pool inside the facility. From this point 

 they are released into the experimental area 

 where their movements are observed and re- 

 corded. They then pass into a large upper 

 pool (flow introduction pool) and leave this 

 area by means of an exit fishway which again 

 joins the main ladder. A unique feature of 

 the present experiments is that the fish are 

 never bandied or removed from their fishway 

 environment. 



Assembly and Dimensions of 

 Experimental Fishway 



The established width of experimental 

 fishways in the Bonneville facility is 

 11 1/2 feet. To reduce the number of fish 

 necessary to demonstrate c«ipacity, the orig- 

 inal fishway width was cut to 6 feet by 

 installing a partition approximately in the 

 middle of the fishway (figure 1). This 

 created an experiaiental area comprised of 

 six pools, each 16 feet long (weir center 



to weir center), 6 feet wide, and with an 

 average depth of 6.3 feet. There was a one 

 foot rise between pools (1:16 slope). Total 

 length of the fishway was 96 feet. Weirs 

 were 6 feet high and 7 1/2 inches thick. 

 Weir crests were square and painted white 

 to aid in the observation of fish during 

 turbid water periods. All other structures 

 were painted camouflage brown. There were 

 no orifices in the weirs although small 

 drains (closed during tests) were provided. 

 A cross section view of a weir is shown in 

 figure 2. Diagrammatic pi tin and side views 

 of the experimental fishway are given in 



WOOD 



WOOD 



CONCRETE 



I 





^ 





6.0' 



64i" 



37" 



i i i i 



FIGURE 1 .-- INSTALLING PARTITION WALL TO CREATE 

 A 6-FOOT WIDE FISHWAY FOR THE CAPACITy TESTS, 



FIGURE 2. --CROSS SECTION OF WEIR USED IN TEST 

 FISHWAY. 



