Sessional_Paper_1935 — Page 155

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Between Shek Lai Pui Service Reservoir and Kowloon Point connections from the 24" Trunk main have been made to Pipers Hill and Yaumati Hill Service Reservoirs, and also directly to the Kowloon Distribution system, the object being to augment the filtered water supply from the Kowloon Waterworks at times when the capacity of its filtration plant is insufficient and when surplus water is avail- able from the Shing Mun Valley Scheme, thereby giving greater flexibility of dis- tribution of the water collected from both sources. For emergency purposes, a direct connection has also been made between the 24" Trunk main Hong Kong and the Hong Kong Distribution system in Queen's Road Central. Water from the Gardens Service Reservoir is normally drawn off by means of an 18′′ main which connects with the Hong Kong City Distribution system.

LIST OF WORKS CARRIED OUT.

The works have been carried out generally in accordance with the original proposals, modifications and extensions being made as required.

The following is a list of the works comprised in the completed scheme :--

1. Preliminary Works.

2. Resumptions.

3. Access Road from Tsun Wan to Pineapple Pass.

4. Intake Dam across the Shing Mun River and Temporary Conduit in

Shing Mun Valley.

5. North Conduit in Shing Mun Valley.

6. North Tunnel under Smugglers Ridge, South Tunnel under Golden Hill

and South Conduit connecting them.

Reception Reservoir in Lower Shek Lai Pui Valley.

7.

8.

Rapid Gravity Filtration Plant (1st Section).

9.

Shek Lai Pui Service Reservoir.

10.

24" Trunk Main Kowloon.

11. Pipers Hill Service Reservoir.

12.

Cross Harbour Pipe.

13. 24" Trunk and 18" Distribution Mains in Hong Kong.

14.

Gardens Service Reservoir.

15. Byewash Reservoir.

ALTERATIONS TO ORIGINAL PROPOSALS.

The following were the main alterations to the original proposals:

The capacity of Shek Lai Pui Service Reservoir was increased from 5 to 11.41 million gallons; the diameter of the Cross Harbour Pipe was reduced from 24" to 12.265"; the line of the 24" Trunk Main Hong Kong was changed, and the top water level of the Gardens Service Reservoir was altered from 280.00 to 240.25 above ordnance datum.

In addition to these changes the Byewash Reservoir, situated below Kowloon Reservoir, and the 18" Distribution Main from the Gardens Service Reservoir were included in this Section of the Scheme.

CONSTRUCTION.

Preliminary Works.

Preliminary investigation work was commenced in 1921. This consisted mainly of extensive surveys in the Shing Mun Valley and other areas included in the scheme and explorations of foundations.