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The Surface Velocity Workgroup (Surf Board)

"During the past 2–3 years, staff from U.S. Geological Survey (USGS) Water Science Centers, the National Research Program (NRP), and the Office of Surface Water (OSW) began experimenting with and adapting some new surface velocity measurement technologies. Hoping to aid in national coordination, the OSW formed this work group on surface velocity measurements and their applications to Water Mission Area (WMA) programs. The Surface Velocity Workgroup (Surf Board, for short) aims to provide guidance to OSW that will likely lead to policy and procedure guidelines for the deployment and use of surface velocity methods Survey-wide. These novel techniques have a lot of potential to help the USGS move forward with new science. There are also a many pitfalls. A major goal of the Surf Board is to make the path forward clear for the USGS."

Cazadores de Crecidas (Flood Chasers) 

The mountainous rivers of the Córdoba province, Argentina, are characterized by the occurrence of flash floods with very high volumes of fast flows during the rainy season (October to April). Due to the sudden nature of flash floods, it is very unlikely to be able to survey several river sections of interest using instruments and techniques suitable for recording the peak flow and its temporal evolution during the flood. In case it is possible to get in time to the study sites, flow velocities and floating river debris endanger both the instruments and operators. Following this, the researchers of the National University of Córdoba have developed and implemented the Flood Chasers Project (“Cazadores de crecidas” in Spanish) to populate a database of videos and digital photos of flash floods in rivers of the province of Córdoba recorded and shared by citizens using advanced digital technology (cell phones, digital cameras, tablets, etc.) on the basis of the willingness of people filming these extreme hydrological events to share their footage in social networks, websites, forums, etc. Flood movies recorded by citizens are then processed to estimate river flow velocity and discharges using image velocimetry techniques such as Large Scale Particle Image Velocimetry using PIVlab and RIVeR.  During the rainy season , extreme hydrological events occurred in the Cordoba province and in some cases the data obtained with this technique is the only information available to characterize the observed hydrological events. You can follow the Flood Chaser on Twitter.

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