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.

If you are looking for assistance with an infiltration project then we can help. Get in touch today.

Read more details

View as Grid List

Items 1-18 of 133

Page
  1. Rainsmart Soakaway Crate Flat-Packed - Heavy 65 Tonne - OUT OF STOCK

    Expected w/c 12th July

    1. Code STM02DF
    £63.25 £75.90
  2. Rainsmart Soakaway Crate Assembled - Heavy 65 Tonne - OUT OF STOCK

    OUT OF STOCK - Item will be despatched when stock is received

    1. Code STM02D
    £68.75 £82.50
  3. Rainsmart Soakaway Crate Flat Packed - Heavy 65 Tonne Shallow - OUT OF STOCK

    OUT OF STOCK - Item will be despatched when stock is received

    1. Code STM01F
    £37.95 £45.54
  4. Rainsmart Soakaway Crate Assembled - Heavy 65 Tonne Shallow - OUT OF STOCK

    OUT OF STOCK - Item will be despatched when stock is received

    1. Code STM01
    £42.35 £50.82
  5. Rainsmart 65 Tonne Heavy Triple Soakaway Set Flat-Packed 1 Cubic Metre - OUT OF STOCK

    OUT OF STOCK - Item will be despatched when stock is received

    1. Code STM03M3F
    £262.90 £315.48
  6. Rainsmart 65 Tonne Heavy Triple Soakaway Crate Flat-Packed - OUT OF STOCK

    OUT OF STOCK - Item will be despatched when stock is received

    1. Code STM03F
    £94.05 £112.86
  7. Rainsmart 65 Tonne Heavy Inspection Channel Crate Flat-Packed - Double - OUT OF STOCK

    OUT OF STOCK - Item will be despatched when stock is received

    1. Code STM02FINSP
    £63.25 £75.90
  8. Rainsmart 65 Tonne Heavy Inspection Channel Crate Assembled - Double - OUT OF STOCK

    OUT OF STOCK - Item will be despatched when stock is received

    1. Code STM02INSP
    £68.75 £82.50
  9. Rainsmart 65 Tonne Heavy Inspection Channel Crate Flat-Packed - Shallow - OUT OF STOCK

    OUT OF STOCK - Item will be despatched when stock is received

    1. Code STM01FINSP
    £37.95 £45.54
  10. Rainsmart 65 Tonne Heavy Inspection Channel Crate Assembled - Shallow - OUT OF STOCK

    OUT OF STOCK - Item will be despatched when stock is received

    1. Code STM01INSP
    £42.35 £50.82
View as Grid List

Items 1-18 of 133

Page