Generates Drainage Networks

I would like to create drainage network from an  integer DTM input.                   

 

 

Following the steps:

 

 

 

Fill - Fills sinks in a surface raster to remove small imperfections in the data.

 

Flow Direction - Creates a raster of flow direction from each cell to its steepest downslope neighbor.

 

Flow Accumulation - Creates a raster of accumulated flow into each cell. A weight factor can optionally be applied.

 

 

Corrected the mistakes of the DTM , need to extract the drainage network