Sanjay Khadka,

There are some temporal distributions of intensity which you can multiply in a total rain for a "day" (or week or hour) and it converts it to hourly peaks (one or two humps). However those temporal distributions are location dependent. I know for united states it exists in NOAA webpage and most of municipalities provide that. May be you want to check the local standards or recommendation books for hydrology and stormwater design first.

Dear Kavah

Although you can use satellite based information to disaggregate daily rainfall to hourly rainfall these should not be the thing you use. This is because although they will give you some idea as to how the rainfall has varied over a day you are carrying out drainage modelling.

I would suggest that you use disaggregation factors based on observed rainfall data from rainfall gauges rather than satellites.

This paper "Estimation of hourly rainfall design intensity from 24 -hour maximum

rainfall: the context of Nepal" see: Article Estimation of hourly rainfall design intensity From 24 -hour...

provides estimated rainfall intensities in mm/minute for return periods of 1 in 10, 1 in 33, 1 in 50, 1 in 100 and 1 in 300. However, it may be challenging to use these values to disaggregate your rainfall of 357 mm in 24 hours.

This paper "Development of monsoonal rainfall Intensity-Duration-Frequency (IDF) relationship and empirical model for data-scarce situations: The case of the Central-Western Hills (Panchase Region) of Nepal" see: Article Development of Monsoonal Rainfall Intensity-Duration-Frequen...

I think is more helpful as it uses 33 years of rainfall data from Pokahara airport. This paper is helpful. Even if you cannot use it to accurately disaggregate your 24 hour rainfall you can use it to get design rainfalls for your SWMM model.

I hope that this is of help.

Darren

Dear Mr.Sanjay Khadka,

I advise you to use the effect factors extracted from the observed data instead of the satellite data because it is more accurate as Mr Darren Lumbroso said

Good luck.

Sanjay,

Have you checked those 2 articles provided by Darren?

-Keshav