The 12d Model Stormwater Drainage Design will improve the productivity of designers by giving them powerful techniques and tools for the design and analysis of Stormwater Drainage Systems for urban and highway drainage.

Stormwater Drainage Day 1

  • Create a stormwater drainage network
  • Model other utility services and check for clashes
  • Label the network
  • Producing plotted output for use in drawings.


  • Completed the ‘Introduction to 12d Model’ training course OR
  • A good understanding of the use of 12d Model for modelling surfaces and creating strings OR
  • Attended the ’12d Model Basics for Water Resource Engineers’ – a preparatory session in the use of 12d Model
  • An understanding of design concepts related to Stormwater Drainage design in Australia


At the end of the course, participants will be familiar with the use of 12d Model for creation of stormwater drainage networks, for ensuring that the stormwater network does not clash with other utility services, and for producing output for drawings

Course Summary

These sessions covers the creation of a network of pits and pipes for stormwater drainage, and creation of other necessary inputs to the design process.
We introduce the Water Network Editor (WNE) as the main tool to size and grade pipes, set cover levels, and as the entry point for plotting and analysis.

Specific elements covered:-

  • Setting up a combined Finished Surface from road design and survey data.
  • Locating (and marking) low points on the road design strings.
  • Creating a network of pits and pipes, and grading the network using the Drainage Network Editor.
  • Assigning pit names and labeling the pits.
  • Identifying the parts of the road design relevant to the drainage design and creating a ‘road design file’ that lists these strings.
  • Labeling the network with linestyles and symbology suitable for presentation drawings or export to CAD.
  • Modelling underground services (water mains and utility duct banks) in 3D, and checking for clashes between the services and the drainage lines.
  • Adjusting the invert levels of the pipes to ensure clearance to other services.
  • Introduction to 12d Model’s use of Attributes, and how attributes on the drainage network are used to produce reports/setout tables and the like.
  • Creating longsection plots of the network