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Precipitation data time step in Hec-HMS

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Hello!

I'm runningĀ precipitation data every 10 min in a small watershed, using SCS Curve Number, Clark Unit hydrograph and Recession methods. When I'm trying to distribute the 10 min data in hourly data, I notice that the peak flow of the flow hydrograph is a little reduced. But trying to distribute the 10 min data to 5 min data, IĀ find that both hydrographs are the same. Is there a threshold in the time step of precipitation data that Hec-HMS produces the same results?

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