Dam No. 2,
Pincapple Pass Catch- water
Dam No. 2 A
Dams Nos. 3 & 4
North Conduit
Smugglers'
Ridge or
Dam No. 2, T. W. L. 560 O. D., which will have a maximun length of 440 L. Ft. and a depth to stream bed of 162 ft., will impound 900 million gallons. It will have a direct catchment area of 765 acres, but by means of catch waters running along the whole Southern face of Taimoshan and discharging through Pineapple Pass, an additional Catchment Area of 2,575 acres will be obtained. The total Catchment Area of 3,340 acres will be sufficient to fill this reservoir with 12 inches of effective rainfall.
Inside the direct Catchment Area of Dam No. 2, Dam No. 2A, 250 ft. long and 100 ft. in depth to stream bed, impounding 185 mil- lion gallons, will be constructed.
On the Southern Slopes of Taimoshan inside the Indirect Catch- ment Area of Dam No. 2, there are sites for two small reservoirs, Dams No. 3 & No. 4 at levels of 1,025 O. D. and 1,000 O. D. and impounding 200 million gallons and 137 million gallons respectively. These reser- voirs, as well as providing economical storage, will act as rainfall- equalising reservoirs and will allow of considerable reduction in the carrying capacity and thereby in the cost of the long catchwater dis- charging through Pineapple Pass:
From Dam No. 2 an open conduit approx. 2,800 L. Ft. long at a level of 485 A. O. D. will be constructed along the Western side of the Valley to the North Tunnel Gauge Basin.
The North Tunnel approx. 2,160 I. Ft. in length will pierce Smug- North Tunnel glers' Ridge and emerge in the valley above Gin Drinkers' Bay, dis-
charging into the South Conduit.
South Conduit
Golden Hill
or South Tunnel
Reception Reservoir
Filter Beds &. Service Reservoir
Trunk Mains
to Kowloon
The South Conduit which will be approx. 2,000 ft. in length will connect the South end of the North Tunnel and the North end of the South Tunnel.
The South Tunnel approx. 4,680 L. Ft. in length will pierce the Golden Hill and discharge into a Reception Reservoir situated in the lower Sheklaipui Valley immediately above the Filter Beds and Service Reservoir sites.
Between the Filter Beds Site and the end of the South Tunnel a Reception Reservoir will be formed with an overflow into the Proposed Kowloon Byewash Reservoir thereby making the Shing Mun water available through the existing works.
As the Shing Mun Water is of a high standard of initial purity and there is not sufficient area to install slow sand filter beds, the water will be dealt with by fast gravity or pressure filters and will discharge into a Concrete Service Reservoir of approx, 5 million gallons capacity.
Trunk mains will run by way of one of the back streets of the & Hong Kong Shamshuipo Reclamation, Coronation and Nathan Roads to Tsim Sha Tsui feeding a new Service Reservoir at Pipers' Hill on the way. From Tsim Sha Tsui the pipes will cross the Harbour to Jackson Road and then by way of Jackson Road, Parade Ground and Garden Road will reach the Public Gardens where a Service Reservoir with approx. T W.L. of 300 O. D. will be constructed. Considerable alteration will then be required in the City Distribution System.
Gravity Section of Scheme
The foregoing or Gravity section of the Scheme will give an aver- age supply of approx. 11 million gallons per day throughout the driest known period and, when this consumption is reached, the low level reservoirs will require to be put in hand.