Communications and transit > Enquiry on national public works

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pool of this lock is the same as in the upper pool of the Shaopai lock. The maximum lift
of the Huaiyin lock is therefore 9.2 metres. The clear width and length and navigation
depth of the Huaiyin lock will be the same as for Shaopai lock, but the freeboard will
be 1 metre above high-water level. The depth of the chamber will be 12.7 metres. The
other arrangements to be made will be similar to those for the Shaopai lock. The
estimated cost of the Huaiyin lock is about 400,000 dollars.
3. Excavation of Shaopai and Huaiyin Main Channels and Repair of West Dyke of
the Inner Grand Canal.—The length of the main channel of Shaopai lock is 800 metres,
and that of Huayin lock is 1,700 metres. The width of the bottom of these main channels,
within one kilometre of the lock is 40 metres for the anchorage of ships and outside of
this reach it will be 20 metres. In order to maintain the raised pool of the Inner Grand
Canal, the openings and culverts in the west dyke should be closed or repaired, while the
dyke of low sections will be raised and enlarged to the required size. The estimated
costs of the earthwork of the main channels and the repair of the west dyke total about
450,000 dollars.
4. Repair of Weichi Chai.—The Weichi Chai is situated south east of Matou Chen.
It was one of the sluices formerly built for controlling the Hungtze Take water entering
into the Inner Grand Canal, but has been out of use for several decades. It will now be
utilised again as a sluice for regulating admission of navigation and irrigation waters to
the Inner Grand Canal. The structure of this sluice was surveyed and examined care¬
fully in the summer of 1932. The old masonry of the abutments and the wing walls are
still in good condition and require only minor repairs. Some stop-logs or a lift gate
should be added to form a sluice. The estimated cost of repairing Weichi Chai is about
50,000 dollars.
5. Chiangpa Regulator.—The regulator will be composed of 86 movable steel gates
of “ stoney ” system, sliding in grooves in concrete piers. The bottom floor will be made
of concrete slabs with paved rip rap at both the entrance and exit ends. The clear opening
of each sluice section will be 5 metres high and 7 metres wide. The sill of the opening
will be placed at an elevation of 8 metres. There will be also a highway bridge crossing
the tops of the piers. The estimated cost of one opening of the regulator is 41,840 dollars
and the total cost of 86 openings is about 3,600,000 dollars.
The regulator will be situated on the high land of San Ho Tou, near Chiangpa, where
the soil is very suitable for foundation works. The sill of the regulator will be placed
at an elevation of 8 metres; the earth at the site of the regulator will be excavated to a
depth of 7 metres, for the arrangement of foundation works. The bottom of the main
channel below the regulator site will be excavated to a depth of 6.5 metres. The estimated
cost of the construction works and of the purchase of land for the main channel is about
1,650,000 dollars.
6. Dredging of the Navigation Channels below Liuchai.—The minimum depth of water
for the first class of shipping—i.e., vessels with the shallowest draught—is 3 metres
throughout. The raised water level of the Inner Grand Canal from Shaopai to Huaiyin
will give sufficient depth at the start, after the completion of the improvement works.
The Taiping Ho will, however, be completely dry when the Yangtse level at Sankiangyin
drops below 0.4 metre (Huai River System Datum). Consequently, the navigation
channel of the Taiping Ho from Liuchai to the Ancient Canal requires dredging. The
estimated quantity of earth to be removed is 350,000 cubic metres of dredging at 0.40 dollar
per cubic metre and 650,000 cubic metres of hand excavation at 0.17 dollar per cubic
metre. The total cost of earth removal is approximately 250,000 dollars.