Reclamation Information Sharing Environment (RISE)

The University of Nevada, Las Vegas (UNLV), on behalf of Reclamation, completed a tracer study at Lake Arrowhead using Rhodamine WT (RWT) and sucralose as tracers. The tracers were added to the Lake on December 3, 2019. Masses of 3.9 kg each of RWT and sucralose (a value sufficient to provide a completely-mixed concentration of 0.1 ppb, the practical detection limit) were mixed with ambient lake water, diluted with additional lake water, and pumped into the lake through a diffuser at a depth of 10 meters. RWT concentrations were monitored in situ with depth-profiling fluorometric datalogging probes, and sucralose samples were collected with Van Dorn bottles at RWT peak concentration depths over the next 4 days. RWT profiles were checked against station names (if there were file naming errors) and probe failure (either no reading of depth or RWT). All probes were calibrated using diluted Turner Designs standards. Profiles that showed inaccurate depths given the monitoring station were not used in the hydrodynamic model validation. Sucralose samples were analyzed in the University of Nevada, Las Vegas laboratory. Methodology for the sucralose laboratory analysis is included in this file upload.