Urban flooding is a widespread problem being addressed by the US National Science Foundation Urban Flooding Open Knowledge Network convergence accelerator project (http://ufokn.com). Advancing understanding and generating the knowledge to better forecast, plan for and mitigate the effects of urban floods should be a team effort. Please join and share your resources (research data and models in HydroShare) with this group, to help assemble and collaboratively integrate information from multiple sources focused on the problems of urban flooding and its impacts within the urban multiplex. Anyone interested in urban flooding research is welcome to join and share resources with this group. This group is part of a set of community resources being assembled by CUAHSI to share and promote collaboration on urban flooding. If you wish to join the CUAHSI urban flooding email list, contact help@cuahsi.org with the subject line “urban flooding.”