PART II

The Regulating of the Yangtze River

The regulating of the Yangtze River may be divided as follows:

a. From the deep-water line of the sea to Whangpoo Junction. b. From Whangpoo Junction to Kiangyin. c. From Kiangyin to Wuhu. d. From Wuhu to Tungliu. e. From Tungliu to Wusueh. f. From Wusueh to Hankow.

a. Regulating of the Estuary from Deep-water Line Up to the Junction of Whangpoo

It is a natural law that the obstruction to navigation in all rivers is begun at their mouths, therefore the improvement of any river for navigation must start from the estuary. The Yangtze River is no exception to this rule, therefore to regulate the Yangtze, we must begin by dealing with its estuaries.

The Yangtze has three estuaries, namely: The North Branch lying between the left bank and the Island of Tsungming, the North Channel lying between the Tsungming Island and the Tungsha Banks and the South Channel lying between the Tungsha Banks and the right bank. Henceforth for the sake of convenience I shall call them the North, Middle, and South Channels.

The silting up of a river's mouth is due to the loss of velocity in its current when the water gets into the wide opening at its junction with the sea and causes the silt to deposit there. The remedy is to maintain the velocity of the current by narrowing the mouth of the river so that it equals that of the upper part. In this way the silt is suspended in the water moving on into the deep sea. The narrowing process may be accomplished by walls or training jetties. And thus the silt may be carried by the water into the deepest part of the open sea and before it settles down upon the bottom a returning tide will carry it from the approach into the shallow parts on both sides of the river's mouth. The mouth of a river can be kept clear from deposit of silt by the action and reaction of the ebb and flow tide. The conservancy of an estuary of any river is accomplished by utilizing these natural forces.

In order to regulate the estuary of the Yangtze we have to study the three channels which form its mouth and to find out which of these channels is to be selected as the regulated entrance into the sea. In Mr. Von Heidenstam's proposal for the improvement of the approach of Shanghai Harbor, he recommends two alternatives, viz., either to block up the North and Middle Channels and to leave the South Channel only for the mouth of the Yangtze, or to train the South Channel only and leave the other two alone. For the present, he thinks, perhaps for the sake of economy, the latter scheme would be enough. But the training of the South Channel alone as the approach to Shanghai would leave it in a state of perpetual anxiety as has been apprehended by Mr. Von Heidenstam and other experts, for the main volume of the water of the Yangtze may be diverted into either of the other two channels and leave the Southern one to be silted up at any time. Therefore to make the approach of Shanghai once for all safe and permanent, it is necessary to block up two of the three channels, leaving only one as an approach to the port. This is also the only feasible way of regulating the estuary of the Yangtze.

In our scheme of regulating the Yangtze Estuary I should recommend using the North Channel only and to block the other two. Because the North Channel is the shortest way to the deep-sea line and by using it as the only mouth of the Yangtze, we have on both sides of it more shallow banks to be reclaimed by its silt. Thus the expenditure would be less and the results greater. But this would leave Shanghai in the lurch. Therefore in a coöperative scheme like this I would apply the theory of killing two birds with one stone by using the Middle Channel, since it would suit both of our purposes. The reason for this is because the regulating of the Yangtze Estuary and the securing of a Shanghai approach have different purposes, hence we must consider them differently.

In my project of regulating the Yangtze Estuary I have two aims, namely, to secure a deep channel to the open sea and to save as much silt as possible for the purpose of reclamation of land. The Middle Channel provides three ready receptacles for the deposit of the silt for the formation of new land: the Haimen, the Tsungming, and the Tungsha Banks. Besides these banks there are many hundreds of square miles of shallow bottom which in the course of ten or twenty years will also form land. As remuneration is our first principle we must consider it in every step of our progress. The reclamation of about a thousand square miles of land even in forty not to say twenty years would be ample profit. At the lowest estimate the reclaimed land would be worth twenty dollars per mow. If after ten years five hundred square miles would be ready for cultivation purposes then we would gain a profit of 38,000,000 dollars. Whereas to make an approach by the South Channel the receptacle ground will be on one side only, that is, the Tungsha Banks, while on the right of the approach is the deep Hangchow Bay which would take hundreds of years to fill up, and in the meanwhile half of the silt would be wasted. To Shanghai as a seaport the silt is a curse but to the shallow banks the silt would be a blessing.

Since it is a profitable undertaking to reclaim the above mentioned banks and the neighboring shallows, we can quite well afford to build a double stone wall from the shore end of the Yangtze right out into the deep sea far beyond Shaweishan Island which is a distance of about forty miles. A stone wall from one fathom to five fathoms in height at low-water level would likely not exceed an average cost of two hundred thousand dollars a mile as cheap stone can easily be obtained from the granite islands nearby, in the Chusan Archipelago. A wall of forty miles on each side that is eighty miles in all will cost sixteen million dollars or thereabouts. And considering that 200 or 300 square miles of Haimen, Tsungming, and the Tungsha banks could be converted into arable land within a short time, the expense of building the wall is well justified. Furthermore, the construction of this wall means that there will be a safe and permanent approach for a world port in Shanghai as well as a deep outlet for the Yangtze. See Map V.

