ANNIVERSARY ADDRESS. 33 
reclaimed ; Homebush Bay, three hundred and sixty-one acres, 
partly reclaimed ; Tarban Creek, eight acres, complete ; Sewerage 
Farm, Parramatta, forty-one acres, partly reclaimed. 
Sydney Water Supply.—Following are some notes on the service 
reservoir in the Centennial Park, Sydney :—Length five hundred 
and eighteen feet, breadth three hundred and twenty feet, depth 
of water twenty-one feet ; capacity 18,000,000 gallons. Site, soft 
sandstone, much fissured and traversed by clay bands, overlain by 
blown sand. Walls, brickwork in cement mortar faced with 
double pressed bricks. Floor, concrete rendered with cement 
mortar. Roof, coke concrete, groined arches six inches thick at 
crown, supported by brick columns twenty feet by twenty feet 
apart, capped with cast iron skewbacks. As it is intended that 
the roof of this reservoir shall be used as a recreation ground, and 
will, therefore, be subjected to unequal loading, the columns will 
be connected throughout to each other, and to the walls, with 
Wrought iron tie-rods, which will be protected from rust by a thick 
asphaltic covering. The roof will be covered witha layer of sand. 
and turfed. It will be surrounded by a dwarf stone wall and 
ornamental cast iron railing with hollow cast iron pillars at 
intervals. At the centre will be a pavilion forming an entrance 
shaft and ventilation tower. The air will be taken in through 
the hollow railing pillars and escape at the central tower, causing 
@ thorough circulation throughout the reservoir. Roof lights are 
Provided for inspection and cleansing purposes. The reservoir 
will be divided by a central concrete wall, and each compartment. 
provided with inlet, outlet, and scour pipes. Alternative designs. 
Were prepared for roofing the reservoir with Monier arches, and 
with coke concrete groined arches, and when tested in the open: 
market, the latter proved the more economical. 
Bridges.—Tenders were received during 1896 for one hundred 
and forty works, comprising high and low level timber beam 
bridges, truss bridges, concrete and stone bridges, punts, and mis- 
cellaneous works, A considerable item in the expenditure of the 
Branch consists in the renewal of old timber bridges which are — 
C—May 5, 1897, ee 
