728 ECONOMICAL ASPECTS 



Forebay. The forebay is a reinforced concrete structure, 

 30X70 feet and 95 feet deep. The excavation involved some 

 4750 cubic yards of rock and the thickness of the concrete in the 

 walls of the tank varied from 3 to 6 feet. Some 700 tons of steel 

 reinforcement were used. 



The cost of the rock excavation at the forebay was as follows: 



Per Cubic Yard. 



Labor $1 .620 



Explosives . 106 



Transportation . 089 



Liability insurance . 067 



Miscellaneous supplies . 246 



Miscellaneous expenses . 038 



$2.166 



The concrete lining: of the forebay shows the following unit 

 figures : 



Per Cubic Yard. 



Labor $1 . 680 



Cement 1 . 920 



Lumber . 117 



Freight 0.012 



Transportation '. 0.013 



Liabib'ty insurance . 049 



Miscellaneous expenses . 178 



Crushing stone 1 . 569 



Miscellaneous supplies . 033 



$5.571 



The above figures represent the unit cost of the concrete 

 below elevation 1500. The thickness of concrete was so small 

 and the amount of reinforcement so great in comparison with the 

 concrete below elevation 1500 that no unit copper yard was made. 

 The concrete used above elevation 1500 cost $1.925 per superficial 

 square foot surface one side. 



Power-plant Building. The power-plant buildings are con- 

 structed with a concrete substructure and a structural steel frame- 

 work enclosed with full brick walls as a superstructure. The gen- 

 erator building is 186 feet long, 42 feet 3 inches wide and 49 feet 

 high above generator floor. The switch-house is 277 feet long, 

 46 feet wide and 103 feet high. 



There are five vertical reaction turbines operating under an 



