The given diagram demonstrates the way of dredging,by which can protect Venice;and the given table makes a comparison between two dredgers.
Overall, the process of dredging is quite simple and requires an elementary equipment;according to the data from the table the coastal and canal dredgers carry out a similar function,however have some differences among their largess.it is interesting to note that method begins with digging mud and ends with dumping.
At the beginning,the pump is went down by hydraulic arms then digged mud by rotating blades, in the next step suction pump, which sucks slurry so that the slurry is carried by large tube afterwards it is evacuated into a shuttle boat then it is drained for cleaning.
As far as information of table is concerned, coastal has longer hull than canal with a difference of 63m and its breadth is doubled than canal’s.This is really clear that bigger drag boat is deeper so as to operate in north sea and the smaller one operates in canal or lagoon.