of the stationary trash rack plus others such 

 as low construction and maintenance cost, effi- 

 cient deflection of debris, simplicity of design, 

 and ease with which it collects, transports, and 

 releases debris. Its one major disadvantage is 

 the collection of streamers of moss which, as 

 they are carried downstream, become entangled 

 in the cable rings. The accumulation of moss 

 can be rapid and troublesome. 



The debris screen, as described, appears to 

 be practical for canal and river flows of con- 

 siderable magnitude, limited only by the season- 

 al passage of moss. 



LITERATURE CITED 



BATES, D. W., E. W. MURPHEY, and 

 E. F. PRENTICE. 

 1970. Design and operation of a cantile- 



vered traveling fish screen (model V). 



In Preliminary designs of traveling 



screens to collect juvenile fish, p. 6-15. 



U.S. Fish Wildl. Serv., Spec. Sci. Rep. 



Fish. 608. 

 BATES, D. W., and J. G. VANDERWALKER. 

 1970. Traveling screens for collection of 



juvenile salmon (models I and II). In 



Preliminary designs of traveling screens 



to collect juvenile fish, p. 1-5. U.S. 



Fish Wildl. Serv., Spec. Sci. Rep. Fish. 



608. 



GPO 999-438 



