To cite WaterML in publications use:

Jiri Kadlec, Bryn StClair, Daniel P.Ames, Richard A. Gill (2015). WaterML R package for managing ecological experiment data on a CUAHSI HydroServer. Ecological Informatics, 28, 19-28. http://www.sciencedirect.com/science/article/pii/S1574954115000801

Corresponding BibTeX entry:

  @Article{,
    title = {{WaterML} R package for managing ecological experiment
      data on a CUAHSI HydroServer},
    author = {Jiri Kadlec and Bryn StClair and Daniel P. Ames and
      Richard A. Gill},
    journal = {Ecological Informatics},
    year = {2015},
    volume = {28},
    pages = {19--28},
    url =
      {http://www.sciencedirect.com/science/article/pii/S1574954115000801},
    doi = {10.1016/j.ecoinf.2015.05.002},
  }