Hi, i hope someone can help me about this misunderstanding:  considering a single precipitation event, i can not undestrand if i have to insert, as imput, the "initial build up" or the "antecedent dry days", or both of them. I guess i have to set only the "initial build up"  (because, knowing antecedent dry days, i can estimate it), is that so?

Instead, in a continuos simulation, what should i do? I guess, in this case, that SWMM derives "antecedent dry days" directly from time series, and "initial build up" (before each event) considering the material's quantity not washed during the previous event...

I'm sorry for my english, I hope I was clear, and that someone can explain this question

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Replies

  • Initial buildup is ONLY used if you are modeling buildup for water quality in SWMM 5.  The antecedent dry days is used for hydrology and determines the "wetness" of the soil.  I hope this helps.

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