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									Loading Data into ArcHydro
Computing Basin Characteristics




U.S. Department of the Interior
U.S. Geological Survey
Directory Structure




 StreamStats Data Prep Workshop Oct 21-22, 2003   Page 5-2
  Aggregation of Upstream
   Basin Characteristics
• We need methods to account for the basin
  characteristics of upstream HUCs.
• Types of aggregation:
  –   Sum (drainage area)
  –   Area-weighted average (mean slope)
  –   Maximum (Max elev)
  –   Minimum (Min elev)
  –   Relief (Max – Min elev )


           StreamStats Data Prep Workshop Oct 21-22, 2003   Page 5-3
 Basin characteristic layers
• These are grids that are used to
  compute basin characteristics
• Continuous-surface
  – Mean-annual precipitation
  – Elevation (dem)
• Categorical
  – Forested area
  – Lake/pond
        StreamStats Data Prep Workshop Oct 21-22, 2003   Page 5-4
Add a new data frame (map)




     StreamStats Data Prep Workshop Oct 21-22, 2003   Page 5-5
Run GetParameters




 StreamStats Data Prep Workshop Oct 21-22, 2003   Page 5-6
  What about adding basin
     characteristics?
• Currently this requires programming
  in VB and ArcObjects, using the
  APFramework
• Eventually this will be streamlined so
  that a user can add simple
  characteristics in XML


        StreamStats Data Prep Workshop Oct 21-22, 2003   Page 5-7
                   Caveats

• Make sure your basin characteristics
  are comparable to those that were
  used in the regression studies
• Be wary of projection changes that
  may affect directional characteristics
• Be wary of resolution changes that
  may affect basin characteristics

        StreamStats Data Prep Workshop Oct 21-22, 2003   Page 5-8

								
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