Rising sea levels contribute to the frequent flooding of Hampton Roads, Virginia. Environmental scientists and activist groups, local to the area, developed a program titled Catch the King, in an effort to document the reach and severity of the flooding. This grassroots crowdsourcing project harnesses the power of volunteers and their smartphones by collecting all of its data through the Sea Level Rise app. On the day of its execution — Nov. 5, 2017 — the program became the largest flood-related crowdsourcing data project in the world. The data gathered during Catch the King is currently being used to improve predictive flood mapping, providing a glimpse into the future of Hampton Roads and surrounding areas, as sea levels continue to rise.