Calculate River flow direction,Flow accumulation and Create river polyline using DEM in ArcGIS.

The Hydrology tools are used to model the flow of water across a surface.
Information about the shape of the earth's surface is useful for many fields, such as regional planning, agriculture, and forestry. These fields require an understanding of how water flows across an area and how changes in that area may affect that flow.

When modeling the flow of water, you may want to know where the water came from and where it is going. The following topics explain how to use the hydrologic analysis functions to help model the movement of water across a surface, the concepts and key terms regarding drainage systems and surface processes, how the tools can be used to extract hydrologic information from a digital elevation model (DEM), and sample hydrologic analysis applications.

[sirajgonj]

Thanks for very helpful tutorial . How can add or get water depth in watershed by ArcGis? l