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will be effected by the substitution of gravitation for
pumping. I think he has scarcely made enough provision
for the cost of filtration which is required in the case
of the gravitation supply, but not in the case of the
existing works, I do not think that it would be prudent
to dismantle the old works until the new works have been
in operation for some years, so that their actual yield will have been ascertained experimentally. It is to be
remembered that all calculations of supply are based on
the assumption that the rainfall and flow-off is identical with that which obtains in Hong Kong; an assumption that is probable, but not certain.
(10) In the description of the Reservoir, I see no mention of a bypass channel or pipe for carrying the water of the tributary streams direct to the filter beds, witnout passing through the body of the reservoir, This arrange- ment was found to be necessary in the case of the Pokfulam reservoir, and afforded the means of maintaining a supply of filtered water during heavy rain. It was found that after a flood the reservoir remained for a long time 80 turbid as to render the water unfilterable, whilst the trib- utary streams cleared rapidly after the cessation of rain.
sideration.
(11) In conclusion, I would state that, in my opinion the project is one that should be carried out at an early date. Some of the details of the design require re-con-
The principal point to be decided is the feasibility of substituting a masonry for an earthen dam, To determine this some trial pits might be sunk, both on the site of the proposed reservoir and in the body of the reservoir.
17th August 1900.
5