201
99. Water Supply, Kowloon.-The works described in my report of the 30th of June, 1892, 'Sessional Paper No. 1, with the addition of a reservoir at Hung Hom and a clear water tank at Yaumati, as suggested by Mr. OSBERT CHADWICK, C.M.G., to whom the project was referred, have been completed, with the exception of the Pumping Stations Buildings. These are, however, far advanced, and the laying of mains in Mongkok Tsui awaits the carrying out of the project for the continuation of Station Street, Yaumati.
100. The sources of supply are three valleys situated north of the village of Yaumati.
In these, wells have been sunk, and puddle dams constructed across their outlets to prevent the escape of subsoil waters.
101. In the valleys exists a considerable depth of sandy deposit washed down from the hills, in this are laid open jointed pipes conducting the water to the wells.
From the wells the water is conveyed by cast iron inverted syphons laid along the roads constructed in connection with this project to the clear water tank at Yaumati from which it is pumped to the reservoir on the hill north of the Rifle Range and through the distributing mains to the reservoir at Hung Hom.
102. The following particulars respecting these works will be useful for reference :-
Top water level.
Feet above Ordnance Datum.
Capacity. gallons.
Per foot.
Total.
Clear Water Tank, Yaumati,
13,540
148,000
12.5
Reservoir, Yaumati,
10,850
162,600
215.0
Reservoir, Hung Hom,
9,290
92,850
160.0
Length of rising main from Pumping Station to Yaumati reservoir 1,170 feet, diameter 7 inches.
Level of overflow,
feet above Ordnance Datum.
Level of bottom of suction pipe, feet above Orduance Datum.
Valley No. 1,
Valley No. 2,
Valley No. 3,
36.25
26.0
36.25
11.6
47.75
35.16
103. Two triple expansion surface-condensing engines and pumps have been installed in the Pumping Station at Yaumati.
These engines are of the duplicate Worthington type supplied by Messrs. SIMPSON & Co. of Pimlico; the following are the more important dimensions:-
Diameter of H. P. Cylinder,
of I. P.
"3
11
of L. P.
17
""
99
of Pump
17
6 inches.
9
""
14
17
52
,"
Duplicate Pump Displacement per inch of length of revolution 0.1688 gallons, or say 2 gallons per foot. Speed 100 feet per minute. Displacement per hour 12,000 gallons.
104. Steam is supplied by two boilers of the locomotive type manufactured by Messrs. MARSHALL & Co. of Gainsborough.
The following are the particulars of these boilers :---
Grate Area,.....
Heating Surface,
Steam Capacity, Water Capacity,
Working Pressure,................
4.597 square feet.
94,58
6.5 19.9
cube feet.
11
......100 lbs. per square inch.
105. The distributing mains have been laid throughout Yaumati, Kowloon Point and Hung Hom, and 70 fountains of the Madras pattern have been fixed. The work was sufficiently advanced to admit of water being turned on to most of the fountains on the 10th of June last, since which date the supply has been practically constant.
106. The Pumping Machinery was started on the 24th of December, and water has been delivered under pressure since that date.