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Health Ordinance of 1887. The ultimate decision of the Government with respect to the scheme of main-drainage now proposed does not in any way affect the ques- tion of house-drainage.
DISPOSAL.
If the present Combined System of main drainage be left undisturbed the large volume to be dealt with during heavy rains will necessitate several points of dis- charge along the Praya, and the expense of carrying out large sewers to low water will be found very great compared with the expense attendant on the smaller pipe sewers under the Separate System. Besides, large sewer-extensions beyond the sea-wall would be an obstruction that will interfere with native shipping.
By the light of the float experiments I have made, and judging from the present condition of the Praya foreshore I cannot favourably view the disposal of sewage along the foreshore from a number of outlets along the Praya frontage. I repeat I consider the out-falls to the east and west of the city which I have recommended, i.e. North Point and Belcher's Point will in no way prove objectionable if the Separate System is adopted, and further I am satisfied that in the Western District the whole of the sewage south of Caine Road and west of the West Terrace may be com- pletely intercepted and carried to the out-fall without the need of any connection with the sewers of the rest of the city. Another intercepting artery can be carried along a portion of Hollywood Road, and so avoid to some extent the laying of large sewers, (in which it is difficult to effect satisfactory disconnexion), up steep gradients to carry off the sewage of the higher levels.
I am of opinion that the Separate System of sewerage for the city of Victoria presents no serious engineering difficulties and that it is unquestionably the one best adapted to meet the sanitary requirements of the community.
ESTIMATES OF COST.
The following is a tabular statement of the estimated cost of the works :—
Main No. 1 and branch sewers,..............
......$ 19,660.00
105,320.00
Main No. 2
}}
Main No. 3
23
Main No. 4
33
34,590.00
40,740.00
$ 200,310.00
29,690.00
Add 15 per cent for contingencies,
TOTAL,$ 230,000.00
The subsequent continuation of Main No. 4 to North Point and the installation of Pumping Machinery in duplicate at North Point I estimate at a further sum of $113,000, making the total estimate $343,000.
FINANCIAL.
The construction of these works will probably occupy a period of from three to four years, but considering the benefit that future generations will derive from them it seems reasonable that the burthen of their cost should be spread over a longer period.
I do not anticipate that any extensions or additions to the Project, at least any extensions of importance would be necessary before the year 1901, and I therefore think the payment for the cost might be extended at least over twelve years, and
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