Deriving rivers / streams from the contour lines;

[lubnanajeh]

Hi All,

I couldn’t figure out if there is a way to derive rivers from the contour lines. I tried to convert a contour to dem by using the Create Tin, tin to Raster tools.

Then, I used the following tools in this order:

Fill

Flow direction

Flow accumulation

Raster calculation (setnull ("flowaccumulation",0))

Raster to polyline

But the result not seams correct and it displayed as in the screenshot

What might be the issue here?

 may I need follow another or additional commands

Thanks in advance,

Lubna

[XanderBakker]

The recommended interpolation method for contour lines would be: Topo to Raster—Help | ArcGIS Desktop .

You should also verify the input precision of the contour lines and the pixel size (resolution) you are using. 

Can you post a screenshot zooming in to a problem area of the contour lines and the resulting streams?