Abstract. Communication about water-induced hazards (such as floods, droughts or levee
breaches) is important, in order to keep their impact as low as possible.
However, sometimes the boundary between specialized and non-specialized
language can be vague. Therefore, a close scrutiny of the use of
hydrological vocabulary by both experts and laypeople is necessary. In this
study, we compare the expert and layperson definitions of 22 common terms and
pictures related to water and water hazards, to see where misunderstandings
might arise both in text and pictures. Our primary objective is to analyze
the degree of agreement between experts and laypeople in their definition of
the used terms. In this way, we hope to contribute to improving the
communication between these groups in the future. Our study was based on a
survey completed by 34 experts and 119 laypeople. Especially concerning the definition of words related to water there are
some profound differences between experts and laypeople: words like “river”
and “river basin” turn out to have a thoroughly different interpretation
between the two groups. Concerning the pictures, there is much more
agreement between the groups.