The regulating wall on the right side should be built from the junction of the Whangpoo by prolongation of its right jetty describing a gentle curve into the depths of the South Channel and turning toward the opposite side and cutting through the Blockhouse Island into the Middle Channel, then running eastward right into the five-fathom line southeast of Shaweishan Island. The left wall would be a continuation from that of Tsungming at Tsungpaosha Island parallel with the right wall by a distance of about two miles. This wall should curve to a point at or near Drinkwater Point at Tsungming Island, then project into the five-fathom line at the open sea passing by just at the south side of the Shaweishan Island. A glance at the map here attached would be sufficient to show how the future outlet of the Yangtze as well as the future approach of Shanghai should be. The two regulating submerged walls on both sides would be as high as low-water level so as to give a free passage of the water over the top at flood tide. This will serve the purpose of carrying back the silt from the sea when the tide comes in, thus to reclaim the shallow spaces inclosed behind the walls on both sides of the river more quickly than otherwise. The new channel formed by these two parallel walls would likely be deeper than the present South Channel outside the Whangpoo, which is forty to fifty feet deep because the velocity of the current will be greater than the present one, due to the concentration of three channels into one. Furthermore, the depth would be more uniform and stable than at present. Although the regulating walls end at the five-fathom line, the momentum of the current would continue beyond that point, and so would cut into the deep water outside. This would serve the double purpose of draining the Yangtze Estuary as well as keeping open the approach to Shanghai.

b. From Whangpoo Junction to Kiangyin

This part of the channel of the Yangtze River is most irregular and changeable. The widest part is over ten miles while the Kiangyin Narrow is only but three-quarters of a mile. The depth of the channel at the open part is from five to ten fathoms while that of Kiangyin Narrow is twenty fathoms. Judging by the depth of the water at this point a width of one and a half miles must be provided for the channel in order to slow down the current and to give a uniform velocity right along the river. So the two-mile wide channel at Whangpoo Junction has to be tabulated into one mile and a half at Kiangyin. See Map VI.

The north or left embankment commencing at Tsungpao Sha continues with the sea wall and makes a convex curve up to Tsungming Island at a point about six miles northwest from Tsungming city. Then it follows along the shore of Tsungming right up to Mason Point and transversing across the north channel parallel to the north shore at a distance of three or four miles right up to Kinshan Point, thence it cuts across the deep channel which was formed in recent years and curves southwestward to join the shore northeast of Tsingkiang and follows the shore line for a distance of about seven or eight miles, then cuts into the land side to give this part of the river a width of one and a half miles from the fort at the Kiangyin side. This embankment from Tsungpao Sha to Tsingkiang Point opposite Kiangyin fort is about one hundred miles in length.

South of Tsungming Island a part of this embankment and a part of the wall that projects into the sea together inclose a shallow space of about 160 square miles good for reclamation purposes. The other part of the embankment, which runs from Mason Point at the head of Tsungming Island to Tsingkiang shore, incloses another space of about 130 square miles.

The right embankment starts at the end of the left jetty of Whangpoo Junction and, skirting along the Paoshan shore and passing the Blonde Shoal into the deep, crosses the Confucius Channel on into Actaon Shoal and follows the right side of Harvey Channel on to Plover Point. Then it turns northwest across the deep channel into Langshan Flats, thence recrosses the deep channel at Langshan crossing into Johnson Flats, then joins the Pitman King Island, and thence skirts along the shore right into the foot of the hills at Kiangyin forts. This embankment incloses two shallow spaces: one above and the other below Plover Point, together about 160 square miles. Alongside of both of these embankments there are shallow spaces amounting to about 450 square miles, a great part of which having already formed land and a part already appearing in low water. When these spaces are cut off from the moving current the process of reclamation would be made to work more rapidly so it is not extravagant to hope that within the course of twenty years the whole of these 450 square miles would be completely reclaimed and ready for cultivation. The profits from the new lands thus reclaimed would amount to about $29,760,000 if only taken at $20 per mow. The profits from the new lands would be netted from the beginning of the work and would increase every year up to the completion of the reclamation process.

With a profit of $30,000,000 in the course of twenty years before us, it is a worth-while proposition to take up. Now let us see what amount of capital should be invested before the whole project of our reclamation work could be completed. In order to reclaim this 450 square miles of land two hundred miles of embankments have to be built. Part of these projected embankments will be along the shore line, a greater part will be in midstream, and a small part in deep channel. Those along the shore line need not be bothered with except that the concave surface must be protected with stone or concrete work. Those in midstream should be filled up with stone ten feet or less below low-water level just enough to give a resistance to the undercurrent in order to prevent it from running sideward. Thus the main current would follow the line of least resistance and cut the channel, as directed by the rudimental embankment, by its own force. This rudimental embankment would cost less than the sea wall which I estimated at $200,000 per mile. Except at one point, that is, the junction of the North Channel at Mason Point, which has to be blocked up entirely, the cost for which, as has been estimated by experts, would amount to over a million dollars for a distance of two or three miles. Thus the profits accruing from the reclaimed lands would be quite sufficient to pay for the embankments. So far we see that the regulating of the Yangtze from the sea to Kiangyin is a self-paying proposition from the reclamation of land alone, aside from the improvement of the navigation of the Yangtze River.