i 0.20 

 I 

 O.IS 



;= 0.10 

 I « 



.| 0.05 



: °^ 



■■ o 



i§-0.05 

 -0.10 



•^z 



-0.15 



Long-Term Meon Oiurnol Ronge (ft) 

 Golveslon Pleosure Pier 2.17 

 Freeporl Horbor 1 .85 



Sobine Poss 1.85 



Predicted 1.42 



Galveston Pleosure Pier 



1955 



1975 



Figure 7. Historical variation in mean diurnal tidal range. 

 55 



-15 - 



3.0 li I 1 I I ] I I r I I I I I I I I I I I I I I I I I I I I I I I I I I 



1900 1910 1920 1930 1940 1950 I960 1970 1980 

 Yeor 



Figure 8. Variation of annual mean water level, 

 Galveston Channel, Texas. 



' I 1 1 I I ' I I I I I I I 



I I I I r I ] I I I I r I r I I I I I I i 



1900 1910 1920 1930 1940 IS50 I960 1970 1980 

 Year 



Figure 9. Variation of annual mean tidal range, 

 Galveston Channel, Texas. 



18 



