09) Groundwater-level change for Smith Valley and Mason Valley, Nevada, 1970-1995, approach 2

This raster dataset represents groundwater-level change from 1970 to 1995 in Smith Valley and Mason Valley, Nevada, calculated using approach 2. For this approach, depth-to-water measurements from 53 monitoring wells, represented as point values, were differenced between 1970 and 1995. Point values of change were interpolated into a raster to calculate valley-wide groundwater-level change. Depth-to-water was measured at the same 53 monitoring wells in 1995, 2006, and 2020. Depth-to-water measurements from 1970 were calculated by interpolating groundwater-level contours and extracting point values at the monitoring well locations. Groundwater-level change was estimated using two methods (approach 1 and 2) to address groundwater-level measurement uncertainty and constrain groundwater-level change estimates.