103 (66)
Tytam Bay. A report and estimate, prepared by Mr. JAFFE and dated 6th February, 1905, were forwarded to Government, for the construction of a dam on this site, with the neces- sary contingent works. The estimate was as follows:-
Dam (to impound 1,200 million gallons),
Pumping Station, pumping plant and mains,
Tunnel for discharge of storm-water during construction of
dam and subsequently for draw-off pipes,
Road Diversion,
Temporary Works,
Total,
$2,445,000
337,000
127,000
60,000
343,300
.$3,312,300
The gauges which were fixed in 1903 in the Tytam Valley had shown however that, in years of average rainfall, the quantity of water available would be sufficient to fill a reservoir capable of containing 1,500 million gallons, though the drainage area were curtailed by constructing the dam at a higher point than that already referred to and accordingly a site which was designated "No. 3", immediately below Tytam Tuk Village, had been thoroughly investigated. To ensure the filling of such a reservoir during years of low rain- fall, a short catchwater to intercept the drainage of an important valley to the north-eastward would be constructed, thus rendering available nearly the whole of the drainage area secured by the adoption of Site No. 1. If this were found inadequate, further catch waters, which would amply ensure the filling of the proposed reservoir, could be constructed.
27
?
In other respects, the scheme was on the same lines as that. fornierly proposed and all the works, which had been carried out under the heading "Tytam Tuk Scheme, First Sec- tion (Sessional Paper No. 3 of 1994), would be fully availed of, the existing suction main being taken up and relaid as a rising main. Site No. I would still be available if it became necessary to provide further storage accommodation in the future but it would be necessary to construct an extensive system of catchwaters in order to fill such a reservoir.
In justification of the proposal to construct a dim capable of impounding 1,500 million gallons, bacteriological researches had resulted in revealing the fact that the storage of water produced a great improvement in its condition and it was therefore important that there should be ample storage.
The estimate of the amended scheme was as follows:
Dam (to impound 1,500 million gallons),
Pumping Station, pumping plant and mains, Road Diversion, etc.,
Catch water,
Total,
.$1.642,000
320,000
35,000
20,000
.$2,017,000
The Committee unanimously agreed to recommend that the amended scheme be under- taken and that it be carried out as expeditiously as possible.
W. CHATHAM,
Chairman.
Laid before the Legislative Council this 21st day of December, 1911.
R. H. CROFTON,
Clerk of Councils.