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.

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Watershed Creation

  1. 1. State of Alaska <br />Watershed and Stream Hydrography Enhanced Datasets (AWSHED) Project <br />
  2. 2. Project Background and Details<br />Prior to the completion of this project, the State of Alaska had defined watersheds to the 4th Level sub-basin level. <br />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. <br />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.<br />
  3. 3. The following is a visual illustration of the process of watershed and sub-watershed delineation that took place.<br />
  4. 4. ALASKA REGION (LEVEL 1)<br />
  5. 5. SUB-REGION (LEVEL 2)<br />
  6. 6. BASIN (LEVEL 3)<br />
  7. 7. SUB-BASIN (LEVEL 4)<br />
  8. 8. SUB-BASIN (LEVEL 4)<br />
  9. 9. DELINEATE 5TH LEVEL WATERSHEDS ALONG THE UPLAND CONTOURS FROM THE MOST DOWNSTREAM POINT <br />
  10. 10. REPEAT LAST STEP FOR NEXT WATERSHED<br />
  11. 11. AND REPEAT AGAIN<br />
  12. 12. UNTIL THE SUB-BASIN IS COMPLETELY DIVIDED INTO WATERSHEDS<br />
  13. 13. NOW INPUT ATTRIBUTE DATA<br />4th level <br />HUC No.<br />5th level HUC No.<br />Downstream 5th level HUC No.<br />
  14. 14. NOW DIVIDE THE 5TH LEVEL WATERSHEDS INTO 6TH LEVEL SUB-WATERSHEDS ALONG THE UPLAND CONTOURS FROM THE MOST DOWNSTREAM POINT <br />
  15. 15.
  16. 16.
  17. 17.
  18. 18. UNTIL THE WATERSHED IS COMPLETELY DIVIDED INTO SUB-WATERSHEDS<br />
  19. 19. NOW INPUT ATTRIBUTE DATA FOR THE SUB-WATERSHEDS<br />5th level HUC No.<br />6th level HUC No.<br />
  20. 20. NOW INPUT ATTRIBUTE DATA<br />Downstream 5th level HUC No.<br />
  21. 21. At time of completion over 1000 fully named and numbered watersheds were created and almost 15,000 sub-watersheds.<br />Futher documentation on this project can be found at http://agdc.usgs.gov/hydro/<br />

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