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how to add a specified flow boundary condition


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in my model i had 3 types of boundary conditions one of them is specified flux 

i used the modflow-2000 >>package LPF

i drew the arcs then chose the type of arc to be specified flow and entered a value 

the i built the 3D grid and ran the model it gave error 

i tried for smaller model and it didn't converge (attached photo)

so i want to know if there a certain package or certain way to add specified flow BC ( the outer boundaries)

and how the program would interpolate heads with flow ??? will the GMS convert this flux to head and interpolate them


plzzzz help i searched alot and i want to know the problem urgently

thank you in advance


Edited by hadeel3294
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