ANNIVERSARY ADDRESS. 49 
lated. In the eastern suburbs a branch from the main Bondi 
sewer to Elizabeth Bay and Potts’ Point was finished, which with 
the Victoria-street branch already constructed, will completely 
drain that locality. 
Of the contracts in progress the most important are the two 
embracing the tunnels and aqueducts on the main western outfall 
sewer to the sewage farm at Botany ; these form the key to the 
whole western drainage ; they extend from the farm to the pen- 
stock chamber at the Warren, where the western, northern, and 
eastern branches unite, a distance of 90°6 chains. The sewer will 
be carried by three circular ducts, each six feet in diameter, and 
will cross three valleys on brick arches, and two iron and steel 
bridges.span the Woolli Creek and Cook’s River respectively. In 
the eastern suburbs, the first contract of the Waverley and 
Woollahra branch sewer is practically completed ; 1t extends from 
the Bondi sewer to the end of Denison-street Randwick, and will 
drain the western slopes of that borough. Its extension to the 
Randwick race-course and the Kensington Hstate is contemplated. 
The Darling Point branch from the main Bondi sewer has also 
been undertaken, and its construction is well advanced. In view 
of the fact that the sewerage system would necessarily take some 
years to complete, it was resolved to at once construct a system 
of storm water channels supplementary to the scheme, which 
would in the mean time serve to reduce to a minimum the nuisance 
arising from the discharge of house slops and defiled water into. 
the street gutters, besides expeditiously carrying off flood waters. 
The Iron Cove and Long Cove Creeks on the northern slopes, and 
several areas on the southern slopes subject to sudden flood, have 
been dealt with during the year. At the end of 1892 eleven 
miles seventy-four and a half chains of these channels had been 
constructed or were in progress, the length completed during the 
year being three miles twenty-one chains. 
Irrigation and Water Conservation.—The importance of the 
part which water conservation and irrigation must hold in the 
development of the Colony, has long been universally admitted.. 
D—May 3, 1893. 
