Flpw introduction 

 pool 



ExH weir B 



Entry weir 



-Approach pool 



Figure 2.--Location of 0,3- and 0.9-m.. 





Figure 3. — The 82.3-m.-long, 0.6-m. -diameter pipe sys- 

 tem (three sections on left) and the 27.4-m. section of 

 the 0.3-m.-diameter pipe (on the right), 1964. Arrows 

 Indicated direction of flow. Fish entered pipes down- 

 stream of area in foreground and exited upstream of 

 wall In background. Small upright pipe extensions con- 

 tained lamps. 



■diameter pipes, entry and exist pools, and weirs where fish passage was 

 recorded, 1963. 



Illumination 



Illumination in the open pool areas was pro- 

 vided by 1,000-watt mercury-vapor lights, 

 spaced at 1.8-m. intervals and placed 1.8 m, 

 above the water. These lights provided an in- 

 tensity in illumination comparable to that in 

 the main Bonneville fishway on a bright, 

 cloudy day. 



Illumination for the interior of the pipe was 

 provided by 75 -watt flood lamps. The head of 

 the lamp protruded 2.5 cm. into the top of the 

 pipe. In a pipe without water, the flood lamps 

 produced an average light intensity of 321 foot- 

 candles, measured at the bottom of the pipe. 

 The lighting array consisted of 16 units spaced 

 5.2 m. apart in the straight sections of the 

 0.6-m. pipe (fig. 5). 



Release of Fish 



Two methods of release were used--an in- 

 jiividual and a mass release. 



In an individual release, the length and 

 species were ascertained in the release box, 

 from which the fish was released into the 

 approach pool (1963) or introductory pool 

 (1964) of the selected pipe system. Unless 

 otherwise stated, individual releases were 

 made in all tests. 



