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Watershed area A watershed can be defined as the area of land that drains to a particular point along a stream. Each stream has its own watershed. Topography is the key element affecting this area of land. The boundary of a watershed is defined by the highest elevations surrounding the stream. A drop of water falling outside of the boundary will drain to another watershed. By Ariani andayani G051060061 Watershed and Stream Network Auto-Delineation with ArcGIS Source: www.dcnr.state.pa.us/brc/rivers/riversconservation/registry/Sewickley_Creek/ watershed def.pdf Objective: - Delineate a watershed area. - Find the streams of the rivers using 3D Analyst
1). Export from SRTM (.hgt) to Geotiff with 3DEM S07E105.Hgt and S07E106.Hgt
2). Load data in ArcGIS
Prosedure & Result
3). Clip data appropiate by available hydrology data boundary with 3D analyst tools Raster Math Minus 4). Remove Error Sink in the DEM a. Convert the DEM to integer with Spatial analyst Raster Calculator b. Remove an error sink with Spatial analyst tool --> Hydrology --> Fill Step 3 Step 4a Step 4b
5). Generate Flow Direction Spatial analyst tool Hydrology Flow Direction Step 5