Page 45
which were reduced from 15.5 to 13.5 hours per day, with the exception of two days at Chinese New Year. This was necessary during the summer in order to keep consumption within the limits of filtration capacity and during the winter in order to conserve supplies.
187. As a result of this the distribution system is seriously overloaded when the supply is on. Much of the system has not been improved since it was installed to meet a demand of 12 million gallons per day in 24 hours, whereas now the same mains are being called upon to distribute over 30 million gallons in only 10 hours. This implies a peak flow probably three times as much as that for which the mains were designed. Even compared with last year the average rate of distribution per hour increased by 14.3%. A start was made in the last quarter of the year on a large-scale main-laying programme designed to eliminate the bottlenecks in the distribution system.
188. With increasing consumption, it became necessary to speed up Waste Detection work and in November the first area was tested. The value of this work was soon demonstrated and by the end of the year it was estimated that a wastage of 0.856 million gallons per day had been eliminated.
189. With the delivery of more meters and in the interest of reduction of waste it was possible before the end of the year to return to universal metering, including all supplies to Government Buildings though this has not yet been in operation long enough to provide complete statistics. The total number of metered services was increased from 27,511 to 32,037 during the year.
190. Replacement of the two steam-engined pumping plants with diesel and electric-driven pumps was commenced towards the end of the year with the receipt of some of the engines and pumps from the United Kingdom.
191. An event of major importance in view of the ever-increasing amount of work being carried out in Kowloon was the completion of a new depôt in the Mongkok district of Kowloon.
192. An interesting experiment was made during the year to determine the amount of silting up of the Tytam Reservoir. The contours of the reservoir were plotted from soundings and an evaluation of the amount of silt showed it to amount to only about 5% of the total capacity. Unfortunately as no original contours are available, the calculations are based on the capacity table for the reservoir and no more detailed analysis is possible. As this is the uppermost reservoir in the Tytam Valley and nearly seventy years old the result is considered very satisfactory. A similar survey on the Kowloon Reservoir was also commenced.
31
A
Page 46
*Page 45
which were reduced from 15.5 to 13.5 hours per day, with the exception of two days at Chinese New Year. This was necessary during the summer in order to keep consumption within the limits of filtration capacity and during the winter in order to conserve supplies.
187. As a result of this the distribution system is seriously overloaded when the supply is on. Much of the system has not been improved since it was installed to meet a demand of 12 million gallons per day in 24 hours, whereas now the same mains are being called upon to distribute over 30 million gallons in only 10 hours. This implies a peak flow probably three times as much as that for which the mains were designed. Even compared with last year the average rate of distribution per hour increased by 14.3%. A start was made in the last quarter of the year on a large-scale main-laying programme designed to eliminate the bottle- necks in the distribution system.
188. With increasing consumption, it became necessary to speed up Waste Detection work and in November the first area was tested. The value of this work was soon demonstrated and by the end of the year it was estimated that a wastage of 0.856 million gallons per day had been eliminated.
189. With the delivery of more meters and in the interest of reduction of waste it was possible before the end of the year to return to universal metering, including all supplies to Government Buildings though this has not yet been in operation long enough to provide complete statistics. The total number of metered services was increased from 27,511 to 32,037 during the year.
190. Replacement of the two steam-engined pumping plants with diesel and electric-driven pumps was commenced towards the end of the year with the receipt of some of the engines and pumps from the United Kingdom.
191. An event of major importance in view of the ever-increasing amount of work being carried out in Kowloon was the completion of a new depôt in the Mongkok district of Kowloon.
192. An interesting experiment was made during the year to deter- mine the amount of silting up of the Tytam Reservoir. The contours of the reservoir were plotted from soundings and an evaluation of the amount of silt showed it to amount to only about 5% of the total capacity. Unfortunately as no original contours are available, the calculations are based on the capacity table for the reservoir and no more detailed analysis is possible. As this is the uppermost reservoir in the Tytam Valley and nearly seventy years old the result is considered very satisfactory. similar survey on the Kowloon Reservoir was also commenced.
31
A
Page 45age 46
No comments yet.
Private notes are available after approval.