STATION I 



STATION III 



STATION II 



^^^ Velocity m.p.s. 



Direction % of time 

 ■^- Downstream direction 



RESERVOIR CONDITION 

 Period June 13 to 26, 1964 



Pool status Full pool 



Pool level Full pool 



Inflow 1.185 cms. 



Spill discharge 1.008 c.m.s. 

 Total discharge 1,219 cms 



Figure 13. — Direction (percentage of time, indicated by scale between center and upper margin of each figure) and 

 average velocity (m.p.s., .scale between center and lower margin) of currents recorded at 3-m. depth in Brownlee 

 Reservoir during full pool with spill, June 13 to 20, 19(>4. Direction of current reads toward point of wedge. 



caused measurable currents at station 10 (fig. 17), 

 where readings from top to bottom ranged from 

 0.06 m.p.s. to zero. Velocities at the lower end of 

 tlie reseiToir still remained below 0.15 m.p.s. Gen- 

 erally, most currents at the surface were down- 

 stream and were measurable from station 20 to the 

 dam. 



Full pool with high spiU. — Instantaneous cur- 

 rent measurements were made again on June 24 

 and 25, 1964 (fig. 18), when the r&servoir was at 

 full pool and when the s\)\\\ was 1,049.1 c.m.s. Cur- 

 rents were measurable from station 20 to the dam 

 from the surface to 30.5 m. All readings below 

 38.1 m. were zero in the lower end of the reservoir. 

 Velocities in the upper end of the resen^oir ranged 



from 0.04 to 0.30 m.p.s.; in the lower end of the 

 re.servoir, velocities ranged from 0.00 to 0.14 m.p.s. 

 The maximum of 0.14 m.p.s. in the lower reservoir 

 was at the 22.9-m. depth at station 6. The direction 

 of currents was generally downstream in the upper 

 le\-els throughout the reservoir, but some upstream 

 currents were detected in the lower levels at the 

 upstream end. 



Full pool without spill. — Instantaneous current 

 measurements at full pool without spill began on 

 July 1 and continued through October 1964. All 

 ilata were similar to those for August 18 to 20 

 (fig. 19) . Directions of flow at the time of thermal 

 stratification were erratic: velocities rarely ex- 

 ceeded 0.08 m.p.s. even in the upper reservoir 



LIMNOLOGY OF BROWNLEE RESERVOIR 



323 



