Sessional_Paper_1929 — Page 52

4th Section.

5th Section.

Available Supplies.

Gravity Section

Low Level Section

Gin Drinkers' Bay Reservoir

Estimated Cost

4th. Section. Access Road, Tai Wai Village to tunnel mouth, Low Level Dams Nos. 5 &6, catchwaters draining the Eastern slopes of Needle Hill and Grassy Hill, Pumping Station at Tai Wai Village and rising or pumping mains to tunnel mouth and third trunk main to Kowloon etc.

5th. Section (very doubtful). Reservoir in Gin Drinkers' Bay, pumping station and pumping mains to conduit between tunnels.

The 1st Section will produce an average of nearly three million gallons a day in the driest known years, whilst with the 2nd Section added the average available supply will rise to 7 million gallons a day.

The 3rd. Section will add another 4 million gallons a day, making 11 million gallons a day in all, which is the limit of the gravity section of the Scheme.

The 4th Section or development of the low level areas will make a further 6 million gallons a day available, or a total for the whole' scheme, both gravity and pumping, of approx. 17 million gallons per day in the driest known period.

The Gin Drinkers' Bay Reservoir is too problematical to be included in the Scheme, but, should such a Reservoir be possible, about 5 million gallons per day might be expected from it.

The foundations of the proposed dams have not yet been thor- oughly explored, so that it is impossible to give an accurate estimate of cost, but the following is a rough estimate based on current prices :-

1st. Section

2nd.

13

$3,500,000 $4,750,000

3rd. 4th.

"

$2,000,000

11

$6,500,000

Procedure

Work in hand

Lay-out Flan

$16,750,000

As prices are steadily rising, it is most probable that the above figure will be exceeded.

It is proposed to proceed with the work in the different sections as the water is required, and the First Section is now in hand.

The 1st. Section of the Access Road from Tsun Wan to Pineapple Pass about two miles in length is now under construction, while tenders have been called for the North and South Tunuels and South Conduit. Further Contracts for Pipers' Hill Service Reservoir and the Raw Water Reception Reservoir will be let before the end of the year.

The accompanying small scale General Lay-out Plan shows the General Outline of the Scheme, whilst the Consumption Graph attached indicates the abnormal rise in consumption during the last ten years.

R. M. Henderson.

A. M. Inst. C. E.

Engineer. 8. 4. 1924.