Hello fellow 'gators' (not sure if that's what we call ourselves...)
I'm in need of some advice/links.
I'm wanting to generate city-specific Intensity/Duration/Frequency data that accounts for recent changes in rainfall patterns.
As we know the rains are-a changing and therefore our design storms and Green Infrastructure capacities should evolve in turn.
I want to take a specific city, and compare the "old" curves to the new (+future?) ones.
I am aware of how to download historical rainfall data from NOAA's Atlas 14 mission, but I'm looking for some shortcuts if you will:
Is there a specific type of "freeware" that does this automatically??
A spreadsheet that someone's developed and can share?
A manual method that can be elucidated?
Please advise, I'm sure I'm not the only one who ponders on these things.
I had a similar problem, few years back, requiring updating I-D-F curves for a particular river basin in Sri Lanka with recent data. I did it manually using the rainfall records from a station (Ratnapura), located centrally in the river basin. Finally, I found that there was not significant change in I-D-F relations of that station and therefore decided to use the previously developed curves for my designs with respect to that particular river basin. The entire procedure was published in a local magazine and later in ‘ResearchGate’ for the use of other researchers and designers facing similar problems. I hope that may be useful for you also. If so, you may refer into https://www.researchgate.net/publication/328686856_Development_of_Rainfall_Intensity_Duration_Frequency_I-D-F_Relations_for_the_Kalu_Ganga_Catchment_Sri_Lanka.
The R programming language has various packages and scripts that can assist in calculating IDF curves. For example, the 'rainfreq' package in R provides functions to analyze and generate IDF curves using data from NOAA Atlas 14. While this involves coding, it offers automation once the script is set up.
Leelambar Singh thank you for this helpful response. Can you let us know if this R script allows the import/comparison of different date ranges? Also wondering what the data input / data prep requirements are for this. I know many in our discipline are quite intimidated by the R GUI (myself included). A quick search indicates that it has been removed from CRAN and other online repositories which would describe its actual use.
Prema Hettiarachchi I notice that you started from Pluviographs in this research. Could we instead use the data directly accessible from NOAA Atlas 14? How to adjust this approach when they provide csv files that use things like DAPR=Number of days included in the multiday precipitation total, and MDPR=Multiday precipitation total (tenths of mm). I am still a bit confused actually.
Also just found this interesting open-source tool: RainIDF
An Excel add-in for derivation of rainfall intensity-duration-frequency (IDF) curves, based on annual maxima and partial duration series.
A research paper for RainIDF has been published in Journal of Hydroinformatics: http://www.iwaponline.com/jh/015/jh0151224.htm
System & Requirements: Windows PC Microsoft Excel 2007/2010
https://github.com/kbchang/rainidf
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