81
The second source is in the Albany Nullah just below the level of Bowen Road and here it is proposed to use the water which drains into the nullah below the intake tank at the point Fon plan and also the water which is used for sand washings at the Bowen Road filter beds. The minimum available from the former source alone after allowing for a draw off of 38,000 gallons at the intake tank at F is 206,000 gallons. The former source has been checked and the returns show no diminution of flow.
At each of these 2 nullahs it is proposed that electrically driven pumps be installed to deliver, after filtration, such quantities to the high level tanks as the streams fail to supply during the dry weather period. The total available at all times in these two nul- lahs is not less than 282,000 gallons per day.
There remains the cost of the installation and the question of harbour pollution which I understand is now being reported on by the Government Analyst. As to the latter, it would appear that in the granting of water flush to a population of 19,200, the sewage discharging through the harbour frontage of about 3 miles would be considerably diluted and the increased pollution would be very small and practically negligible; about 20% of this population already possesses the flush system. As to the cost, no alterations or additions would be required to the existing sewer system and the total cost of carrying out the scheme including the necessary nullah intakes, tanks, balancing tanks, electric pumps, pump houses mains and fittings complete as shown in brown on plan would be approximately $178,500.00, details of which are given on page 19. To prevent waste I would suggest that all houses be put on water meters at a rate of say $1.00 per 1,000 gallons which no doubt all consumers would gladly pay for the privilege of the flush system. The adoption of the scheme based on a consumption of 115,000 gallons per day would give, after deducting working costs, a return to Government of about 8% on capital outlay plus maintenance and depreciation charges. All houses above the level of 50 feet below the top water levels of tanks and reservoirs shown on plan are or can be supplied from streamcourses and have been taken into account with existing services in recording the dry weather flows.
Small intake Tanks generally of about 1 day's supply, break pressure and balancing tanks would be built in the positions indicated on plan together with any minor intakes to ensure full development of the whole of the polluted catchment area on the northern slope, not used for Waterworks purposes and bounded by the spur above I.L. 2378 Pok- fulam Road, High West, Victoria Peak, Victoria Gap, Mountain View, Mount Gough, Magazine Gap and Wanchai Gap.
The pumping mains shown green on plan would be of steel 5" in diameter and the chief distributing main shown on plan by heavy brown line would be 4 inches in diame- ter and the subsidiary mains shown brown 3" galvanized.
The houses on Stubbs Road in the Wongneichong catchment area East of Mount Parish are too widely scattered to be brought into the scheme; each must be treated on its merits-in many cases water flush can only be granted subject to the owners providing 4 months capacity storage tanks, very few streams being available during the dry period.
The Ridge Broadwood Road and all houses in the vicinity up to the 400′ level can he provided for as shown on plan.
FRESH WATER SCHEME FOR MIDDLE LEVEL ZONE.
Approximate Estimates.
(4). Approximate cost of Pumps & Pump Houses,
1. at Pokfulam Road
2. at junction of Bowen Road and Garden Road
(B). 5′′ Steel Pumping Mains in duplicate,
1. at Shektongtsui 5.940 feet. } }
2. at Albany
.
8,580
$12.000.00
12,000.00
36,500.00
Carried forward
44
60,500.00
No comments yet.
Private notes are available after approval.