Stream and Watershed Delineation(ArcView Watershed Delineation Tool)

• Acquire Digital Elevation Model (DEM) of study area

• Fill in the pits, compute flow direction and flow accumulation

• Delineate the streams and watersheds

  • threshold = 250 cells = 62.5 km2

• Process the stream coverage

  • identify head and outlet sections
  • remove splits

• Process the watershed coverage

  • dissolve “extra” corner polygons

• Compute additional attributes using TXDOT scripts

  • flow length
  • slope of flow path

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