LT'S brt
Enclosure 1.
314
C. O.
10213
REC
REC S WAY OF
CITY WATERWORKS EXTENSION,- TYTAM TUK SCHEME.- In accor-
1902. dance with the advice of Mr. 0. Chadwick, C.M.C., surveys and a. 78.
preliminary works were undertaken with a view to constructing
a storage reservoir at Tytam Tuk, from which the water could
be pumped up to the Tytam Tunnel. A site in the upper part of
the estuary was selected, where it appeared possible that a dam
with a large impounding capacity could be constructed. A number
of borings were made and three trial pits were undertaken in
order to obtain reliable information regarding the nature of
the foundation to be met with. The trial pits or wells are
constructed of brick in cement built on top of a cast iron curb
ring and are of a diameter of 5' 8" internally. The depths to
which they had been sunk at the close of the year were 32' 5",
30' 0" and 8' 0", respectively, below Ordnance Datum; no rock
had, however, been met with at these depths. Two barges, equip-
ped with boilers, steam winches, derricks, &c., were in use, the
wells being kept dry by means of a pulsometer pump or by baling,
according to circumstances. Digging was carried on by hand or
by a grab bucket operated by the steam winches, as found most
suitable. The men employed on the work suffered a good deal
from malarial fever of a severe type.
A contour survey, extending from the shores of the estuary
up to 200 feet above Ordnance Datum, was about completed and
surveys in connection with the determination of the drainage
area and diversions of roads, along which the pumping main would
be carried, were in progress.