Sessional_Paper_1930 — Page 97

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By introducing one period of three hours a day of supply the City mains would re- quire to be filled only once per day instead of twice, as at present.

CONSUMPTION PARTICULARS

The following statement, based upon the figures for previous years, shewing the daily consumption in the City for July under various conditions of supply, has been pre- pared :-

No.

Supply,

Consumption mill. galls. per day.

Remarks.

1.

Constant supply in all Rider Main

districts.

12.00

2.

2 hours' supply daily in Rider Main

districts.

* 8.00

Principal mains open 24 hours daily. No tanks.

3.

Constant supply daily by street

fountains only.

7:00

4.

12 hours' supply do. do.

do. do....

4.10

5.

7 do. do. do.

3.50

Auxiliary supplies

6

5 do. do. do.

3.00

from tanks. not in- cluded.

7.

4 do. do. do.

† 2.90

*

By closing the principal mains from 6 p.m.-6 a.m. daily this figure could be reduced to 6.5 mill. galls. per day. Owing to additional fountains having been opened practically no saving has resulted by the reduction of 11⁄2 hours

per day supply.

1. Effect of Restrictions.-A constant supply to all Rider Main districts can only be given when the reservoirs are full or nearly so. It involves a consumption of 12 mil- lion gallons a day and is generally given only in the summer months of favourable years. Since 1st January, 1927, the total period of full supply has been 283 days.

2. 1st Restriction.-A 2 hours daily supply in Rider Main districts is the first re- striction following a constant supply. It involves a consumption of 8 million gallons a day, and since 1st January, 1927, has been in operation either in part or whole of the City for 390 days.

3. 2nd Restriction.-A constant supply with street fountains only in Rider Main districts giving a consumption of 7 million gallons a day. This has been in operation 178 days since 1st January, 1927. The consumption can be regulated by the number of foun- tains opened.

4. 3rd Restriction.-A. 12 hours supply with street fountains only in Rider Main districts. This restriction commenced on the 1st May, 1929.

5, 6. 7. Further restrictions of 7 hours, 5 hours and 4 hours have latterly had to be introduced with street fountains only in Rider Main districts involving consumption of 34, 3 and 2.9 million gallons a day respectively. Such restrictions, have not been neces- sary during the last 25 years.

The rainfall for the 12 months ending 30.6.29 as recorded at the Royal Obser- vatory, totalled 37.27" by far the lowest ever recorded for a continuous period of 12 months The previous lowest rainfall was in 1895 when 45.83" fell during that year. These figures speak for themselves.