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This is an Open Access book chapter distributed under the terms of the Creative Commons Attribution Licence (CC BY-NC-ND 4.0), which permits copying and redistribution for non-commercial purposes with no derivatives, provided the original work is properly cited (https://creativecommons.org/licenses/by-nc-nd/4.0/). This does not affect the rights licensed or assigned from any third party in this book. The chapter is from the book Assessment of Treatment Plant Performance and Water Quality Data: A Guide for Students, Researchers and Practitioners, Marcos von Sperling, Matthew E. Verbyla and Sílvia M. A. C. Oliveira (Authors).

This chapter shows you how to build and interpret the main types of graphs and charts used for describing your monitoring data. Most of the graphs are for quantitative data, but charts for qualitative data are also covered. The graphs included are time series, frequency histograms, frequency polygons, percentile graphs, box plots, and scatter plots for quantitative data and bar/column charts and pie charts for qualitative data. Advice on the presentation of graphs is provided.

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