the city and Hill Districts, under the constant supply
has been in
1891.
1899.
1893
9,681,000 gallons
3,018,000
3,289,000
1894 (Jany. 15th)
to March 14th) (8,107,000)
cool season
It will be noted that the figures for 1894 are for the
only, which accounts for the apparent decrease in the average daily consumption.
iii. Taking the records of the last two dry
seasons
I obtain the following statistics.
Season Date that Reservoirs began to fall Date of commencement of rains. Period in days Average daily consumption under constant supply Total consumption at previous rate, during period Actual total consumption Deficit 1892-3 Dec:7 Apr 28 202 2,900,000 585,800,000 522,881,000 62,919,000 1893-4 Nov. 1 May 16 196 3,200,000 627,200,000 538,500,000 68,700,000 Average 199 3,091Average rainfall for this period (approximately) during the last 30 years - 15.
Rainfall during dry season 9.275
1892-3 4.805 1893-4 ...The deficit represents the additional quantity of water necessary in order to give a constant supply to the city during the dry season and may be set down at 70,000,000 gallons.
I would call attention to the exceptionally low rainfall during the last dry season; it is one of the lowest on record being 1/3 only of the average. The evaporation during the last four months of the dry season averaged 1/8 inch per day.
The Tytam Dam was originally designed so that the height might be increased by 10.0 ft when the necessity arose; this will add about 90,000,000 gallons to the storage.