Figure 1. The traveling debris screen and supporting structure. 



DESCRIPTION OF TRAVELING 

 DEBRIS SCREEN 



A diagrammatic sketch of the traveling 

 screen and supporting structure, installed at a 

 stream site for transfer of debris into a holding 

 pond, is shown in Figure 1. Looking somewhat 

 like a conveyor belt on edge, the screen traveled 

 through the water on a 20° angle to the direction 

 of flow, carrying with it the impinged debris 

 into the holding pond (Figure 1). All oper- 

 ating assemblies, with the exception of the 

 screen, were out of the water to simplify and 

 minimize maintenance. 



The structural design, mechanical aspects, 

 and screen support system of the debris screen 

 are described in the following sections. 



Structural Design 



The structural portion of the screen provided 

 the support system for the traveling or mechan- 

 ical members. It included a wire-rope suspen- 

 sion system, the stiffening members and cables, 

 and the endless track. 



Suspension system — To obtain a supporting 

 system for the screen that could be installed 

 readily on a wide channel without need for 

 expensive piers in the water, a wire-rope sus- 

 pension system was used. The main suspension 

 system consisted of two preformed steel cables, 

 16.0 mm in diameter (each 6 strands and com- 

 posed of 19 wires), which supported the 19.5-m 

 long screen (Figure 2). The two ends of the 

 cables were fastened directly onto the concrete 



20 3- cm Pipe- Engine 8 Pumpt Not Shown 



Torpedo Netting 



^^i- 



ELEVATION AT NET 



Figure 2. Elevation view of traveling debris screen. 



