the 10-cm mean variation and the tendency for the daily lows to be somewhat 

 higher than for prior years. 

 Combined years 



88. Based on the distribution of the tide heights for I98O through 1983 

 (Figure 32), the tide can be expected to exceed 110 cm for 0.25 percent of the 

 time (110 hr). Likewise, the height can be expected to be less than -80 cm 

 for 0.25 percent of the time (111 hr). 



0.01 0.10 



1.00 10.00 25.00 50.00 7S.00 90.00 



PROBABILITY, PERCENT EQUAL OR GREATER 



99.00 99.90 99.99 



Figure 32. Distribution of hourly tide heights and daily 

 high/low water levels for I98O through I983 



Water Characteristics 



89. The results of daily measurements of surface water temperature, 

 visibility, and density are presented in this section. The summaries rep- 

 resent single observations made near 0700 EST and therefore may not reflect 

 daily average conditions since such characteristics can change rapidly within 

 a 24-hr period. A discussion of 1983 data is followed by a comparison with 

 previous years. 



Water temperature 



90. Present year. Daily sea-surface water temperatures at the seaward 



59 



