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Watershed Creation

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A Video Demonstration of the process involved for Watershed Delineation while working for the Bureau of Land Management in Alaska.

A Video Demonstration of the process involved for Watershed Delineation while working for the Bureau of Land Management in Alaska.

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  • 1. State of Alaska
    Watershed and Stream Hydrography Enhanced Datasets (AWSHED) Project
  • 2. Project Background and Details
    Prior to the completion of this project, the State of Alaska had defined watersheds to the 4th Level sub-basin level.
    The Alaska Geospatial Data Committee (AGDC) and the Alaska state government expressed a need to further refine this scale to a watershed (5th level) and sub-watershed (6th level) system.
    These Watersheds and sub-watersheds would be Delineated and certified into the national Watershed Boundary Dataset (WBD), thus leading to Increased capabilities for watershed modeling and sharing of aquatic resources information in Alaska.
  • 3. The following is a visual illustration of the process of watershed and sub-watershed delineation that took place.
  • 4. ALASKA REGION (LEVEL 1)
  • 5. SUB-REGION (LEVEL 2)
  • 6. BASIN (LEVEL 3)
  • 7. SUB-BASIN (LEVEL 4)
  • 8. SUB-BASIN (LEVEL 4)
  • 9. DELINEATE 5TH LEVEL WATERSHEDS ALONG THE UPLAND CONTOURS FROM THE MOST DOWNSTREAM POINT
  • 10. REPEAT LAST STEP FOR NEXT WATERSHED
  • 11. AND REPEAT AGAIN
  • 12. UNTIL THE SUB-BASIN IS COMPLETELY DIVIDED INTO WATERSHEDS
  • 13. NOW INPUT ATTRIBUTE DATA
    4th level
    HUC No.
    5th level HUC No.
    Downstream 5th level HUC No.
  • 14. NOW DIVIDE THE 5TH LEVEL WATERSHEDS INTO 6TH LEVEL SUB-WATERSHEDS ALONG THE UPLAND CONTOURS FROM THE MOST DOWNSTREAM POINT
  • 15.
  • 16.
  • 17.
  • 18. UNTIL THE WATERSHED IS COMPLETELY DIVIDED INTO SUB-WATERSHEDS
  • 19. NOW INPUT ATTRIBUTE DATA FOR THE SUB-WATERSHEDS
    5th level HUC No.
    6th level HUC No.
  • 20. NOW INPUT ATTRIBUTE DATA
    Downstream 5th level HUC No.
  • 21. At time of completion over 1000 fully named and numbered watersheds were created and almost 15,000 sub-watersheds.
    Futher documentation on this project can be found at http://agdc.usgs.gov/hydro/