The understanding of the water and sediments exchanges between the Amazon River and its floodplain is critically important to understand the C and Hydrological cycles. Those exchanges determine the distribution of riparian plants and regulate the complex habitat mosaic of the floodplain. A field campaign was carried out during the high water period, between June 23 and 29, 2006, to measure water depth, flow velocity, and discharge along the inlet and outlet channels of Curuai Lake Floodplain system using a 1.5 MHz Acoustic Doppler Profiler (ADP). During this campaign, in situ radiometric and limnological data were collected and a Landsat/TM5 image was acquired over Lake Curuai. In this work a comparative analysis among ADP results (inlet and outlet discharges) and previous studies is presented. Essentially, we seek to determine channel sensitivity to changes within river-floodplain system by combining remote-sensing and GIS techniques with field-based ground-true methods. The approach to model changes in potential channel sensitivity and volumetric flux of sediment is essential to future sediment budget estimates. The LBA-ECO-LC07 team is aiming to identify these sediment transport issues to understand the spatial and temporal variability of cut-and-fill processes which are the driving physical forces sustaining the ecological health of the floodplain system.