Iowa Daily Erosion Project (version 2)
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README.md

README.md

idep

Our work is transitioning to use the projection EPSG:5070 for all GIS work, this is the USGS CONUS Albers.

Things to show

  • June 11, 2008 144.12 T/A !

So in review…the mean NRI slope length for all samples in V1 is 60.8m – 95% 198m. when aggregated to townships: max slope length 95% = 311m

To be conservative, I would start at 311m as a flowpath length threshold, then change to 198m to see how they matchup to the NRI results.

Iowa Daily Erosion Project (version 2)

Structure of the /i directory tree

  • cli -- climate files generated from scripts/cligen/
  • env -- erosion output from scripts/RT/proctor.py
  • man -- management files generated by scripts/import/prj2wepp.py
  • prj -- WEPP project files generated by scripts/import/flowpath2prj.py
  • run -- WEPP run files generated by scripts/RT/proctor.py
  • slp -- Slope files generated by scripts/import/prj2wepp.py
  • sol -- Soil files generated by scripts/import/prj2wepp.py
  • sol_input -- input soil files from David James
  • wb -- WEPP output water balance files generated by scripts/RT/proctor.py

    B - Soy F - forest P - Pasture C - Corn R - Other crops D - Soy/Corn T - water U - Urban/developed X - unclassified/clouds

fp07060002 - flowpath number X - X coordinate where sampled (UTM 15N NAD83) Y - Y coordinate where sampled ec3m070600 - elevation (in cm) where sampled fplcm07060 - flowpath length (in cm) GenLU07060 - generalized land use code gSSURGO - soil map unit identifier LU6_070600 - land use string Management - management code

In the dbf file there is a "Management" field with values 1-5. These values correspond to a C factor in IDEP1 management files (the tillage part of the management file) and the correspondence changes based on the crop type since C factors are an indication of the amount of residue on the surface at planting. Higher C factor, higher erosion, lower residue cover.

CCCC - Management 1 = 0.02 2 = 0.03 3 = 0.08 4 = 0.13 5 = 0.17

SSSS Management 1 = 0.02 2 = 0.08 3 = 0.19 4 = 0.30 5 = 0.33

CBCB and BCBC Management 1 = 0.02 2 = 0.05 3 = 0.13 4 = 0.22 5 = 0.25