hru_deplcrv (nhru)

PRMS Parameter Name(s): hru_deplcrv

BAGIS-P Model Toolbox: bagis_p_climate_methods.tbx

BAGIS-P Model Name: Hru_Depl_Curve

Required DATABIN Layer(s):

• db_cover_type: Landfire_EVT

Field Name(s):

• hru_deplcrv

Parameter Description: Calculate a snow depletion curve for each zons. Zones whose median elevation is above timber-line, a user-defined value, are assigned a snow depletion curve number of 2. Zones below the timber line are assigned a curve number of 1.

Methods:

• 1. Reclassify evt to tree or no tree: (0-2 → 0; 2-4 → 1). Calculate MAJORITY for each HRU.

  2. Add deplcrv field to ZonalSt_tree table.

  3. Tree table with deplcrv:

     • Add tree field.

     • Make Table View with deplcrv and elev fields.

     • Join tree_view to median_view. Calculate MEDIAN field. Remove Join with elevation. Join tree to timberline.

     • Calculate deplcrv using the following expression:

Dim aValue

IF [ZonalSt_tree.elev] > [grid_zones_v.TIMBER_ELEV] AND [ZonalSt_tree.MAJORITY] = 0 THEN

aValue = 2

Else

aValue = 1

End If

• • • Remove join with deplcrv, creating “Median_View (no join)”.

5. Check Feature Class for TIMBER_ELEV:

• • • If field exists, make integer DEM layer. Calculate MEDIAN elevation table. Convert units to meters.

    • If field does not exist, calculate No timberline field with a value of 1.

    • Merge branch: “Median view (no join)” and “Tree table (no timberline)”

6. Copy field to params table and update parameter value.

BAGIS-P GUI Example: