Mapping the Soil Vulnerability Index across broad spatial extents to guide conservation efforts

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Figure 1
(a) Dominant soil runoff potential, and (b) dominant soil leaching potential in Iowa, United States, with landforms delineated (Prior 1991), as well as (c) an illustration of inconsistencies in dominant soil runoff potential among Iowa counties.
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Figure 2
(a and c) Dominant soil runoff potential and (b and d) dominant soil leaching potential at the (a and b) HUC8 and (c and d) HUC12 level.
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Figure 3
An illustration of how Soil Vulnerability Index (SVI) data can be used across HUC8 and HUC12 watersheds as well as individual fields in Iowa, United States.

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Table 1
Soil vulnerability index (SVI) criteria for surface runoff potential and leaching potential (adapted from Thompson et al. [2020]).
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Table 2
Dominant and most limiting soil runoff and leaching potential by field (of 366,636 total), HUC12 (of 1,615 total), HUC8 (of 56 total), hectares, and acres in Iowa, United States, categorized by the Soil Vulnerability Index (SVI).