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Home > Using Geologic Maps > Reading Significant Sand and Gravel Aquifer Maps > Figure 1



Figure 1. Portion of the Gray quadrangle, Significant Sand and Gravel Aquifer map series. The orange area is a high-yield zone (>50 gpm) and the yellow areas are moderate-yield zones (10-50 gpm). Read the map explanation (pdf) for a more detailed description of the map units.


Last updated on October 6, 2005