How to get location of upstream and down stream in Arcmap 2010?

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Please help me !

Now i am building mekong river system in Mekong Delta VietNamese. I want to know what the river come in to this river and this river come what the river. All of them is contented in only one layer.

I done axtract river start to point after that i overlapping this point layer into the river layer but result i got that the same river which i axtract point.

Are there any way to do that ? Do you know ? Help me.

Thank so much.



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