26 NOTES ON DOCKS AND DOCK CONSTRUCTION. 



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feet in length), where a channel 23 

 feet deep has been cut to allow of 

 deep-draught vessels laying alongside 

 at low water. 



The north-eastern quay is 1870 

 feet in length, with a depth of 13 feet 

 at low water, and is provided with 

 four groups of landing-stages. 



The entrance locks are parallel, 68 

 feet 10 inches and 45 feet 11 inches 

 wide respectively, with a depth of 

 water over the sills at spring tides 

 varying from 22 feet 6 inches to 28 

 feet 6 inches. 



The area of the floating basin is 

 nearly 30 acres, including the small 

 inner basin, with which it is con- 

 nected; its width 557 feet near the 

 entrance or north end, and 393 feet 

 at the southern end. Close to the 

 locks, however, the width is increased 

 for the purpose of facilitating the 

 movements of long vessels in entering 

 and leaving the basin. The floor of 

 the basin is 1 foot 8 inches below the 

 lock sills, giving a depth of 30 feet 2 

 inches at high spring-tide level. The 

 total length of quays round this basin 

 is 4820 feet. 



The inner basin is 229 feet wide, 

 with 1150 feet of quayage, and is 

 excavated to ordinary low-water 

 level. 



The dry dock is placed at the south 

 end of the floating basin. 



The small-boat basin, which is 

 connected with the inner basin by 

 two locks 125 feet long by 19 feet 8 

 inches wide, has an area of 10 acres, 

 and a total length of wharf wall of 

 5250 feet. This basin extends as far 



