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Is it possible to conduct a flood model analysis with QGIS using a DEM? Need to simulate rising water levels on a 250k map.

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Check out InaSAFE plugin for QGIS inasafe.org/index.html. It can handle different risk assessments - flood models being one of them. – underdark♦ Feb 1 at 7:47

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If it were me, I'd be looking to

http://www.lutraconsulting.co.uk/resources/crayfish/

and the guys who developed it

http://www.lutraconsulting.co.uk/

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to respectfully contrast @underdark's answer and InaSAFE, I suspect you are going to want to produce results related to time and so will need to include Mannings n as a parameter in the model. – Willy Feb 1 at 7:58

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