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. Rainsmart Ellipse Soakaway Crate Flat-Packed
    1. Code 90004F
    2. Brand Rainsmart
    3. Size Single Crate
    £57.59 £69.11
  2. Rainsmart Ellipse Soakaway Crate Assembled
    1. Code 90004
    2. Brand Rainsmart
    3. Size Single Crate
    £61.47 £73.76
  3. Rainsmart Ellipse Soakaway Set Flat-Packed 1 Cubic Metre
    1. Code 90004M3F
    2. Brand Rainsmart
    3. Size 1 Cubic Metre
    £219.94 £263.93
  4. Rainsmart Ellipse Soakaway Set Assembled 1 Cubic Metre
    1. Code 90004M3
    2. Brand Rainsmart
    3. Size 1 Cubic Metre
    £245.81 £294.97
  5. Rainsmart Ellipse Soakaway Set Flat-Packed with Silt Trap & Lid 1 Cubic Metre
    1. Code 90004M3FK
    2. Brand Rainsmart
    3. Size 1 Cubic Metre
    £540.00 £648.00
  6. Rainsmart Ellipse Soakaway Set Assembled with Silt Trap & Lid 1 Cubic Metre
    1. Code 90004M3K
    2. Brand Rainsmart
    3. Size 1 Cubic Metre
    £570.00 £684.00
  7. Rainsmart Soakaway Crate Flat-Packed - Heavy 65 Tonne
    Out of Stock

    ON BACK ORDER - Please contact us for availability and alternatives

    1. Code STM02DF
    2. Brand Rainsmart
    3. Size Single Crate
    £63.25 £75.90
  8. Rainsmart Soakaway Crate Assembled - Heavy 65 Tonne
    Out of Stock

    ON BACK ORDER - Please contact us for availability and alternatives

    1. Code STM02D
    2. Brand Rainsmart
    3. Size Single Crate
    £68.75 £82.50
  9. Rainsmart Soakaway Set Flat-Packed - Heavy 1 Cubic Metre
    Out of Stock

    ON BACK ORDER - Please contact us for availability and alternatives

    1. Code STM02M3F
    2. Brand Rainsmart
    3. Size 1 Cubic Metre
    £225.50 £270.60
  10. Rainsmart Soakaway Set Assembled - Heavy 1 Cubic Metre
    Out of Stock

    ON BACK ORDER - Please contact us for availability and alternatives

    1. Code STM02M3
    2. Brand Rainsmart
    3. Size 1 Cubic Metre
    £247.50 £297.00
  11. Rainsmart Ellipse Shallow Soakaway Set Flat-Packed 1 Cubic Metre - Option 1
    1. Code 90003F
    2. Brand Rainsmart
    3. Size 1 Cubic Metre
    £239.35 £287.22
  12. Rainsmart Ellipse Soakaway Set Shallow Flat-Packed 1 Cubic Metre - Option 2
    1. Code 90003FV2
    2. Brand Rainsmart
    3. Size 1 Cubic Metre
    £239.35 £287.22
  13. Rainsmart Soakaway Set For Heavier Soils Flat-Packed 1 Cubic Metre
    1. Code 80001M3F
    2. Brand Rainsmart
    3. Size 1 Cubic Metre
    £339.77 £407.72
  14. Rainsmart Soakaway Set For Heavier Soils Assembled 1 Cubic Metre
    1. Code 80001M3
    2. Brand Rainsmart
    3. Size 1 Cubic Metre
    £365.91 £439.09
  15. Rainsmart Soakaway Set Shallow for Heavier Soils Flat-Packed 1 Cubic Metre
    1. Code 80001M3FSHALLOW
    2. Brand Rainsmart
    3. Size 1 Cubic Metre
    £403.81 £484.57
  16. Rainsmart Ellipse Soakaway Crate Spare Large Plate
    1. Code 90001
    2. Brand Rainsmart
    £5.09 £6.11
  17. Rainsmart Ellipse Soakaway Crate Spare Small Plate
    1. Code 90002
    2. Brand Rainsmart
    £3.69 £4.43
  18. Rainsmart Ellipse Soakaway Crate Spare Inspection Plate
    1. Code 90040
    2. Brand Rainsmart
    £3.69 £4.43
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