The textbook for our online Applied Environmental Statistics course is the 2020 version of Statistical Methods in Water Resources.
It is available from the US Geological Survey in
electronic form (free pdf file) and as a hardback textbook for purchase (< $25 USD).

Reference as:
Helsel, D.R., Hirsch, R.M., Ryberg, K.R., Archfield, S.A., and Gilroy, E.J., 2020, Statistical Methods in Water Resources: U.S. Geological Survey Techniques and Methods, book 4, chapter A3, 458 p.
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