Marshalls CPM has developed an offsite solution for the requirement of installing a dry-flow channel into concrete flexible jointed pipes to respond to the needs of contractors and designers alike.

The machine made one-piece solution is available in a 1500mm diameter with channel options of 150mm, 225mm and 300mm and increases the water flow velocity and prevents the settlement of solids or water in the system. When flooding or high flow levels are in action, the open channel overflows, stimulating the full volume of pipe.

This enables the water and sewage to move freely, during both high and low flow levels, eliminating blockages in the system.

Benefits of the system include:
  • Removes the problem of confined space working.
  • Considerable reduction in on-site construction time.
  • Can reduce costs associated with in-situ construction by 50%.
  • Can reduce over-pumping costs by 15%.
  • Can be included as part of Off-Site Attenuation components


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  • How frequent should I be testing the pipeline during installation?

    It is highly recommended to test the pipeline every 3 or 4 pipes laid as an absolute minimum (do not wait until whole line is installed before carrying out such test).

  • What are the recommended minimum depths of cover for concrete pipes?

    Minimum depth of cover to top of pipes is 0.6m with bedding class S (360o granular bedding). For cover depths less than 0.6m, then the pipeline should be protected with either a full concrete surround, or a reinforced concrete slab should be placed over it (spanning sufficient distance onto trench walls).

  • What is the most likely cause of air test failure for a concrete pipeline on site?

    Common causes of air tests failures include:

    • Displaced seals (usually due to use of wrong pipe lubrication during installation).
    • Poor laying technique.
    • Faulty testing equipment.
    • Poor seal between testing equipment and face of concrete pipe.
  • What is the recommended maximum jetting pressure acceptable for concrete products?

    5000 psi is the generally accepted maximum, although higher pressure can be accommodated by concrete drainage products.

  • What materials can be used as backfill for a concrete pipeline?

    In many situations the ‘as-dug’ trench material is suitable for backfill (should be readily compactable and free from large boulders etc).

Got a question?

To find out more about Dry Weather Flow Pipes, please call our Sales Team or fill out the enquiry form and we’ll get back to you within 24 hours.

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