"Hydrology" means a science that involves the study of the waters of the earth, including the study of the occurrence, circulation, distribution, chemistry or quality of water or its role as a natural agent that causes changes in the earth, and the investigation and collection of data concerning waters in the atmosphere or on the surface or in the interior of the earth, including data regarding the interaction of water with other gases, solids or fluids. The practice of professional hydrology means the performance or offer to perform any hydrologic service or work in which the public welfare or the safeguarding of life, health, environment or property is concerned or involved. "Practice of professional hydrology" includes the collection of hydrological data, consultation, investigation, evaluation, interpretation, planning or inspection relating to a service or work that applies hydrology.
