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About Zia

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  1. I am using HEC-HMS version 3.3 to model snowmelt, and have following question: 1. I have tried different sets of ATI (antecedant temperature index) meltrate function but every time I get the error message "Requested interpolation value is above the last value in table of ATI meltrate function". What are reasonable values for the ATI meltrate function? Please see attached the table I am using as ATI meltrate function. 2. When I run the model, I get an error message that melt rate is undefined for my first time step (even though I have numbers for ATI function and coefficient. How can I correct
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