The aim of the present Thesis is to give insights into new non-binding forms of voluntary work in the field of disaster control, which have become increasingly important over the last few years. By means of a qualitative content analysis and a quantitative online survey, the members of “Team Österreich” (“Team Austria”) and special Facebook pages dealing with floods were questioned. The theoretical basis for this was provided by both sociological modernization and organizational theories. The main research questions were first, how such initiatives are formed, who joins them and with what motivation this is done. Second, it was investigated into which contribution these initiatives make with regard to disaster control and third, what their differences are when compared to formal organizations. Thereby, it emerged that there indeed exist significant differences between formal and informal organizations in the field of catastrophic control, especially with regard to the members socio-demographic characteristics as well as their motivation to do voluntary work. However, one cannot make general assumptions with regard to informal initiatives in the field of disaster control because they greatly differ among themselves, e.g. concerning their structure and social profiles. This Master Thesis was, however, able to shed new light on informal voluntary work. Still, the latter remains a rather unexplored area, and this Thesis might indeed provide an impetus to conduct further research in this field.