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What is your orifice offset? Why is the volume still decreasing for 96 hour - where is the water going? Is your extended time 20 hours minus the time of peak volume?

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Hello SWMMers, I am trying to calculate extended detention time for 25mm Chicago 4 hours storm. I plotted inflow v/s outflow graphs as well as volume v/s time graphs and came to know that we have outflow for initial 20 hours based on the storm event and then zero outflow through orifice. Similarly, volume reduces to half within 9 hours of reaching peak, 

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