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zero normal velocity gradient

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I would to use "zero normal velocity gradient" condition boundary but I don't know how to assign the fictitious points with SMS 9.2 interface.

Can you help me?

Thank you in advance

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The Zero normal velocity gradient in an option in the Arc/Nodestring Dialog. To create a nodestring in your conceptual model just change your coverage type to an ADCIRC coverage in the Map Module and then create a feature arc. You may double click on the arc or right click and select attribute to bring up this dialog. (http://www.xmswiki.com/index.php?title=SMS:ADCIRC_Boundary_Conditions) You may also manually edit the mesh by creating a nodestring (using the create nodestring tool in the Mesh Module) and ricght click on it and select assign BC to bring up its attributes.

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