EXAMPLES OF DOCK PLANS. 



than 26 feet. In the middle of the dock a deep-water berth with 

 28 feet of water has been provided to accommodate ships of a 

 greater draught than 26 feet, which may enter at high tide. 



Calais Harbour and Dock. 1 These works (Fig. 16), constructed 

 from the plans of M. Vetillart, the engineer to the port of Calais, 

 offer a good example of the adaptation of the design to the site. 

 The works consist mainly of an entrance channel confined be- 

 tween jetties, with a sluicing reservoir of 35 acres area at 

 ordinary high water, an outer basin, entrance locks, large 

 floating basin, inner and boat basins, and a large dry dock. 



FIG. 16. 



The sluicing basin (not yet completed), outer basin, entrance 

 locks, and the northern part of the floating basin, are upon the 

 foreshore ; all the excavations were in fine sand, and very special 

 precautions had to be taken to protect the work from the sea. 



The outer basin has an area of about 15 acres, it is enclosed 

 by the north-eastern and south-western quays, which are con- 

 nected by return walls with the entrance locks to the floating 

 basin. The average width of the outer basin is 524 feet, and the 

 depth 11 feet above datum, which is low water of spring tides, 

 except at the foot of the south-west quay (which is about 800 



1 Engineering, vol. xlvii. 



UNIVERSITY 



DEPARTMENT CF 



TORONTO 



t t_ E N G ! N B E R I 



