- 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
The teacher, architectural technologist and mum offers her insights.
Careful planning needed as supply chain issues continue.
The sensitive conversion of a neglected Cornwall structure.
Plan stresses local involvement in city, town and village development.
Environment Agency publishes BAT guidance.
CLC guidance outlines carbon reduction priorities.
Making the most of a staycation.
Organisation urges G20 to revisit wind energy.
The historian spent much of his life compiling architectural resources.
How technology can expose efficiency levels in existing buildings.
The garden heritage of Oxford and Cambridge. Book reviews.
Building capacity to better manage heritage.