other Features 



Aside from the two major changes noted 

 in the test fishway (i.e., width reduction 

 and weir crest modification), the essential 

 components within the laboratory were iden- 

 tical to those of the 1956 experiments (fig. 

 3). There was a large collection pool 24 

 feet by 30 feet by 14 feet into which the 

 fish ascended from the entrance fishway, a 

 5-foot-wide release gate through which the 

 fish passed to enter the introductory pool 

 immediately downstream of the test fishway, 

 and the large, flow introduction pool into 

 which the fish passed after leaving the test 

 area. From this point they continued their 

 movement upstream through the exit fishway 

 cind back into the main Washington shore 

 fishway, thus completing the bypass. 



The collection pool was again equipped 

 with a brail which was used to encourage 

 the fish to exit from this pool. The brail 

 was not employed in all tests, however. 



A standard light condition approximat- 

 ing outdoor conditions on a bright, cloudy 

 day prevailed in all experiments. Light was 



provided by fluorescent, mercury-vapor 

 lamps (1000 watt) spaced at 6-foot intervals 

 and hung 6 feet above the water surface 

 throughout the fishway (fig. 1). 



A continuous record of fish passage 

 during an experiment was transmitted to an 

 operations recorder. An observer pressed 

 a switch button each time a fish passed a 

 particular weir in the fishway, and the 

 observation was simultaneously noted on a 

 revolving time tape within the recorder. 



METHODS 



Experimental Approach 



Essentially, the approach to the 

 determination of capacity was similar to 

 that taken in 1956. Two major factors in- 

 fluencing fishway capacity were to be exam- 

 ined. The first was the maximum number of 

 fish which may enter the fishway per unit 

 time. This we assumed would be governed by 

 (1) fishway width, (2) fishway hydraulics 

 and entrance conditions, and (3) differen- 

 tial reactions amdng the fish with respect 



Entry 

 Tunnel 



Entrance Fishway 



^ North Fishwoy 



Exit Fishway 



) 



Cl 



COLLECTION 

 POOL 



Mesh 

 Borrier ^ 



5' 



Center Wall 



Brail Releose Gote 



f 



Partition Wall 



54' 



55 



Introductory Pool 



56' 57' 



PLAN VIEW 



58' 



59 



FLOW 

 INTRODUCTION 

 POOL 



-—Finger Trop" 



60' 



64 



53,8 



400 



/Center Wa ll partition Woll 



Weir 60 



— 60,8' 



Collection Pool Brail 



^Folse Floor 

 "Release Gate 



Fishway Floor Fromes 



SIDE VIEW 



Figure 3. — Diagiammatic plan and side views of the experimental equipment. 



