1963 



1964 



10 12 14 16 18 20 



MARCH 11-14 



MARCH 2 



Figure 2. — Continued 



tion and as mobile instruments to detei-mine cur- 

 rent patterns at any given time under any condi- 

 tion. Data wei'e recorded under tlie follo\Ying 

 conditions : ( 1 ) duiing maximum reservoir draw- 

 down; (2) at sustained minus 13-m. level witli 

 spill; (3) during till-up without spill; (i) at full 

 pool with high spill; and (5) at full pool without 

 spill. The current meters, when used as continuous 

 current recorders, were placed at midchannel sta- 

 tions in the lower, middle, and upper reservoir (I, 

 II, and III, respectively, fig. 1) at a depth of 3 m. 

 When the current meters were used as mojjile in- 



sti-uments, measurements were made at the estab- 

 lished limnological stations. 



LABORATORY ANALYSES 



Laboratory methods for analysis of samples fol- 

 lowed standard methods (American Public Health 

 Association, lOfiO). Quality control measures de- 

 scribed for maintaining reagent normalities of 

 sodium thiosulfate were also instituted and per- 

 formed before each period. Sodium hydroxide, 

 sulfuric acid, and reagents used in the field were 

 checked immediately before each sampling period 

 and renewed when necessary. 



300 



U.S. FISH AND WILDLIFE SERVICE 



