NB_290_19_8 - NB 290-19-8 INV – Release of CEAP Soil Vulnerability Index for Cultivated Cropland 2.0 User Guide and Web Application for NRCS Staff Use
NB 290-19-8 INV – Release of CEAP Soil Vulnerability Index for Cultivated Cropland 2.0 User Guide and Web Application for NRCS Staff Use
National Bulletin: 290-19-8 Date: September 17, 2019 
Subject: INV – Release of CEAP Soil Vulnerability Index for Cultivated Cropland 2.0 User Guide and Web Application for NRCS Staff Use


 
Purpose.   To announce the release of the Conservation Effects Assessment Project (CEAP) Soil Vulnerability Index for Cultivated Cropland (SVI-cc) 2.0 User Guide and Web Application for agency staff use only (FOUO).     
 
Expiration Date.   September 30, 2020   
 
Background.   Since 2009, the 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, CEAP has worked to improve rulesets and access to the most up-to-date enterprise SVI-cc. The resulting improved tool is called SVI-cc 2.0 and is intended to help NRCS staff understand how local and landscape soil limitations impact conservation management choices intended to minimize surface and subsurface loss of excess agricultural chemicals, nutrients, and pathogens into surface and ground water that include drinking water source areas. One goal of the Resource Inventory and Assessment Division (RIAD) is to provide GIS-ready CEAP SVI-cc 2.0 products to NRCS staff for use during conservation planning and State Resource Assessments. The current release web application uses FY 2018 USDA NRCS Detailed Soil Survey Geographic Database (gSSURGO) and FY 2017 Crop Data Layer information. However, when agency infrastructure allows, these products will use current fiscal year soil and cropland data.        
 

Explanation.   In FY 2018, RIAD sought peer review of its CEAP SVI work on cultivated cropland to address best practice use of USDA soil geographic databases for NRCS Conservation Program delivery. Peer review comments were gathered through a survey completed by relevant staff from States and NHQ. The survey assessed the effectiveness of SVI-cc for anticipating/predicting runoff (surface loss) and leaching (subsurface loss) issues related to cultivated cropland management. Comments were received from NRCS staff that included State resource conservationists, state soil scientists, conservationists, and GIS specialists plus NHQ specialists. These peer-review comments and supporting documents were summarized (see Appendix C of the attached SVI-cc 2.0 User Guide) and used to refine SVI-cc 2.0.

The SVI-cc 2.0 Data and Web Application is accessible to all USDA NRCS staff in the Geoportal via eAuthentication and is intended for official use only (FOUO). See SVI-cc 2.0 User Guide Appendix A for Web Application access guidance and Appendix B for a tutorial on web application use. The attached file provides a full copy of the SVI-cc 2.0 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, contact Resource Assessment Branch Leader Daniel Mullarkey at (301) 504-2311.     
 
 

 /s/

MARY PODOLL
Acting Deputy Chief for Soil Science and Resource Assessment  
 
 Attachment: CEAP Soil Vulnerability Index for Cultivated Cropland (SVI-cc) User Guide 2.0 
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