716 



ECONOMICAL ASPECTS 



The different items cover: 



1. Dam and forebay, including connecting flumes or tunnels 

 and all preliminary de-watering, excavation, concrete, masonry 

 and sluicing. 



2. Penstocks and valves. 



3. Generating machinery, including turbines with governors 



Dam & Forebay Penstocks Machinery Building's Eng'g. Interest Etc. 



D 15.1 



a 



a 



Total 

 88.50 



54.30 



111.50 



79.00 



FIG. 405. Diagram Showing Cost in Dollars per Kw. of Modern Hydro- 

 Electric Plants. 



Plant A 

 Plant B 

 Plant C 

 Plant D 

 Plant E (est.) 



60,000 kw. 

 18,000 kw. 

 30,000 kw. 

 2,500 kw. 

 30,000 kw. 



600 ft, head 

 90 ft. head 



164ft. head 

 60 ft. head 



100 ft. head 



and regulating gates, generators including exciters, transformers, 

 switch gear. 



4. Building for power-house, switch-house, tailrace, etc. 



5. Engineering, interest, contingencies. 



ESTIMATES OF COST OF HYDRO-ELECTRIC DEVELOPMENTS 



Pages 717 to 723 contain, in considerable detail, the cost 

 of construction and operation of several water-power projects as 

 contained in Bulletin 5, prepared by' the State Engineer's Office 

 of Oregon. 



The unit prices used in the estimates of cost were determined as 

 follows: 



Concrete. Proportions for massive concrete: One part Port- 

 land cement, two and one-half parts sand, five parts broken 

 stone of size corresponding to gravel, and two and one-half parts 

 broken stone corresponding to cobblestone size. For canal lining 

 and other thin concrete the larger size will not be used. 



