The total quantity of water stored in the impounding reservoirs on 1st January amounted to 1,815.55 million gallons, of which 519.59 million gallons were in the gravitation reservoirs and 1,295.96 million gallons in the lower-level reservoirs requiring pumping. Storage reached a minimum on the 24th May when the total was 687.90 million gallons, 213.64 million gallons being in the gravitation reservoirs.
The reservoirs were at or over their permanent overflow levels for the following periods:-
Reservoirs Capacity to permanent overflow level (million gallons) Overflow periods Tytam 384.80 85 days from 28th June-14th October Tytam Byewash 22.40 58 days from 27th June-3rd October Tytam Intermediate 195.90 164 days from 23rd June-3rd December Tytam Tuk 1,419.00 83 days from 22nd July-12th October Wongneichong 30.34 28 days from 23rd June-5th October Pokfulam 66.00 55 days from 22nd June-5th October Aberdeen Lower 173.23 67 days from 23rd June-5th October Aberdeen Upper 106.89* 76 days from 24th July-10th October*Revised capacity after excavation.
The reservoirs contained their combined maximum storage on eighteen days between 24th July and 3rd October.
The rainfall for the year (see Table XI) amounted to 97.67 inches, being 35.32 inches more than last year and 12.27 inches above the average for the last fifty-one years. Rainfall distribution during the year was rather poor, however, as 68.90 inches fell in the four months June-September when the loss by overflow was unusually high.
During the year 125.41 million gallons from the Pokfulam Reservoir were delivered to the Albany Filter Beds thereby conserving the supply from Tytam and making better distribution possible.
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The total quantity of water stored in the impounding reservoirs on 1st January amounted to 1,815.55 million gallons. of which 519.59 million gallons were in the gravitation reser- voirs and 1,295.96 million gallons in the lower-level reservoirs requiring pumping. Storage reached a minimum on the 24th May when the total was 687.90 million gallons, 213.64 million gallons being in the gravitation reservoirs.
The reservoirs were at or over their permanent overflow levels for the following periods:-
Reservoirs.
Capacity to perman- }
ent overflow level (million gallons).
Tytam
384.80
Tytam Byewash
22.40
Tytam Intermediate
195.90
Tytam Tuk
Wongneichong
Pokfulam
1,419.00
30.34
66.00
173.23
Aberdeen Lower
..
106.89*
Aberdeen Upper
Overflow periods.
85 days from 28th June-14th October. 58 days from 27th
June-3rd October. 164 days from 23rd June-3rd Decem-
ber.
83 days from 22nd July-12th October. 28 days from 23rd
June-5th October. 55 days from 22nd
June-5th October. 67 days from 23rd
June-5th October. 76 days from 24th July-10th October.
*Revised capacity after excavation.
The reservoirs contained their combined maximum storage on eighteen days between 24th July and 3rd October.
The rainfall for the year (see Table XI) amounted to 97.67 inches, being 35.32 inches more than last year and 12.27 inches above the average for the last fifty-one years. Rainfall distri- bution during the year was rather poor, however, as 68.90 inches fell in the four months June-September when the loss by overflow was unusually high.
During the year 125.41 million gallons from the Pokfulum Reservoir were delivered to the Albany Filter Beds thereby con- serving the supply from Tytam and making better distribution possible.
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