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To whom it may concern
how can i establish IDF curve for urban area having 24hour rainfall recorded data of 26 year from one station

RE: hydrology

I did a Google search using how to develop an intensity duration frequency curve from historical rainfall data (no quotes) and turned up quite a few articles that may help you. The first one I looked at (http://www.engr.colostate.edu/~ramirez/ce_old/clas...) appears to be a good start. I even downloaded a copy of it to my personal electronic engineering library, which is now pushing 12GB of civil engineering goodness.

A couple general comments for anyone who asks questions of this sort here (I'm not picking on you):
-- Many questions (like this one) do not have a simple answer or cannot be solved using a simple step-by-step procedure. For this reason, it may be difficult to impossible to provide a simple answer in an Internet forum that you can rely on.* As you can see from the document I referenced above, there is a fair bit of work involved in developing IDF curves. Stated another way: IDF curves are conceptually simple and tedious to prepare.
-- The Google search I just performed took me less than 5 seconds to type the search parameter and get Google's responses; it would have taken you or anyone else about the same amount of time. Between Google and Google Scholar, you can almost always quickly find something applicable to your question....if you know how to search intelligently. Related to this point is my admonition to first do your own diligent search. You will learn a lot more about your question (and related questions) by self-search and self-study than you will by just relying on this forum for ready answers. I (we?) like to help, but I (we?) prefer to help someone who has done some of their own legwork.

* An example of my own similar naivete: When I was fresh out of college in 1980, I had a series of problems to solve that required using a certain computer software program (for you old timers, the software was Sells COGO). One of the engineers in my office suggested I talk to a particular engineer in another office who was very experienced with this software. So, I called the engineer in the other office (who turned out to be the older brother of a high school classmate) and asked "how do you use this program?" He just laughed at me, and rightly so. When he calmed down, he said he would send me a copy of the software manual. When the manual arrived, I understood fully why he had laughed at me. The manual was nearly 300 pages and the software had many dozens of commands, functions, and options. I now had a mountain to climb, so I pitched in and by self-study and practice became an expert myself with this program.

"Is it the only lesson of history that mankind is unteachable?"
--Winston S. Churchill

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