Brown and Caldwell Home Page
Technical Papers RECENT PAPERS    ALL PAPERS      LOG IN

Brown and Caldwell engineers and scientists are technical and thought leaders in the environmental sector. Meet the people who have been advancing innovation for more than 70 years.
Author      Title/Abstract      


Water Quality Thresholds for Lake Tahoe
Author: Elaine Archibald, James Yost, David Ziegler
Date:
NULL

Concern over the declining quality of Lake Tahoe led to the adoption of a compact between Nevada, California, and the federal government that required the Tahoe Regional Planning Agency (TRPA) to adopt a set of environmental thresholds to protect Lake Tahoe. The water quality threshold became the most controversial issue because it became apparent during the study that controls on development would be needed to reverse or halt the deterioration in the lake's water quality. A dissolved inorganic nitrogen budget was developed to determine the relative importance of nitrogen sources and sinks. A model was developed to relate clarity and algal growth in Lake Tahoe to the nitrogen accumulating in the lake. A 25 percent reduction in nitrogen loads will be necessary to restore the lake's algal growth rate and clarity levels to conditions that occurred before the greatest deterioration of the lake began.