TIDAL POWER TURNBULL 



531 



" standard " range, and the curves and estimates that follow are 

 based on this range of 32 feet. 



We will now return to the discussion of the principles involved in 

 the proposed plant, and I will ask you to examine the next figure 

 (No. 6) , which shows a tidal cycle at a " standard " range of 32 feet, 

 with an assumed drop in the high-level basin of 6 inches per hour, 

 and the level changes that will occur in the two basins with the opera- 



Fig. 6 



tion of the plant, as before described. If the conditions at Hopewell 

 were better, the ratio of effective areas would be as 2 to 1 for the 

 high and low level reservoirs, but unfortunately this is not the case, 

 for the Petitcodiac contains an effective area of about 330,000,000 

 square feet, while the Memramcook has only about 60,000,000 square 

 feet, so that the ratio is about 5 1 /? to 1 ; thus while the water in the 

 Petitcodiac is dropping 6 inches per hour the water in the Memram- 

 cook is rising five and one-half times this, or 33 inches per hour, and 



