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Dam 2A.
Catchwaters.
Filter Beds.
Dam No.2A or Needle Hill Dan. With the raising of
the Top Water Level of the Gorge Dam to about 600 A.0.D. a
large portion of the basin of Needle Hill Reservoir is
included in the Gorge Damn Reservoir.
For this reason and also owing to the fact that on
closer investigation this Site has not proved so favourable as at one time hoped for, I would recommend that this dam
be abandoned.
The catchwaters discharging through Lead Mine Pass present no particular difficulties apart from their being situated at a very high level and are therefore somewhat
inaccessible. They should be put in hand while the Reservoir
is under construction, but are not so urgent.
The filter beds will be an extension of the
existing plant and should be dealt with early. The existing plant has been designed to allow of extension when necessary.
A second pipe line should not be required until
the Reservoir is almost completed, so need not be considered
at the moment.
24" Pipe Line.
Gin Drinkers Bay Reservoir.
Shing Mun Scheme - Fifth Section. With a view to
getting some little idea of the possibilities of the Gin Drinkers Bay Reservoir Site, I have had a series of bore holes put down along the line of the Lower Dam Site, but wit very disappointing results.
The bores show that bedrock is only reached at a depth of about sixty feet, and that, over a large section
of the Dam.
The cost of a dam on this site would appear
excessive.
Borings are proceeding on the upper site which it
is hoped will prove more favourable.
It