The few steps that allow you to determine the Watershed of specified region using ARCGIS.

       Watersheds are determined  manually using topography maps or using tools such as ARCGIS and Global Mapper.

The manual method is a complicated and consume a lot of time.

The method using software is easy but you need a high resolution MNT map and the ARCGIS/Global Mapper software.

For ARCGIS you'll need to install ArcHydro and extensions of Arcgis.

Necessitis :

• TOPOGRAPHY MAP(MNT)
• ARCGIS
• ARCHYDRO

Steps follow in Archydro Tool :

       a-      Level DEM
        b-      DEM Reconditioning
        c-      Fill Sinks :
        d-      Flow Direction
        e-      Flow Accumulation
        f-       Stream Definition
        g-      Stream Segmentation
        h-      Catchment Grid Delineation
         i-        Catchement Polygon Processing
         j-        Drainage Line Processing
         k-      Adjoint Catchement Processing
         l-        Drainage Point Processing

Second step:

         a-      Batch Point Generation   
        b-      Batch Watershed Delineation 

Application :

 

Flood prevention

Design of a dam

Design of roads

Hydrology

Water resources management