NB_290_22_1 - NB 290-22-1 INV - Release of Conservation Effects Assessment Project (CEAP) Soil Vulnerability Index for Cultivated Cropland (SVI-cc) 3.0 User Guide for NRCS Staff Use
NB 290-22-1 INV - Release of Conservation Effects Assessment Project (CEAP) Soil Vulnerability Index for Cultivated Cropland (SVI-cc) 3.0 User Guide for NRCS Staff Use
National Bulletin: 290-22-1 Date: October 7, 2021
Subject: INV - Release of Conservation Effects Assessment Project (CEAP) Soil Vulnerability Index for Cultivated Cropland (SVI-cc) 3.0 User Guide for NRCS Staff Use


 

Purpose.  To announce the release of CEAP SVI-cc 3.0 User Guide for agency staff use only.

 

Expiration Date.  September 30, 2022

 

Background.  Since 2009, CEAP SVI-cc has shown that it can be a simple, fast screening tool for conservation planners. The tool helps planners “screen” or quickly identify farmers’ fields most vulnerable to losses of sediment, crop nutrients, and pathogens.

Over the past decade, the Resource Inventory and Assessment Division (RIAD) has worked to improve rulesets and access to the most up-to-date enterprise SVI-cc. The resulting improved tool is called SVI-cc 3.0 and is intended to help NRCS staff understand how local and landscape soil limitations impact conservation management choices intended to minimize loss of excess agricultural nutrients, chemicals, and pathogens into surface and ground water (including drinking water source areas). The current release uses FY 2020 USDA NRCS Detailed Soil Survey Geographic Database (gSSURGO) and FY 2019 Crop Data Layer information. When agency infrastructure allows, these products will use current fiscal year soil and cropland data.

 

Explanation.  This User Guide was prepared to document the 3.0 version of the CEAP SVI-cc. In 2021, based in part on results from the 2018 SVI-cc 1.0 peer review and a peer review of the CEAP Conservation Benefits Indicator (CCBI), selected States requested the inclusion of a “karst rule” in the SVI ruleset. This document provides basic information about how the CEAP SVI-cc 3.0 was prepared to include the new “karst rule” and how it can be used. The addition of a “karst rule” is the only change to the SVI-cc 2.0 ruleset. Additional peer review questions dealing with SVI-cc 3.0 will be included as part of the CCBI 2.0 Field Level peer review in 2021.

Web map services for the SVI-cc 3.0 dataset can be found in the Geoportal. See SVI-cc 3.0 User Guide Appendix C for web map service access guidance. Attachment A provides a full copy of the SVI-cc 3.0 User Guide. This updated user guide includes additional background (changes in terminology and rulesets), definitions of terms, data sources, how the SVI-cc was prepared (rulesets), GIS processing steps, methods for estimating acreage, example calculations, citations, and selected references.

 

Contact.  For further information, please contact Resource Assessment Branch Leader Dan Mullarkey at (301) 504-2311 or daniel.mullarkey@usda.gov.

 
 


 /s/

LUIS TUPAS
Deputy Chief for Soil Science and Resource Assessment

      

 
Attachment A - CEAP Soil Vulnerability Index for Cultivated Cropland (SVI-cc) User Guide 3.0
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