STATION I 



STATION III 



STATION II 



■^^^ Veloci ty m.p.s. 



Directjon °,o of time 

 "^B" Downstream direction 



RESERVOIR CONDITION 

 Period May 30 to June 5, 1964 



Pool status Filling 



Pool level 10.1 to 4.8 



Inflow 646c. m.s. 



Spill discharge No spill c.m.s. 

 Total discharge 221 c.m.s. 



Figure 12. — Direction Cijercentage of time, indicated by scale between center and upper margin of each fi.eure) and 

 average vel<K-ity (m.p.s.. scale between center and lower margin) of currents recorded at 3-m. depth in Brownlee 

 Re.servo!ir during filling with no .spill. May 30 to June 5, 1964. Direction of current reads toward point of wedge. 



this infomiatioa might later help us to under- 

 stand the movement of juvenile salmonids. 



As in the continuous current measurements, the 

 instantaneous current measurements were made of 

 maximum drawdown, fill-up with no spill, sus- 

 tained minus 13.-i-m. level with spill, full pool with 

 high .spill, and full pool without spill. The effect 

 of wind on the currents was measured also. 



Maximiuih drawdoion. — Measurable currents 

 were evident from surface to bottom at most sta- 

 tions throughout the reservoir during maximum 

 drawdown in March 1964: (fig. 15). Velocities 

 varied from 0.08 to 0.51 m.p.s. in the upper end of 

 the reservoir and from 0.00 to 0.15 m.i).s. in the 

 lower end. The direction i)attern of surface cur- 



rents was generally downstream, but some uj)- 

 stream currents were recorded below the surface. 



FRl-up loith no spill. — Few currents were de- 

 tectable at the greater depths from station 10 

 downstream during fill-up in April 1964 at the 

 minus 20.4-m. level (fig. 16). All readings at sta- 

 tion 10 (midreservoir) were zero. Temperature 

 data at this time indicated the start, of vertical 

 stratification. All readings in the lower cud of the 

 reservoir were less than 0.15 m.p.s. 



Sustained minus 13^-m.. level tcith spill. — Veloc- 

 ity and direction were recorded in April at the 

 minus 13.4-m. level when the spillway discharge 

 was about 141.6 c.m.s. and when inflow was about 

 991.:i c.m.s. This minimal spill and increased inflow 



322 



U.S. FISH AND WILDLIFE SERVICE 



