311
can,
except in very dry years, be counted on for filling the reservoir and so for providing rather over 5 million gallons
a day during the seven dry months of October to April inclusive. In wet years Mr. Chatham's assumption, as reported to you by Sir Henry Blake, that the rainfall would fill this reservoir as well as the one for 194 million gallons now under construc- tion, which draws from part of the same collecting area, may
be justified,
42577
03
Mr. Chadwick in paragraph 9 of his report
above referred to, putting the gathering ground, including catches, of the old Tytan Reservoir at 1,093 acres and its capacity at 406 million gallons, and estimating the gathering ground for the low level reservoir at 1,107 acres thought it could safely be asserted that the latter would yield at least
the same amount as the former that is two million gallons per
diem for the dry months. He considered also that by providing
a greater storage in proportion to collecting area than had
been furnished in the case of the old reservoir the supply
could be materially increased. It will be seen from Mr. Jaffe's
report that a very much greater yield is anticipated from the
present scheme and that the catchment area and not the reser-
voir capacity is its limiting factor.
5.
Mr. Chatham in his report of the 17th.
October, 1903, enclosed in Sir Henry Blake's Despatch above
referred to, stated that the supply rendered available by the
then existing works in the Island of Hongkong for tiding over
the dry season was 741 million gallons or, exclusive of the
yield of streams, 541 million gallons. With the additional
1,200 million gallons storage now proposed the supply, not
counting