CHAPTER XXIII 



TRANSPORTATION OF THE DEBRIS. CONVEYORS, BARGES, 



ELEVATORS 



THE dredged materials are disposed of in different ways. They 

 can be used for filling lowlands, for regulating the shores of the 

 river or canal alongside the improvement, and when they cannot 

 be utilized in any other way, are dumped into deep waters. In any 

 case the debris must be transported a certain distance, which 

 varies according to the local conditions. There are different means 

 of transporting the dredged materials, depending upon the machine 

 employed and the method of disposing of the debris. Thus, for 

 instance, when the machine used is not of the hopper type, or when 

 the dredge itself does not transport the materials removed from the 

 bottom, the debris is conveyed to the dumping place either by 

 conveyors, pipes, or by means of barges or scows. 



Belt Conveyors. In the description of the low-tower ladder 

 dredge used in the improvement of the Fox River, Wis., given on page 

 86, was illustrated the method of conveying the debris from dredge 

 to land by means of a belt conveyor. This method, which was used 

 many years ago in connection with land dredges at Tabernilla, 

 Panama, under the French Administration, has been very recently 

 introduced in this country for the transportation of the debris 

 removed from the bottom of rivers by means of ladder dredges. 

 This method is so simple that the description of the one given will 

 be more than sufficient to explain it. 



Pipe Conveyors. Another manner of transporting or conveying 

 the debris from the dredge to the nearby lands is by means of pipe 

 conveyors. These are used in connection with the high-tower ladder 

 dredges and with the hydraulic and pneumatic dredges. In the 

 former case the debris descends through the pipe by gravity; in 

 the latter it is under pressure and consequently they can be dis- 

 charged at a point higher than the dredge itself. 



The following description of a pipe conveyor used in connection 



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