100-year event - Revision history

Designing Buildings at 07:01, 2 February 2021

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	A 100-year event (or 100-year return period event) is an event that occurs (or is exceeded) on average once in every one hundred years (such as a storm, flood or rainfall event). This can also be expressed as 1 in 100 or 1:100.		A 100-year event (or 100-year return period event) is an event that occurs (or is exceeded) on average once in every one hundred years (such as a storm, flood or rainfall event). This can also be expressed as 1 in 100 or 1:100.
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Designing Buildings at 14:09, 14 March 2019

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	A 100-year event (or 100-year return period event) is an event that occurs (or is exceeded) on average once in every one hundred years (such as a storm, flood or rainfall event). This can also be expressed as 1 in 100 or 1:100.		A 100-year event (or 100-year return period event) is an event that occurs (or is exceeded) on average once in every one hundred years (such as a storm, flood or rainfall event). This can also be expressed as 1 in 100 or 1:100.

Designing Buildings: Created page with "A 100-year event (or 100-year return period event) is an event that occurs (or is exceeded) on average once in every one hundred years (such as a storm, flood or rainfall event)...."

2019-03-14T14:08:48Z

Created page with "A 100-year event (or 100-year return period event) is an event that occurs (or is exceeded) on average once in every one hundred years (such as a storm, flood or rainfall event)...."

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A 100-year event (or 100-year return period event) is an event that occurs (or is exceeded) on average once in every one hundred years (such as a storm, flood or rainfall event). This can also be expressed as 1 in 100 or 1:100.

For example, a 100-year storm is a storm that is likely to occur once every hundred years.

A ‘return period’ is an estimate of the likelihood of a particular event occurring. The return period of a rainfall event is the average time between events of at least a given magnitude.

Events can also be described by their ‘probability of occurrence’ (or frequency of occurrence) which is expressed as a percentage, or as 1 divided by the return period. The probability of occurrence of a 100-year event is 1%.

The ‘critical duration’ is the duration of the event for a specified return period event.

Ref CIRIA. 2015. C753. The SuDS Manual.

= Related articles on Designing Buildings Wiki =

* BREEAM Surface water run-off
* Building Research Establishment.
* Design flood event.
* Design flood level.
* Flood.
* Greenfield run-off rate
* Greenfield volume of run-off
* Home Quality Mark.
* Sustainable urban drainage systems.

[[Category:Standards_/_measurements]]