Q 62
security had not been completed by the end of the year but it was expected that this would be sufficiently advanced to enable the contract to be signed early in the following year.
$892,524.87
Expenditure
Expenditure to 31st December, 1934...$554,768.78
235. Tytam Tuk Catchwaters:-(a) Tytam Tuk East Catchwater. This work was referred to in paragraph 247 of last year's Report. Very good progress was made with the construction of the outfall tunnel under the Island Road. As explained in last year's Report it was executed by cut and cover and a serious slip occurred on December 29th. A further slip occurred on January 7th and the road was closed to lorry traffic from that date until February 11th by which time the tunnel had been constructed, refilling completed and the roadway re-instated. The construction of the catchwater was completed on 18th March, 1934. The Tytam Tuk East Catchwater apart from its own catchment area of 210 acres carries the discharge of all the other catchwaters of the Tytam Tuk Catchwater Scheme, and discharges into the Tytam Tuk Reservoir near the northern end of the dam.
The catchwater has a maximum capacity of 1,000 cusecs at a velocity of six feet per second, with a gradient of 1 in 2,120, the total length including the outfall section being 3,551 lineal feet. The invert of the catchwater and the sidewalls for a height of 1' 0" vertically above the invert, are constructed of 1.2.4 cement concrete, a semi-circular channel of eighteen inches diameter being formed in the centre line of the invert to carry the dry weather flow. As the excavations were mostly in rock below path level the sidewalls have a batter of 8 to 1 and are constructed of lime and cement concrete faced with cement mortar. At the intake end of the catchwater an intake dam was constructed composed of 1.3.5 cement concrete with displacers with a 1.2.4 cement concrete facing on the upstream face. The maximum height above foundations is thirty-three feet and the length at path level 126 feet.
The cross-section of the tunnel outfall under the Island Road is formed of three curves of different radii which give a cross-sectional area equal to that of the catchwater, the length between portals being 105.5 lineal feet. The maximum internal height and width are 15.5 and 15.64 feet respectively, the minimum thickness of the lining being eighteen inches. The lining is composed of 1.2.4 cement concrete the arched roof being reinforced with 2" diameter mild steel rods at 9" centres. A penalty of $1,500.00 was imposed on the contractor for non-completion in extended contract time.
The
236. (b) Mount Parker Catchwater:-First Section.-This work was referred to in paragraph 248 of last year's Report. A contract amounting to $94,711.60 was signed on the 26th