Predictions and Conclusions 



The results of these investigations pro- 

 vide the basis for predicting effects which 

 the proposed tidal power structures might 

 have on the fisheries of the area. Con- 

 sideration is given first to anticipated 

 changes in oceanographic conditions if 

 the dams are constructed. Changes in 

 environment will then affect distribution. 



behavior, and abundance of fish stocks, 

 and these in turn will affect the economic 

 status of the fisheries in the area. 



OCEANOGRAPHIC EFFECTS OF 



IMPOUNDMENT 



Tides, circulation, and distribution of 



properties have been described in general, 



but only a qualitative evaluation of their 



relation to controlling factors has been 



Periods when Filling Gates (FG) and Emptying Gates(E6) are open 

 FG L J E G 



_j'-o L jto L_ _j FG L -H ^ ® 



"Open'^ ^Open '^ ^ Ope n " ^ 



Open 



1^ 



-p— I — I — I — r — I — I — I — I — r 

 Surface of High Pool 



_l L 



t I I I I I 1 t I I I I I I t — I 1 1 L_J — I t I 



,i,„J 



12 18 



Time in hours 



24 



Figure 18.--DaUy cycle of power-project operations showing the variation in water level for the high pool, low 

 pool, and outside areas. Periods when filling and emptying gates are open are also shown. 



possible. Without a quantitative relation- 

 ship, precise predictions as to what will 

 happen under a new set of controlling 

 factors cannot be made. It should be 

 borne in nnind that the predictions given 

 here can place only approximate limits 

 on the changes anticipated. 



It was instructive to consider pertinent 

 aspects of other areas, e.g., Kennebecasis 

 Bay, Oak Bay, Northumberland Strait, 

 British Columbia inlets, in which certain 

 oceanographic factors bear a degree of 

 similarity to the anticipated conditions 

 in the Quoddy Region. By making simpli- 



fied assumptions about the nature of the 

 mixing process expected under the pro- 

 posed conditions for the Quoddy Region, 

 distribution and accumulation of fresh 

 water in the St. Croix and the Magaguadavic 

 estuaries were computed. Flushing times 

 of the high and low pools were estimated. 



The following gross effects and ten- 

 dencies can be expected in the high amd 

 low pools and in the outside area. Engi- 

 neering details pertinent to the oceano- 

 graphic predictions were supplied by the 

 International Passamaquoddy Engineering 

 Board. 



24 



