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Below Ground Building Drainage

Upcoming Courses 
Key Areas  
Course Content
Learning Outcomes
Who Should Attend
Course Timings
Course Fees
In-House Training

A full overview and agenda, need to know information, and booking instructions can be found on the individual upcoming course pages. Click on a course below to view.

Upcoming Courses 

13 March London Find out more
14 July London Find out more
12 November London Find out more

Key Areas  

  • Generic drainage technology
  • Wastewater design criteria
  • Pumped Basement drainage considerations and anti-flood measures
  • Surface water design criteria
  • SUDS techniques
  • Alternative drain pipe materials

Course Content 

A general introduction to below ground building drainage systems, covering the key features of typical drainage systems, explaining practical applications, and including some drain sizing examples.

Session 1: Drainage Principles
  • Introduction- case study
  • Drains and sewers: an explanation
  • Types of drainage systems
  • Functional requirements for drainage
  • Falls, gradients and self-cleansing velocity
  • Bedding for drainage pipes
  • Points of access and inspection  

Session 2: Foul Drainage 
  • Determining discharge rates in foul systems
  • Discharge stack connections/ use of stub stacks
  • Intercepting traps and trapped gullies
  • Ventilation of foul drainage systems including air admittance valves
  • Grease from catering- how to deal with it and why

Session 3: Surface Water Drainage 
  • Flood risk assessment and discharge rates in surface water systems
  • Rainwater drainage system connections
  • SUDS and attenuation requirements/ fast or slow water?
  • Green or Blue roofs and rainwater harvesting
  • Soakaways and infiltration systems including permeable paving
  • Gullies and linear drainage products

Session 4: Special applications, material types, testing and maintenance 
  • Petrol interceptors and separators- types and classes
  • Septic tanks, cesspits and sewage treatment systems
  • Basements- sump pumps, lift stations and anti-flooding valves
  • Cavity drainage systems
  • Fire-fighting lift drainage – what are the options?
  • Drain pipe materials and fittings
  • Testing and maintaining drainage systems
  • References, bibliography and recommended reading    

Learning Outcomes

  • Define typical drainage terminology
  • Manipulate drainage gradient information
  • Describe the basic principles of drainage bedding
  • Explain the alternative access provisions
  • Determine wastewater design flows
  • Explain Basement pumping and anti-flooding considerations
  • Describe the alternative grease prevention measures
  • Determine surface water design flows
  • Describe the three main SUDS techniques
  • Name the three main types of petrol interceptors 
  • Explain the benefits and disadvantages of typical alternative drain pipe materials
  • Describe the main inspection and testing methods

Who Should Attend 

This course is designed for people with limited knowledge of below ground drainage systems who require a general overview of the whole subject covering the features that may be encountered in a typical building drainage scheme.

Course Timings 

Registration will be at 09.30
Start Time: 10.00
Latest Finish: 5.00

Course Fees 

  • Members Rate: £336 (£280 ex VAT)
  • Standard Rate: £372 (£310 ex VAT)

In-house training at your site

Training multiple staff at once provides the opportunity for your organisation to have a training package crafted to your specific needs. In-house training can help your organisation overcome challenges and fill the skills gaps in your workforce. Courses run on a minimum number of six staff*.

For an In-house quote please email the following information to

  1. Name of course
  2. Approximate number of staff
  3. Your site address  

*Minimum numbers for In-house courses outside of the UK may vary

To contact the CIBSE Training Team with a query please

Email: or call: +44 (0)20 8772 3660