/ " 



1 



Figure 9. Electrical barrier installed in Hibbards' Creek in 1952. 



The submerged lateral electrode was formed of sections of 

 1-1/2 inch standard galvanized pipe strung on a length of l/U-inch 

 diameter wire rope. These sections were connected by means of flex- 

 ible wire "jumpers", the end section functioning as one terminal of 

 the weir. Tests were performed with this lateral electrode located 

 either h feet or 8 feet downstream from the suspended elements. 



At the site of this structure, Hibbards 1 Creek was hO feet 

 wide and varied from 23 to 28-1/2 inches in average depth during the 

 test period. The array was installed directly across the stream at 

 a 90-degree angle to the direction of flow. No trapping mechanism was 

 installed with this device. It was tested solely as a barrier to 

 lamprey and fish migrations, hj 



h/ The mechanical structure of the Hibbards' Creek electrical barrier 

 and that of the Carp Creek electrical barrier which is described subse- 

 quently is very similar to that of certain electric fish screens manu- 

 factured by the Burkey Electric Fish Screen Company of Hollywood, Cal- 

 ifornia. 



13 



