater.
  3. Attenuation Stage 3:
    Stormwater is held in the tank which is wrapped in an impermeable membrane liner - this can be purchased by the roll or as a pre-built shoebox
  4. Attenuation Stage 4:
    A flow control chamber then manages the discharge rate of stormwater into the main surface water drainage network.

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  1. Polydrain HydroCell Soakaway Vertical Shear Clip
    1. Code PDHCSC
    2. Brand Polydrain
    £0.36 £0.43 £0.40 £0.48 Save 10%
  2. Polydrain HydroCell Soakaway Horizontal Clip
    1. Code PDHCC
    2. Brand Polydrain
    £0.36 £0.43 £0.40 £0.48 Save 10%
  3. Polydrain HydroCell 62 Tonne Soakaway Crate - Cubic Metre Kit with Silt Trap
    1. Code PDHCC60M3K
    2. Brand Polydrain
    3. Size 1 Cubic Metre
    £468.00 £561.60 £520.00 £624.00 Save 10%
  4. Polydrain HydroCell 62 Tonne Soakaway Crate - Cubic Metre Kit
    1. Code PDHCC60M3
    2. Brand Polydrain
    3. Size 1 Cubic Metre
    £200.00 £240.00 £222.22 £266.66 Save 10%
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  5. Polydrain HydroCell 62 Tonne Soakaway Crate - 0.2 Cubic Metres
    1. Code PDHCC60
    2. Brand Polydrain
    3. Size 0.2 Cubic Metres
    £40.00 £48.00 £44.44 £53.33 Save 10%
  6. Catchpit Chamber Set - 600mm Diameter x 1075mm Height For 300mm Twinwall with 110mm & 160mm & 225mm Inlets

    Please allow 5-7 working days for delivery

    1. Code AICCP600300B1
    2. Brand Turtle Enviro
    3. Size 600mm Diameter
    £550.00 £660.00
  7. Catchpit Chamber Set - 600mm Diameter x 1555mm Height For 160mm/225mm & 300mm Pipe with 110mm/160mm & 225mm Inlets

    Please allow 5-7 working days for delivery

    1. Code AICCP600B15
    2. Brand Turtle Enviro
    3. Size 600mm Diameter
    £565.71 £678.85
  8. Catchpit Chamber Set - 600mm Diameter x 1450mm Height For 150mm & 225mm Twinwall with 150mm & 225mm Inlets

    Please allow 5-7 working days for delivery

    1. Code AICCP600225150B/1.5
    2. Brand Turtle Enviro
    3. Size 600mm Diameter
    £525.72 £630.86
  9. Catchpit Chamber Set - 600mm Diameter x 1945mm Height For 160mm/225mm & 300mm Pipe with 110mm/160mm & 225mm Inlets

    Please allow 5-7 working days for delivery

    1. Code AICCP600B2
    2. Brand Turtle Enviro
    3. Size 600mm Diameter
    £634.28 £761.14
  10. Packaged Plot Orifice Attenuation System - 2000 Litres with 110mm & 160mm Inlets

    Please allow 10-15 working days for delivery

    1. Code PASO10502000
    2. Brand Turtle Enviro
    3. Size 2000 Litres
    £2,126.03 £2,551.24
  11. Packaged Plot Orifice Attenuation System - 2950 Litres with 110mm & 160mm Inlets

    Please allow 10-15 working days for delivery

    1. Code PASO10503000
    2. Brand Turtle Enviro
    3. Size 2950 Litres
    £2,509.59 £3,011.51
  12. Packaged Plot Orifice Attenuation System - 3800 Litres with 110mm & 160mm Inlets

    Please allow 10-15 working days for delivery

    1. Code PASO10504000
    2. Brand Turtle Enviro
    3. Size 3800 Litres
    £3,017.15 £3,620.58
  13. Packaged Plot Orifice Attenuation System - 5500 Litres with 110mm & 160mm Inlets

    Please allow 10-15 working days for delivery

    1. Code PASO10505500
    2. Brand Turtle Enviro
    3. Size 5500 Litres
    £3,817.14 £4,580.57
  14. Packaged Plot Vortex Attenuation System - 2000 Litres with 110mm & 160mm Inlets

    Please allow 10-15 working days for delivery

    1. Code PASV10502000
    2. Brand Turtle Enviro
    3. Size 2000 Litres
    £2,342.86 £2,811.43
  15. Packaged Plot Vortex Attenuation System - 2950 Litres with 110mm & 160mm Inlets

    Please allow 10-15 working days for delivery

    1. Code PASV10503000
    2. Brand Turtle Enviro
    3. Size 2950 Litres
    £2,685.71 £3,222.85
  16. Packaged Plot Vortex Attenuation System - 3800 Litres with 110mm & 160mm Inlets

    Please allow 10-15 working days for delivery

    1. Code PASV10504000
    2. Brand Turtle Enviro
    3. Size 3800 Litres
    £3,028.57 £3,634.28
  17. Packaged Plot Vortex Attenuation System - 5500 Litres with 110mm & 160mm Inlets

    Please allow 10-15 working days for delivery

    1. Code PASV10505500
    2. Brand Turtle Enviro
    3. Size 5500 Litres
    £3,714.29 £4,457.15
  18. Rainsmart Ellipse Inspection Channel Crate Assembled - Shallow
    1. Code 90003INSP
    2. Brand Rainsmart
    3. Size Single Crate
    £30.70 £36.84 £34.11 £40.93 Save 10%
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