The purpose of this task is to assess the transport of sediment and selenium within the SLD by conducting annual measurements of sediment quantity. Three estimates have been made of the sediment in the SLD. These surveys were performed by the USBR in January 1985, by Summers Engineering for the GWD District in March 1987 and by the SLD-MWA in August 1995. Each was performed using a slightly different method of determining sediment volume.