Kratzer and Brezonik's (1981) report illustrates that for nitrogen-limited lakes, similar to many of the Florida lakes, the use of trophic state indices (TSI), which assume or imply that there is a constant relationship between Secchi disk depth (SD) or total phosphorus (TP) and chlorophyll a (CHA), can lead to erroneous conclusions. However, I find fault with their procedure of averaging the lesser of a TP TSI and total nitrogen (TN) TSI with a SD TSI and CHA TSI to compute an

No abstract

This report is an element of the comprehensive body of information developed as part of the NAWQA Program. The program depends heavily on the advice, cooperation, and information from many Federal, State, interstate, Tribal, and local agencies and the public. The assistance and suggestions of all are greatly appreciated.

Graphs showing VS2DH modeling results for the Newman site, including simulated temperatures, measures of bias, and associated root mean-square error for observed temperatures at 0.5 foot below the streambed, 1.0 foot below the streambed, 1.5 feet below the streambed, and 3.0 feet below the streambed ..........44 33. Graphs showing VS2DH modeling results for the Crows Landing site, including simulated temperatures, measures of bias, and associated root mean-square error for observed temperatures at 0.5 foot below the streambed, 1.0 feet below the streambed, 1.5 feet below the streambed, and 3.0 feet below the streambed ................45 34. Graphs showing VS2DH modeling results for the Vernalis site, including simulated temperatures, measures of bias, and associated root mean-square error for observed temperatures at 0.5 foot below the streambed, 1.0 feet below the streambed, 1.5 feet below the streambed, and 3.