Hello everyone
I am using the invest model for the first time, so I want to ask some questions about data.
“depth of rainfall (mm)”-- Is this the largest daily precipitation in a year? Or the total precipitation during the typhoon? Or can you determine the data according to your research purpose?
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Hi @haojie,
As the user’s guide appendix states, it is the “Depth of rainfall event of interest (mm). To calculate the design storm, users can look up intensity-frequency-duration (IFD) tables available for their city” Here is an article that explains the concept of a design storm. So yes, you can choose the depth of rainfall according to your goals. It could be the average precipitation, or the largest in a year, or the largest ever, etc.
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Thank you very much for your answers
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Dear @esoth,
I have found the intensity-frequency-duration curves for my area of interest, but these are for every rain station installed. There are at least 7 in the area of interest. What do you think is best to do: do I refer to data from only one of these, do I average the available data from the 7 stations, or something else?
Thank you,
Antonio
Hi @antobaro ,
Since the model does not consider the spatial distribution of precipitation for a storm event, you’ll have to make a choice about the storm event (and resulting expected precipitation) that you would like to model. If the intent is to model a “typical” storm event, for example, then the average of the various rain stations might suffice. If, on the other hand, the intent is to model a heavy storm event, then it might make sense to take the maximum precipitation depth across all of the rain stations, maybe even over the past few years.
Often times, analyses might include a number of different model runs under different scenarios and then compare the results.
Hope this helps!
James
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Much clearer, thank you @jdouglass!
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