798 



HANSEN 



[CHAP. 23 



Fig. 29. Height of external surge in the North Sea, December, 1954. The calculated maxi- 

 mum height of the surge east of the line 10 is smaller than 10 cm, east of the line 20 

 is smaller than 20 cm, and east of the line 30 is smaller than 30 cm. 



