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.'
[edit] Related articles on Designing Buildings Wiki
Featured articles and news
A quick introduction to a very complicated subject.
CIOB suggests the economic reach of construction is double the official figures.
Center for Sustainable Landscapes
The first US building to achieve BREEAM Outstanding In-Use.
70 buildings from 70 years of Concrete Quarterly. Book review.
An early stressed-skin structure
Conserving the iron roof at the Albert Dock.
People, principles and performance
Delivering an infrastructure revolution.
The admissibility of evidence.
How many can you name? 37 anyone?
CIOB respond to the points-based system.
When is the weather considered 'exceptionally adverse'?
ECA backs call for a rolling programme of rail electrification.