lack of precipitation data

[Laura]

Hello! I want to know How I can minimize the effect caused by the lack
of precipitation stations. The problem I have is that it considers the
rainfall in one day for a very large surface therefore generates very
high flows . Anyone know of any work that addressed this problem?
thank you very much

[Justin Goldstein]

Depends on your study area.  Is your area in the US, and if so, have you checked out the National Climatic Data Center's website to locate rainfall stations?  If that doesn't work or the precipitation data are lacking (e.g. very localized storms that occur in between precipitation stations), there is an extension to SWAT called NEXRAD-SWAT in which you feed in NEXRAD precipitation data estimates which are interpolated into each subbasin; you'd have to contact your local river forecast center to obtain the radar estimate files, though.  More information about this product, including the technical specifications necessary to run it and how you can download it, can be located at http://xzhang.pbworks.com/w/page/27189956/FrontPage  I don't know about areas outside the US, though; there is a global historical climatology network (http://www.ncdc.noaa.gov/ghcnm/) but I've never worked with it.  Good luck!

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