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The remaining section from Queen's Road to the Gardens Service Reservoir was completed in December, 1932, and was first utilized to pass water into the Gardens Service Reservoir on April 11th, 1933.
The main has a total length of 2,310 lineal feet and is of mild steel 24" diameter by 4" thick, the joints and other characteristics being similar to the 24" trunk main in Kowloon.
18" Distribution Main.
This main enables the water stored in the Gardens Service Reservoir to be passed into the City Distribution system. It is of Cast Iron 18" in diameter and 1,268 feet in length.
The main is connected to the draw-off pipes of the Gardens Service Reservoir and follows a direct line to the top of Zetland Street, the whole length of which it traverses before it connects to the City distribution system in Queen's Road.
Work was commenced on the laying of this main in August, 1932, and was completed during the following December.
GARDENS SERVICE RESERVOIR.
This Service Reservoir receives from the 24′′ trunk main, Hong Kong, the Shing Mun water brought over from the mainland by the Cross Harbour Pipe.
Work was commenced in September, 1931, and was sufficiently completed to allow the Reservoir to be brought into use on April 11th, 1933. The whole work, including the restoration and improvements of the Gardens, was completed in December, 1933.
The original site chosen for this reservoir was in the New Gardens on the West side of Albany Road and at a top water level of 280.00 A.O.D., but the site was changed to its present position in the old Gardens and the top water level was re- duced to 240.25 A.O.D.
The reservoir has a capacity of 4.957 million gallons and an average depth of water when full of 16′ 6′′. It is rectangular in shape, being 276′ 0′′ long by 180' 0" wide. A division wall 10′ 3′′ high divides the reservoir into two compartments, which
may be supplied or drawn from independently.
The 24" diameter Trunk main discharges into a Gauge Basin in the Inlet Control House, whence the water is directed into either half of the reservoir, as required, by means of two 24" Penstock valves.
An automatic recorder measures the amount of water entering and an indicator measures the height of water in the reservoir.
Two independent 18" diameter draw off pipes, one from each compartment of the reservoir and controlled by 15" Sluice Valves, discharge into the 18" Distribution Main to the City.
The main and division walls, which have bitumen expansion joints, are con- structed of cement concrete, generally of gravity section but reduced in thickness where the nature of the ground was suitable.
The foundations of the North wall and portions of the East and West walls were piled with reinforced concrete piles.
The invert is of cement concrete, 9′′ thick, having bitumen expansion joints.
The roof, which is of the reinforced cement concrete beam and slab type, is supported on reinforced cement concrete piers and is covered with turfed earth fill- ing 24" thick.
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