The Neversink-Rondout Source Water Mapper (NRSWM) displays the contributing areas to selected production wells as simulated through groundwater-flow modeling and particle tracking coupled with Monte Carlo analysis as described by Corson-Dosch and others (2022). The NRSWM allows user-controlled visualization of the probability that a location contributes recharge to the simulated production wells. The colormap is scaled to the probability that a location contributes recharge to the simulated production wells. A location with a raster pixel value of 1.0 is within the area contributing recharge to a production well in 100% of simulations. A location with a raster pixel value of 0.5 is within the area contributing recharge to a production well in 50% of simulations. A location outside of the color flood is within the area contributing recharge to a production well in 0% of simulations.

The NRSWM presents the following six simulated pumping scenarios that incorporate uncertainty in well pumping rates: 1) base pumping rates (average reported rates for 2009-2016); 2) reported maximum capacity pumping rates; 3) pumping rates scaled by a 25% increase (25% of the range between base and maximum capacity rates) ; 4) pumping rates scaled by a 50% increase (50% of the range between base and maximum capacity rates); 5) pumping rates scaled by a 75% increase (75% of the range between base and maximum capacity rates); and 6) pumping rates varied in a uniform distribution between the base and maximum capacity rates. Each of the six scenarios are displayed as user selectable map layers. The NRSWM has the capability to display the surficial geology map of Finkelstein and others (2022) with the contributing areas. The NRSWM displays the contributing areas on selectable Web-available base maps. For security reasons, well locations are not displayed at the finer map scales.

References

Corson-Dosch, N.T., Fienen, M.N., Finklestein, J.S., Leaf, A.T., White, J.T., Woda, J., and Williams, J.H., 2022, Areas contributing recharge to priority wells in valley-fill aquifers in the Neversink River and Rondout Creek drainage basins, New York: U.S. Geological Survey Scientific Investigations Report 2021–5112, 50 p., https://doi.org/10.3133/sir20215112.

Finkelstein, J.S., Woda, J.C., and Williams, J.H., 2022, Data sources and methods for digital mapping of eight valley-fill aquifer systems in upstate New York: U.S. Geological Survey Scientific Investigations Report 2022–5024, 21 p., https://doi.org/10.3133/sir20225024.

U.S. Geological Survey, 2021, Neversink-Rondout Source Water Mapper: U.S. Geological Survey web page, available at https://ny.water.usgs.gov/maps/neversink/.