 Citizen science is a growing field of research which allows members of the public to participate in scientific research alongside professional scientists. In the case of hydrology, this can involve collecting data related to water levels or flow rates, or even helping to monitor water quality. Citizen science can be used to supplement existing data sets, providing additional information about specific areas or phenomena. Additionally, it can help to increase public awareness of environmental issues and provide a platform for engaging citizens in the scientific process. This article was authored by Wouter E. Bytart, Wouter E. Bytart, Wouter E. Bytart, and others.