Drawing layouts

Graphic showing a plan sketched on a notebook or similar.The following tips will help you draw sanitary drainage layouts. Plans may be sketched on A4 or A3 paper depending on the requirements of the builder or sewer authority. You might like to do a rough sketch on notepaper first.

You may be required by your state or territory authority to use colour to show the different components and features of sanitary drainage systems. The following colours are commonly used.

Red – soil pipes

Blue – waste pipes

Green – soil Vents

Brown – waste vents

Yellow – breather Vents


open  General plan requirements

The following details should be included on all plan layouts:

  • the outline of the building (if not already provided)
  • external wall structures, square to the buildings
  • the title block, street name, site plan and building numbers
  • the north point.
open  Sanitary drainage system requirements

You will no doubt develop your own process to document the layout of sanitary drainage systems. The following points might assist you.

Starting at the authority point of connection:

  • sketch the main drain pipeline
  • sketch the branch drains
  • confirm that all fixtures are connected to the drainage system
  • indicate the location of the overflow relief gully
  • indicate the location of disconnector gullies and/or arrestors that may be required
  • indicate the location of inspection openings
  • indicate the location of any vents.


All states and territories have regulatory requirements related to the planning and documenting of sanitary drainage systems. Talk to your mates about where to get the correct information to ensure compliance with relevant authorities in your state or territory.

Required documentation could include:

  • a permit
  • a compliance certificate
  • a road opening fee
  • footpath openings
  • proof of services searches.

You will need access to this type of information to complete your planning and layout documentation for the sanitary drainage jobs you do.