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The Piper diagram not only shows graphically the nature of a given water sample, but also dictates the relationship to other samples. For example, by classifying samples on the Piper diagram, we can identify geologic units with chemically similar water, and define the evolution in water chemistry along the flow path. In Piper diagrams the concentrations are expressed as meq/L.

To construct the Piper diagram, the relative abundance of cations with the %meq/L of Na++K+, Ca2+, and Mg2+ is first plotted on the cation triangle. The relative abundance of Cl-, SO42-, and HCO3-+CO32- is then plotted on the anion triangle. The two data points on the cation and anion triangles are then combined into the quadrilateral field that shows the overall chemical property of the water sample

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17y ago

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