372 NOTES ON DOCKS AND DOCK CONSTRUCTION. 



Dunkirk. Dredging by bucket-dredger inside the harbour 

 and in the basins carried out departmentally, and transported 

 a distance of three miles, cost, including all expenses except 

 interest and depreciation on plant 



Dredging 1'93^ = 3 - 93 pcnco per cubic yard 



Transport 2'OOJ of material dredged. 1 



Dredging in the sea channel departmentally with sand- 

 pump hopper-dredgers, and conveying a distance of about 2J 

 miles to sea, cost, including all charges except interest and 

 depreciation, T46 pence per cubic yard of material dredged. 



This rate, which is an exceptionally low one, is apportioned 

 as follows : 



Pence per Pence per 



cubic yard. cubic yard. 



DREDGING Wages 0-527 TRANSPORT Wages 0216 



Coal 0-264 Coal O'llO 



Oil and sundries 0'184 Oil and sundries 0025 



Repairs ... 0'055 Repairs ... 0'066 



1-030 0-426 



Total ... 1'456 per cubic yard. 5 



The percentage of cost being 



Per cent. Per cent. 



DREDGING Wages 51-16 TRANSPORT Wages 50'70 



Coal 2563 Coal 27'91 



Oil, etc. ... 17-86 Oil, etc. ... 5-87 



Repairs ... 5'33 Repairs ... 15*50 



99-98 



Or, for dredging and transport together 



Per cont. 



Wages 51-03 



Coal 26-30 



Oil and stores 14-35 



Repairs 8-31 



99-99 



Dredging in silt with a grab-dredger, and loading into 

 a hopper-barge, cost from 5 '82 pence to 11*65 pence, average 

 8|d per cubic yard, including all charges except interest and 

 depreciation. 8 



Tees. 4 Average cost of dredging with bucket-ladder dredger 

 in sand, silt, and clay, with stones and boulders weighing from 

 6 cwt. to 1 ton, removing three miles to sea in hopper-barges 



1 M.PJ.C.E., vol. Ixxxix. p. 76. Ibid., pp. SO, 82. 



1 Ibid., p. 74. Ibid., vol. Ixxv. p. 243. 



