72nd SWCS International Annual Conference July 30-August 2, 2017 Madison, WI

1. SVI Evaluation:
Upper Big Walnut Creek

2. Upper Big Walnut Creek

3. North to South Slope Gradient

4. North to South Soil Gradient?
Delaware County Morrow County
Knox County
Licking County

5. Soil Runoff Potential
SVI Classes
Percent Area
using 2-m DEM
Percent Area
using 10-m DEM
Percent Area using
30-m DEM
Low 10 13 16
Moderate 25 33 42
Moderately High 31 34 29
High 34 21 12

6. Soil Leaching Potential
SVI Classes
Percent Area
using 2-m DEM
Percent Area
using 10-m DEM
Percent Area using
30-m DEM
Low 0 0 0
Moderate 0 0 0
Moderately High 84 84 84
High 16 16 16
*Including artificial drainage

7. Key Points
Runoff Potential
• Likely overestimated for current climate
• Could indicate future vulnerability from extreme events
Leaching Potential
• Errors in SSURGO data limit interpretation of results
• Subsurface drainage must be represented in this watershed