- Project plans
- Project activities
- Legislation and standards
- Industry context
- Specialist wikis
Last edited 27 Aug 2020
Culvert, screen and outfall manual, (CIRIA C786) published by CIRIA in 2019, defines critical flow as the: ‘Free surface flow with minimum specific energy for a given discharge and a Froude (Fr) number of unity.’
Where the Froude number is: ‘A dimensionless ratio between inertia and gravity forces in a fluid, or between mean velocity and wave celerity. Froude number is unity for critical flow, more for supercritical flow and less for subcritical flow.’
 Related articles on Designing Buildings Wiki
Featured articles and news
To support in Social Housing Decarbonisation Fund bids
A must read for all built environment professionals.
A brief description of time in the sun.
Given by ICE President Ed McCann.
Two new research reports published by APM.
50% off APM Associate membership for Designing Buildings users.
A commentary from the insurance perspective.
In brief with further links.
A definitive book on a pioneer of green architecture.
Using heritage as a catalyst for reviving historic centres.
Declaration prioritising sustainable urbanisation adopted.
Some brief words about the actuator.
After 34 years at the Institute.
To support the next generation of engineers.
CIAT reporting from the Competition and Markets Authority.
Making sustainable construction number one priority.
Interview with ECA CEO.
Many provisions came into force on June 28, 2022.
With room to expand.
Refurbishment, Energy Efficiency, Indoor air and process.
Aluminium Composite Panels (ACP) is one example.
Write about something you know, help us build and grow !