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Selecting the right drainage system

The requirements of a drainage system differ widely across specifc applications within a building. Each drainage element must be carefully considered to assess their visual and functional impact on a buildings design.

Choosing The Right System


The aesthetics of a drainage system must be carefully considered to ensure it is consistent with the designer’s visual project objectives.

Selecting drainage that enhances or blends with the aesthetic is an important consideration as drainage is used frequently across
commercial and residential buildings.

Sizing and hydraulics

To ensure a building and its elements have the appropriate barrier protection, an assessment of the hydraulic capacity of both the channel and grate is essential.

A correctly specifed drainage system stops rainwater transgressing into a building or into other sensitive areas. Catchment hydraulics are site-specifc and therefore require specifc calculations to ensure drainage systems are correctly selected and sized.

Specific site and user requirements

For every application consider:

  • Traffic flow: bare feet, heels, vehicles
  • Local environment: proximity to the ocean, a swimming pool or other harsh environment
  • Legislative requirements: slip resistance, aesthetics, load ratings

There are other application-specific considerations to select the right drainage system:

greef roofsGreen roofs

Water management in a green roof is vital to keep plants and vegetation with a natural supply of water, whilst protecting against the effects of standing water.

  • Depth of soil overlying the slab?
  • How will the drainage interface with waterproof membrane?

balcony or terracesBalcony or terrace

  • Depth available in the slab for drainage?
  • Where should the drainage element be positioned in the slab, relative to the door?

door thresholdsDoor threshold

  • Is a level threshold required for accessibility?
  • What door profile is being used and how will it integrate with the drainage element?
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