(A) 



(B) 



Figure 6. — Introductory pool (foreground) during discharge from shallow (A) and 

 deep (B) orifices. Salmon were released from structure in left foreground. 



Test Procedure 



Test fish entered the laboratory from the 

 fishway and were released into the intro- 

 ductory pool after an observer had deter- 

 mined the size and species of each fish. 

 Fish were released as rapidly as they be- 



came available; thus, several fish may have 

 been in the introductory area at the same 

 time. 



After passing through one of the orifices, 

 test fish proceeded upstream through the 

 transportation channel and crossed the exit 

 weir. We recorded the response to an orifice 



