3-74 



Surface waves of about 8 cm in height have been observed in 

 the boil area as a result of the discharge. They pose no hazard to 

 ships or boats of any kind. 



Water velocities associated with the intake have also been 

 discussed above. The resulting currents are out of the main paths of 

 ships and boats using the harbor and are of insignificant velocity in 

 terms of their effect on navigation. 



In summary, the intake and discharge of cooling water at the 

 maximum design rate: 



1. makes a small contribution to the momentum balance in 

 the inner harbor and a minor addition to the kinetics of 

 the harbor as a whole, and therefore is not expected to 

 have an effect on the large scale circulation patterns. 



2. could result in maximum velocities in the intake channel 

 of 8 cm/sec at low tide and 5 cm/sec at high tide, and 

 cause the peak tidal currents at the westerly end of the 

 intake channel to deviate from their normal direction 

 parallel to the axis of the main channel by less than 20° 

 to the east; this effect decreases rapidly away from the 

 intake channel and is negligible in the main channel of 

 the harbor. 



3. can cause surface currents directed in a narrow band, 

 cross-channel at the discharge location, that are estimated 

 to be from 61 to 91 cm/sec on the easterly edge of the 

 navigation channel, falling to 18 cm/sec near the oppo- 

 site edge of the channel. The cross-sectional areas 

 affected by these currents are small. On rare occasions 

 during the winter, these velocities may occur below the 

 surface (submerged plume) . 



