extending further in an upstream or downstream direction) or by increas- 

 ing the electrical efficiency of the shunt (connecting shunt screen to 

 steel rods driven into the bed of the stream) . 



The use of domestic power lines as the sole source of power 

 (System 1 as described in a previous section) in the operation of elec- 

 tromechanical weirs and traps and electrical barriers has proven to be 

 entirely satisfactory. However, since the requisite 100-percent effec- 

 tiveness of an electrical sea lamprey control device depends upon its 

 uninterrupted operation during the entire sea lamprey spawning run, the 

 use of an automatic starting generator as a standby source of power is 

 recommended. In remote areas, inaccessible to commercial power of any 

 sort, two complete power generating plants (System 3) must be used, each 

 equipped with its own starting batteries and fuel supply. One of these 

 generators must function as the "normal" source of power; while the other 

 is held in readiness as the "standby" source. The normal source generator 

 must deliver 115 volts, single phase, 60 cycle alternating current at 

 power levels determined by the stream width and depth and a number of 

 factors as discussed in Section (6) of the "Summary of Results in 1952". 

 This generator must have such features as manual ("push button") start- 

 ing, individual starting batteries with provision for automatic charging, 

 and a completely independent fuel supply. It is recommended that the 

 Kohler Company Series L21 generating plants or equivalent be used for 

 this application. The standby generator also must deliver 115 volt, single 

 phase, 60 cycle alternating current, and its power capability must be 

 equal to that of the normal source generator. This generating plant must 

 start automatically and transfer the load from the normal source to itself 

 immediately upon failure, for any reason, of the normal source of power. 

 Like the main generator, it must also be equipped with individual start- 

 ing batteries with provision for automatic charging and an independent 

 fuel supply. The Kohler Company Series E21 automatic standby plants or 

 equivalent are recommended for use as emergency sources of power in con- 

 junction with a domestic power line as the normal source in a System 2 

 supply, or with a generating plant as the normal source in a System 3 supply. 



When the electrical weir site is to be located at a distance 

 from the nearest power line, the choice between a System 2 and System 3 

 power supply will be governed by a number of factors. First, the con- 

 struction and maintenance costs of a connecting power line in a System 2 

 installation must be weighed against the costs of a normal source gener- 

 ator which, in a System 3 supply would replace the power line. Where the 

 electrical weir may be expected to require very high levels of power, and 

 consequently a normal source generator of large capacity (over 10 KW), 

 then a System 2 supply would probably be the most economical where the 

 weir site is located up to 2 mile s from the nearest power line. However, 

 where the maximum anticipated power consumption of a weir is 2 KW or less, 

 the installation of a power line over a half-mile long would in general 

 not be economically advantageous and a System 3 supply accordingly would 

 be desirable. Another factor to be considered is accessibility to the 



$0 



