Phosphorus runoff risk assessment in karstic regions of the U.S.

Agricultural & Environmental Letters
By: , and 



The Phosphorus (P) Index risk assessment tool has been widely adopted across the U.S. to identify and rank site vulnerability to P runoff as part of the Natural Resources Conservation Service (NRCS) nutrient management planning (NMP) process. However, limited success has been achieved in addressing the risk of P loss by subsurface flow pathways, despite its relative importance in certain areas of the U.S., particularly in those States dominated by karst terrain. Here we review how States with varying land areas classified as having karst features address the risk of P runoff during the NMP process. Indices adopted in Illinois and Indiana require setbacks (15 – 72 m widths) around surface karst features. The remaining States with karst, address the risk of P loss in NMP development rather than the application of a P Index. Given the spatially variable hydrogeologic properties of karst, technically rigorous field‐scale factors are unlikely to be developed in the near future.
Publication type Article
Publication Subtype Journal Article
Title Phosphorus runoff risk assessment in karstic regions of the U.S.
Series title Agricultural & Environmental Letters
DOI 10.1002/ael2.20001
Volume 5
Issue 1
Year Published 2019
Language English
Publisher Wiley
Contributing office(s) Lower Mississippi-Gulf Water Science Center
Description e20001, 8 p.
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