Study area boundary derived from 1:1,000,000-scale hydrographic areas and flow systems for the Great Basin carbonate and alluvial aquifer system of Nevada, Utah, and parts of adjacent states
This dataset contains the amalgamation of the hydrographic area (HA) boundaries and 
polygons for the GBCAAS study area. The study area consists of 165 HAs based 
on Great Basin HAs defined by the USGS in 1988 (Harrill and others, 1988; Buto, 2009). 
This dataset does not contain the HA boundaries or geologic details …