When designing box gutters to the australian plumbing code as nzs 3500 we design them for a once in 100 year storm event.
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To meet the performance requirements gutters need to be installed with sufficient downpipes to collect and dispose of water resulting from a storm having an average recurrence interval ari of 20 years.
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Depending on the material rain gutters generally last anywhere from a decade to 100 years with vinyl and steel the most popular and affordable gutter materials least durable and copper the.
Gutters are required to be installed using an overflow method that will avoid water entry into the building from a storm having an average recurrence interval ari of 100 years.
An inch of rain is not much but it if falls in half an hour it could flood a gutter.
So 1 1 100 1 100 therefore a 1 aep 1 100 year ari.
Now box gutters have always had a bad reputation for causing damage.
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The total rainfall and how rapidly it falls will affect the runoff from the roof.
Gather some basic weather information to calculate the proper size for gutters and downspouts for a house.
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The rain intensity according to table 1 2 rainfall data and drainage factors uses a 5 minute duration for a 10 year or 100 year storm thereby providing a worst case scenario for the downspout and gutter design.
It seems that everyone thought a 1 in 100 year storm would occur exactly once every 100 years.
But in reality it is just a design terminology to take a guess at the storm intensity that on average may occur at that frequency.
But with the advent of as nzs 3500 giving a concise method of designing box gutters there should be no damage for all storms up to at least a 1 in 100 year event.
Valley and parapet gutter return period of 50 years equivalent to cat 2 with a design life of approximately 30 years for other design rainfall intensities separate calculations will be required.
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Eaves gutters and flat roofs return period of 1 year.