Appropriate duration for 10 Year Rainfall
Appropriate duration for 10 Year Rainfall
(OP)
If the Council requirement is to design the structure for a 10 Year design frequency.
Can someone please explain which stormwater duration is appropriate to use for the design of say drains within a commenrcial area? I was thinking of using rainfall duration of 10 minutues to size the drains.
Can someone please explain which stormwater duration is appropriate to use for the design of say drains within a commenrcial area? I was thinking of using rainfall duration of 10 minutues to size the drains.





RE: Appropriate duration for 10 Year Rainfall
RE: Appropriate duration for 10 Year Rainfall
Yes, for this site, the time of concentration is 10 minutes. So will use "rainfall duration" of 10 minutes intensity with frequency of 1 in 10 year for design of drainage structures.
For example in Florida.
1 in 10Y Rainfall intensity(10 minutues duration)=7.5in/H
1 in 10Y Rainfall intensity(60 minutes duration)=3.2in/H