USGS Washington Water Science Center
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Figure 1. Location map and surface geology of the Yakima River basin (Vaccaro et al., 2009).
Figure 2. Boundary Conditions used in the existing USGS groundwater model. Red is the Columbia River, orange are surface reservoirs modeled as General Head Boundaries, green are agricultural drains simulated as River Boundaries, dark blue are streams simulated as Drain Boundaries, and light blue are rivers and streams simulated with the Streamflow Routing Package.