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5.
Additional filter beds are also urgently required and, as there is no suitable area of land available for their construction independently of the service reservoir, it is proposed to construct them on top of it. The area of the beds will be about 4,860 square yards.
6.
The existing filter beds are as follows:-
sq. yds.
Tytam Supply main beds for Central and
4,945
- do.
Eastern Districts.
subsidiary beds for
1,603
Eastern District.
-
Pokfulam Supply for Upper Levels and
1,982
Hill District, &c.
Total Square Yards
8,530
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7.
adopted, these beds are capable of filtering 3,838,500 gallons per day, when all in use, but, at the present time, it is necessary to work them at a much higher rate in order to maintain the supply of water. In a report recently made by the Government Bacteriologist on the subject of the Pokfulam water, he has called attention to the high rate of filtration at present existing and has urged that steps be taken to reduce it to between 400 and 500 gallons
par yard per day. The only means of effecting this is to construct additional filter beds and those now proposed will merely suffice
If a rate of 450 gallons per yard per day be
to meet present requirements, namely:-
S.Y. Cals.per day.Gals. per day.
Existing beds 8,530 x 400 ×
Proposed beds 4,060 x 450 =
3,838,500
2,187,000
6,025,500
Present dailyrate of consumption
8.
6,000,000
during constant supply..
To meet future requirements, it is proposed to
construct filter beds on top of the main service reservoir for the
Tytam
+