Technical Paper NO. 40

Rainfall Frequency Atlas of the Eastern United States
for Duration from 30 minutes to 24 hours and
Return Periods from 1 to 100 years

30Minute Rainfall

One Year 30 Minute Rainfall (inches)
Two Year 30 Minute Rainfall (inches)
Five Year 30 Minute Rainfall (inches)
Ten Year 30 Minute Rainfall (inches)
Twenty Five Year 30 Minute Rainfall (inches)
Fifty Year 30 Minute Rainfall (inches)
One Hundred Year 30 Minute Rainfall (inches)

1 Hour Rainfall

One Year 1 Hour Rainfall (inches)
Two Year 1 Hour Rainfall (inches)
Five Year 1 Hour Rainfall (inches)
Ten Year 1 Hour Rainfall (inches)
Twenty Five Year 1 Hour Rainfall (inches)
Fifty Year 1 Hour Rainfall (inches)
One Hundred Year 1 Hour Rainfall (inches)

2 Hour Rainfall

One Year 2 Hour Rainfall (inches)
Two Year 2 Hour Rainfall (inches)
Five Year 2 Hour Rainfall (inches)
Ten Year 2 Hour Rainfall (inches)
Twenty Five Year 2 Hour Rainfall (inches)
Fifty Year 2 Hour Rainfall (inches)
One Hundred Year 2 Hour Rainfall (inches)

3 Hour Rainfall

One Year 3 Hour Rainfall (inches)
Two Year 3 Hour Rainfall (inches)
Five Year 3 Hour Rainfall (inches)
Ten Year 3 Hour Rainfall (inches)
Twenty Five Year 3 Hour Rainfall (inches)
Fifty Year 3 Hour Rainfall (inches)
One Hundred Year 3 Hour Rainfall (inches)

6 Hour Rainfall

One Year 6 Hour Rainfall (inches)
Two Year 6 Hour Rainfall (inches)
Five Year 6 Hour Rainfall (inches)
Ten Year 6 Hour Rainfall (inches)
Twenty Five Year 6 Hour Rainfall (inches)
Fifty Year 6 Hour Rainfall (inches)
One Hundred Year 6 Hour Rainfall (inches)

12 Hour Rainfall

One Year 12 Hour Rainfall (inches)
Two Year 12 Hour Rainfall (inches)
Five Year 12 Hour Rainfall (inches)
Ten Year 12 Hour Rainfall (inches)
Twenty Five Year 12 Hour Rainfall (inches)
Fifty Year 12 Hour Rainfall (inches)
One Hundred Year 12 Hour Rainfall (inches)

24 Hour Rainfall

One Year 24 Hour Rainfall (inches)
Two Year 24 Hour Rainfall (inches)
Five Year 24 Hour Rainfall (inches)
Ten Year 24 Hour Rainfall (inches)
Twenty Five Year 24 Hour Rainfall (inches)
Fifty Year 24 Hour Rainfall (inches)
One Hundred Year 24 Hour Rainfall (inches)

Probable Max 6 hour rainfall (inches)
Ratio of Probable Maximum 6 Hour Rainfall to 100 Year 6 Hour Rainfall (inches)

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