CO129-533-4 Hong Kong Water Supply Scheme 28-1-1931 - 20-1-1932 — Page 82

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utmost development of the high level sources.

The total

direct and indirect catchment area of the gravitation portion of Mr. Henderson's scheme amounts to some 6,150 acres: the

scheme we recommend has a corresponding figure of 9,000 acres

with a possibility of bringing in a further 1,300 acres.

As the necessity arises, a catchwater running along

the southerly flank of the Tai Mo Shan Range at a level of

about 700 above datum, could be constructed to deliver water

into the Shing Mun Reservoir at Pineapple Pass.

This catchwater would drain some 2,800 acres and

add about 4 M.G.D. to the yield of the scheme.

A subsequent development would be to lead into the

reservoir by catchwater the run-off from some 60 acres lying above the 700 contour and to the east of the reservoir, with

the consequent addition of about 1 M.G.D.

The penultimate development would be to run a

catchwater along the northern flank of the Tai No Shan and

also the northern and eastern slopes of Grassy and Needle Hills, which form the north-easterly boundary of the reservoir basin, at a level of 1,000, and to bring this into the

reservoir basin by a tunnel under Lead Mine Pass at a level of 650 feet. This catchwater would drain about 2,700 acres and add about 31 M.G.D. to the yield of the reservoir.

We have recommended the tunnel under Lead Mine Pass

to be driven to a mean level of 670, so that if still further

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