0.50 



0.40 



- 0.30 



c 0.20 



o 

 cc 



S 0.10 



Z 







3 

 C 



•^ -0.10 



</> 



1 -0.20 

 S -0.30 

 i -0.40 

 f -0.50 



C 



o 



^ -0.60 

 -0.70 

 -0,80 

 -0.90 



Symbol 



Stofion 



Freeporf (SWG) 

 Freeport (NOS) 

 Son Luis Poss 

 Chocolote Boyou 

 Galvesfon South Jetty 

 Sabine Pass (NOS) 



Meon Range (ft) 



1.78 (without Apr., May) 



1.80 (without Apr., May) 



1.62 (without Jon.) 



1.05 



1 .9 I (without June) 



1.83 



Galvesfon Pleasure Pier 2.18 



Jan. Feb. Mar. Apr. Moy June July Aug. Sept. Oct. Nov. Dec. 

 Figure 5. Upper Texas coast monthly mean tidal range variability. 



1974. 



1.00 

 Ir 0-75 



• • 0.50 



—I —I 



» = 0.25 



"O o 



•- S 



g E 



o o. -0.25 



^ -0.50 



-0.75 



— 



-\ 1 1 1 1 1 1 1 1 1 1— 



Long-Term Meon Wolef Level (ft 

 Galveston Pleosurt Pitr 

 Freeporl Harbor 

 Sabine Poss 

 Relolive Sea Level Rise, 1960-1975 (It) 



Golveslon Pleasure Pier 0.72 



Freeporf Horbor 1.15 



Soblne Pass 0.82 



_i — J 1 — 1.1 1 1 p 1 1 1 



— 1 1 — 



above NG\ 



0.36 

 -0.02 



0.75 



m 



"nS- 





<: 





Golveslon Pleo 



sure Pier - 



V 



dienglh) - 

 1 



Sobine Pass (m 



1 1 1 1 1 



1955 



1960 



1965 

 Year 



1970 



1975 



Figure 6. Historical variation in mean water level. 



17 



