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(vii.) Main from Filter Beds to Service Reservoir.-Immediately after leaving the Filter Beds, the main enters a tunnel 802 feet long, thus avoiding a long detour round the Western end of the ridge which terminates at Lai Chi Kok. This tunnel is of the same dimensions as the one already described but, as the main portion of it has been cut through hard rock, only the ends are lined with 18" brickwork in cement. On leaving the tunnel, the main follows a track which has been cut on the hillside so as to enable it to be laid on the "hydraulic gradient" of 1 in 1,000, till the Tai Po Road is reached at a point close to the 4-mile stone. From here it is laid in the road until it reaches the meter-house at Kowloon Tong, whence it is carried direct to the Service Reservoir. Where it crosses stream beds, the main is carried by steel joists on stone piers, provision being made for its duplication when required. From the Filter Beds to the Service Reservoir the distance is 2.4 miles, of which 3,100 feet consist of 18" pipes at a gradient of 1 in 1,000 and 9,300 feet of 12" pipes having a "hydraulic gradient" of 5 in 1,000.
(viii.) Service Reservoir.—The Service Reservoir is built on the summit of a hill to the North of Kowloon Tong Village. It is circular in plan with a top diameter of 155' 0" and depth of 20' 0". The bottom and circumferential wall are of cement concrete and the roof of cement concrete vaulting supported on brick arches and stone piers. The capacity of the reservoir is 2,183,000 gallons and its top water level is 255' above Ordnance Datum.
(ix.) Main from Service Reservoir to Yaumati, etc. From the meter-house at Kowloon Tong, where the total supply is measured and recorded by a Venturi meter, a 12" main is carried along the Tai Po Road and Shanghai Street to Yaumati where it connects with the old distribution system at the Yaumati pumping station, now disused. A 6" branch main is taken off it en route and is laid generally along the boundary line of British Kowloon to Kowloon City and another branch main, 5" diameter, to Taikoktsui and Sham Shui Po. The extensions of the distribution system included an 8" main from the Yaumati Theatre along Gascoigne Road to Hunghom, the substitution of 7″ and 6″ mains for the old 4" in Canton Street, Salisbury and Chatham Roads and part of Austin Road and sundry 4" mains in various parts of the peninsula where no mains existed previously. Ball fire hydrants were fixed on the mains in all developed areas and street fountains were provided where required. The extensions and enlargements of the distribution system, etc., comprise in all 7 miles of new mains, 3 miles of substituted mains of larger diameter, 158 Fire Hydrants and 65 Street Fountains.
(x.) Miscellaneous.-This comprised the erection of 32 concrete boundary pillars on the hills to demarcate the catchment area; the construction of temporary intakes on the streams crossing the Tai Po Road to augment the supply to the peninsula while the new works were under construction; the laying of a temporary main at Yaumati for the same purpose; the cutting of a road from Cheung Sha Wan gap to the bay to give general access to the works; the erection of a temporary bamboo pier in the bay payment of the
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(vii.) Main from Filter Beds to Service Reservoir.-Immediately after leaving the Filter Beds, the main enters a tunnel 802 feet long, thus avoiding a long detour round the Western end of the ridge which terminates at Lai Chi Kok. This tunnel is of the same dimensions as the one already described but, as the main portion of it has been cut through hard rock, only the ends are lined with 18" brickwork in cement. On leaving the tunnel, the main follows a track which has been cut on the hillside so as to enable it to be laid on the "hydraulic gradient" of 1 in 1,000, till the Tai Po Road is reached at a point close to the 4-mile stone. From here it is laid in the road until it reaches the meter-house at Kowloon Tong, whence it is carried direct to the Service Reservoir. Where it crosses stream beds, the main is carried by steel joists on stone piers, provision being made for its duplication when required. From the Filter Beds to the Service Reservoir the distance is 24 miles, of which 3,100 feet consist of 18" pipes at a gradient of 1 in 1,000 and 9,300 feet of 12" pipes having a "hydraulic gradient" of 5 in 1,000.
(viii.) Service Reservoir.—The Service Reservoir is built on the summit of a hill to the North of Kowloon Tong Village. It is cir- cular in plan with a top diameter of 155' 0" and depth of 20' 0" The bottom and circumferential wall are of cement concrete and the roof of cement concrete vaulting supported on brick arches and stone piers. The capacity of the reservoir is 2,183,000 gallons and its top water level is 255' above Ordnance Datum.
(ix.) Main from Service Reservoir to Yaumati, etc. From the meter-house at Kowloon Tong, where the total supply is measured and recorded by a Venturi meter, a 12" main is carried along the Tai Po Road and Shanghai Street to Yaumati where it connects with the old distribution system at the Yaumati pumping station, now disused. A 6" branch main is taken off it en route and is laid generally along the boundary line of British Kowloon to Kow- loon City and another branch main, 5" diameter, to Taikoktsui and Sham Shui Po. The extensions of the distribution system included an 8" main from the Yaumati Theatre along Gascoigne Road to Hunghom, the substitution of 7′′ and 6′′ mains for the old 4" in Canton Street, Salisbury and Chatham Roads and part of Austin Road and sundry 4" mains in various parts of the peninsula where no mains existed previously. Ball fire hydrants were fixed on the mains in all developed areas and street fountains were provided where required. The extensions and enlargements of the distribu- tion system, etc., comprise in all 7 miles of new mains, 3 miles of substituted mains of larger diameter, 158 Fire Hydrants and 65 Street Fountains.
(x.) Miscellaneous.-This comprised the erection of 32 concrete boundary pillars on the hills to demarcate the catchment area ; the construction of temporary intakes on the streams crossing the Tai Po Road to augment the supply to the peninsula while the new works were under construction; the laying of a temporary main at Yaumati for the same purpose; the cutting of a road from Cheung Sha Wan gap to the bay to give general access to the works; the erection of a temporary bamboo pier in the bay payment of the
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