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I want to generate hydro network topology on a stream network without calculating catchments and drainage points. My initial data are a Line layer (river network) and a DEM10 and the target is to display the flow direction. Is there a possibility to create a network direct on the Line layer by using the elevation of the DEM ?

best regards Tobi

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If you are asking whether it is possible to get to some of the results without going through all of the steps in the ArcHydro toolset, then I think the answer is yes. You simply won't be able to use the ArcHydro extension. You can use the Hydrology tools in Spatial Analyst to perform the same functions. More detail on your overall goal and project may help you get a better answer. –  Get Spatial Apr 22 '13 at 19:05
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