52
5
The Second and First Bars should be dredged to
27 and 28 feet respectively.
different.
Some of you may wonder why the se depths are You know that the highest and lowest tides each day are later at Canton than at Hong Kong. The average difference was found to be 3 hours and 52 minutes for high tides, and 5 hours and 15 minutes for low ones.
If a This means that a tidal wave moves up the river. vessel could proceed as fast as the wave moves, it could come up from Hong Kong, keeping always on the crest of the wave. On the other hand, since the tidal wave never moves down stream, a vessel must start from Whampoa before the tide is high at the First, Second and upper end of the Lintin Bars. The channels must consequently be deeper
and deeper as they occur further and further north if a vessel is to be given a proper depth of water at all times and just clear the lower end of the Lintin Bar at
high tide there.
Our
You will doubtless be wondering how many vessels in the world will be prevented from visiting Whampoa when the channels are dredged to the depths mentioned. studies have answered that question. From the data taken from Lloyd's Register it is estimated that only ten percent will be prevented from coming every day. During the spring tides which occur every month this is reduced to
four percent.
Another common question is what vessel tonnage
this indicates. No definite figure can be stated because vessels are built with very great differences in design. The answer has to be a qualified one. At least two vessels exist in the world which are only of about 3,000 net tons capacity which draw too much water ever to come to Whampoa while at least one vessel with a net register of 15,500
tons could come up to Whampoa, even were the channel to
be only 22 feet deep.
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