Chan C.,University of Louisville |
Jacobs R.R.,Watershed Management Branch
Integrated Environmental Assessment and Management | Year: 2013
Human exposure to Hg through fish consumption from local waterways is an ongoing concern to regulatory decision makers. Previously described population exposure and bioaccumulation models were combined to analyze the impact of potential policies on susceptible populations. The combined model simulated the problem of Hg exposure by examining the system from the point of Hg in the water column to its concentration in population biomarkers. Evaluated policy scenarios included the protectiveness of fish consumption advisories, total maximum daily load changes, and watershed management strategies. Simulations indicated that the characteristics of a basin combined with the unique pattern of intake rates of susceptible populations determine the risk associated with fish consumption from a given waterway. Each population had a unique pattern of biomarker response to changes in fish tissue Hg. Management strategies that lowered bioaccumulation rates also reduced ecosystem services. Reducing fish tissue contamination through reductions in Hg loading to watersheds is a long-term solution. For the short-term, fish consumption advisories should be used to protect populations from adverse exposures. The combination of characteristics of the basin and the populations that fish from the waterway should be the determinant for setting advisories. © 2012 SETAC.
Blair R.J.,Watershed Management Branch |
Carigan E.D.,Watershed Management Branch |
Currens J.C.,Water Resources Section |
O'dell P.W.,Watershed Management Branch |
Seay J.E.,Watershed Management Branch
Carbonates and Evaporites | Year: 2012
The US Geological Survey's (USGS) National Hydrography Dataset (NHD) is a comprehensive set of digital spatial data representing the surface water of the United States for use with geographic information systems (GIS). The NHD digital product was designed to also allow incorporation of various groundwater data. The Kentucky Geological Survey (KGS) and Kentucky Division of Water (KDOW) have compiled and digitized karst flow data for more than half of the karst regions in Kentucky. These data, obtained from many investigators, have been published by KGS in the Kentucky Karst Atlas Map series and are available as data files for use with GIS. The USGS and KDOWhave funded a pilot study, conducted by KDOW, to integrate existing karst data into the NHD. The pilot study area, located in the southwestern Mississippian Plateau Region of Kentucky, is the West Fork Red River watershed. This area was chosen because quality data have been compiled and digitized for a large percentage of the study area. During the project period the USGS created a standard protocol to request updates for all NHD stewards, which allowed for a uniform and streamlined process. © 2012 Springer-Verlag.