180 



program, no attempt was made to distribute them according to 

 selected weather conditions. Except for the fact that no 

 cruises were conducted during the passage of major weather 

 disturbances, the coverage of the bay as a whole and of the 

 different seasons, probably gives a reasonable picture of 

 conditions during the 1955-56 season. It is to be expected 

 that during periods of strong westerly winds the surface 

 water may be driven toward shore. Whether or not this is 

 always true of the main mass of water is not certain. It 

 has been observed by the lay of the ship at anchor in 

 various parts of the bay, as well as by drogues at a depth 

 of 15 feet and by current meters at various depths, that 

 waters within a distance of 5 miles from shore frequently 

 take a direction at a considerable angle or even directly 

 opposed to the wind, even though that wind may have been 

 blowing fot many hours. By the inherent limitations of the 

 survey, this and many other fundamental questions relating 

 to winds, waves, and currents remaii^ yet ♦'o be investigated. 



On the earlier cruises, drift cards were released during 

 the course of an ordinary day's work, usually between about 

 9 a.m. and 3 p.m. From some stations cards were recovered 

 during the early morning hours on subsequent days. This was 

 of little consequence as long as velocities were low and the 

 currents were not directed toward the neighboring beaches. 

 However, on the February, March, and April cruises, there 

 was a consistent shoreward pattern of currents as well as an 

 increase in velocities. When it was apparent that a time of 

 drift for bacteria of less than 24 hours might be critical. 



