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river observation


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Hello everyone,

I m quite new to modflow,using GMS.

My question is about river observations;

I have river in my model which is passing from east to west. Observed flow rate at the east boundary is 100 l/s and at the west boundary 120 l/s.

While simulating this river with one arc, should I enter 20 l/s for observation or 100 for one node at the east and 120 for at the west boundary.

ps.this river should give me the impact of dewatering at the open pit very near to river.

Best Regards

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  • 1 month later...

The river observations in MODFLOW are flow that is the exchange of water between the aquiver and the river. It sounds like you have a gain of 20 l/s between the 2 points on your river. If you believe that this is due to groundwater entering the river then 20 should be the observed flow. Look at the calibration tutorial for more information on observation data.


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