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For a large catchment (>1000ha) I'm looking for some method to use a area reduction factor to adapt precipitation values. I have a large dataset of daily precipitation values but I have to use some kind of adaptation. I have don't enough data to calibrate a rainfall runoff model.
I have looked in some literature but there is little generally usable information. Does someone has a good reference for me? Thanks in advance.
The answer depends on whether your data is from a single gauge or a network of gauges, and whether you have storm tracking data or not. Sounds to me like you have daily precip at a single gauge without much more information. If you know the annual average precipitation in the basin then a simple area reduction factor (ARF) calculation is basically the ratio of the annual average gauge precipitation over the basin average.
I am not too familiar with the literature on this, but this report seems like a good starting point for background info.
