252
( 10 )
67. Direct connections from the upper side of the motor are made with the pump cylinders so that the "actual lift" of the pumps is reduced to the difference between the levels of the water in the reservoir into which the water is being pumped and that in the service reservoir supplying the motive
power.
68. The principal dimensions of the Hydraulic Motors are as follows:-
Garden Road,
Arbuthnot Road,
Bonham Road,
Station.
Displacement per revolution.
Diameter of Power Cylinder, Inches.
Diameter of Pump Ram,
Inches.
Length of Revolution, Inches.
Power
Cylinders,
Pumps,
gallons.
gallons.
18.5
5
20
39.0
2.8
14.0
14.0
80
89.0
9.2
80
89.0
7.0
69. The following are the principal particulars of the covered reservoirs.
Peak Road,
South of Belilios Terrace,
Above Pokfoolum Filter Beds,......
Capacity, gallons.
Depth, feet.
Level of Top Water, feet above Ordnance
Datum.
12,000
8
706
112,000
14
606
105,000
15
600
70. These works were completed in 1892 at a cost of $164,023.66.
71. Additional Service Reservoir.-Additional service reservoirs at Kennedy Town and Wanchai for equalizing the pressure and flow in the distributing mains as recommended by Mr. CHADWICK in his report of the 28th December, 1889, are now under construction.
The former having a capacity of 340,000 gallons, depth of 16 feet, top water level 210.00 feet above Ordnance Datum.
The latter having a capacity of 190,000 gallons, depth of 16 feet, top water level 251.00 feet above Ordnance Datum.
THE PEAK WATER WORKS PROJECT.
72. The rapidly increasing population of the Hill District which depended entirely on the yield of a few shallow wells for a water supply demanded attention in 1888, and previous to Mr. PRICE'S departure he submitted a proposal to pump water from the Albany service reservoir, but no definite project was put forward prior to Mr. CHADWICK's arrival in 1889.
73. Mr. CHADWICK submitted with his report, dated 30th January, 1890, a definite project for supplying the Hill District with filtered water.
74. This project involved-
(a) The pumping of water up to the Peak from the Pokfoolum service reservoir.
(b) The removal of the cast iron tanks, situated in the Glenealy Valley, previously used
for the water supply of the City but no longer required, to the Hill District.
(c) The laying of a 3-inch rising main from the Pumping Station to the Peak.
(d) The laying of distributing mains throughout the District.
75. Pumping Machinery.-During the greater part of ordinary seasons, it was considered that a sufficient supply of water from Pokfoolum would be obtained to secure the necessary hydraulic power■ for pumping the required quantity of water to the Peak. Consequently, the motor erected in the Bonham Road pumping station, referred to in paragraph 63, was designed with a view to its being used for this purpose.
76. In order to provide for the continuous supply of water to the Hill District during such periods as the Pokfoolum works fail to supply the necessary hydraulic power, a triple expansion con- densing engine of the Worthington duplex type actuating double ram pumps and supplied with steam from a vertical boiler of Beely's Field tube type, working pressure 90 lbs. per square inch, was installed in the Bonham Road Station.
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