My project in the Luquillo CZO aims to characterize how sediment in the Mameyes river responds to flood events. This involves looking at how the river moves sediment during a flood. Specifically, when does sediment move and what are the characteristic forces and stresses associated with that movement? Since the Mameyes is a gravel bed river, bedload is the dominant mode of sediment transport. To study bedload in the Mameyes, force sensors embedded in rocks will be used to directly measure a grains onset and cessation of motion, the time of flight for transported grains, and the energies involved with intergrain and grain-bed collisions. When coupled with fluid shear stresses derived from stream gauge discharge and a measure of the bulk transport occurring during a flood, this information will allow us to create a high resolution characterization of flood induced course grain motion in the Mameyes.