Critical duration event
The SuDS Manual published by CIRIA in 2015 defines a critical duration event as:
‘The duration of rainfall event likely to cause the highest peak flows or levels at a particular location, for a specified return period event.’
Where a rainfall event is: ‘A single occurrence of rainfall before and after which there is a dry period that is sufficient to allow its effect on the drainage system to be defined.’
And a return period is: ‘An estimate of the likelihood of a particular event occurring. A 100-year storm refers to the storm that occurs on average once every hundred years. In other words, its annual probability of exceedance is 1% (1:100).’
A design event is: 'A synthetic rainfall event of a given duration and return period that has been derived by statistical analysis.'
Rainfall intensity is the: ‘amount of rainfall occurring in a unit of time, expressed in mm/hr.’
[edit] Related articles on Designing Buildings Wiki
Featured articles and news
Incorporating EDI into the provision of fair access.
Government announces global innovation strategy.
An architectural biography. Book review.
Restoring Orleans House Octagon
The house where the future king of France lived.
The teacher, architectural technologist and mum offers her insights.
Cable management materials shortage
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.
Carbon capture technology update
Environment Agency publishes BAT guidance.
C02nstruct Zero Performance Framework published
CLC guidance outlines carbon reduction priorities.
Bridge hopping highlights around the UK
Making the most of a staycation.
Organisation urges G20 to revisit wind energy.