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GMS - Specified Flow boundary condition

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I am trying to add a specified flow boundary condition to my model to simulate additional recharge that enters from uphill (which is not covered in my modeled area). I have an estimated inflow value of 468,307 m^3/d, which I want to apply to an arc boundary condition. The arc length is 24,880 m, which intersects a total of 819 cells over 21 layers. If I want the inflow to enter through the entire side of my model (through all 819 cells), what flow rate value would I need to enter for my specified flow arc? Do I need to divide my estimated inflow value by the length of the arc? 

Thank you,


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